Cache Partitioning User s Manual

Transcription

1 NEC Storage Software Cache Partitioning User s Manual IS038-10E

2 NEC Corporation No part of the contents of this book may be reproduced or transmitted in any form without permission of NEC Corporation. The contents of this book may be modified without notice in the future.

3 Preface This manual describes functions and operations of the Cache Partitioning function installed. Cache Partitioning operations are performed mainly by using the GUI (Graphical User Interface) on NEC Storage Manager clients. This manual is intended for readers who already possess the professional knowledge about the NEC Storage series disk array subsystem. Refer to the manual of the NEC Storage series disk array subsystem for information on its functions. Refer to the NEC Storage Software Manual Guide (IS901) for the overview of NEC Storage and the related manuals. Remarks 1. This manual explains functions implemented by the following program products: NEC Storage Manager and NEC Storage BaseProduct NEC Storage CachePartitioning 2. This manual is applicable to the program products of the following versions: NEC Storage Manager Ver6.2 NEC Storage BaseProduct Ver The NEC Storage Manager is referred to as ism or Storage Manager in this manual unless clearly specified. Also, the following terms refer to the corresponding NEC Storage software products. Term NEC Storage Software Product CachePartitioning NEC Storage CachePartitioning AccessControl NEC Storage AccessControl ControlCommand NEC Storage ControlCommand (Note) DynamicDataReplication NEC Storage DynamicDataReplication DynamicSnapVolume NEC Storage DynamicSnapVolume PerformanceMonitor NEC Storage PerformanceMonitor PerformanceNavigator NEC Storage PerformanceNavigator PerformanceOptimizer NEC Storage PerformanceOptimizer ReallocationControl NEC Storage ReallocationControl RemoteDataReplication NEC Storage RemoteDataReplication VolumeProtect NEC Storage VolumeProtect Note: NEC Storage ControlCommand is a program product that has integrated the following five functions. ReplicationControl SnapControl ReplicationControl/DisasterRecovery ProtectControl PowerControl

4 4. The NEC Storage series disk array subsystem is referred to as a disk array in this manual unless clearly specified. Also, the following terms refer to the corresponding NEC Storage hardware products. Term NEC Storage Hardware Product Sxxx or Sxxxx * xxx and xxxx represent the model number. NEC Storage Sxxx or NEC Storage Sxxxx 5. The following terms in this manual refer to the NEC Storage software manuals. Term NEC Storage Software Manual User's Manual (UNIX) User's Manual Performance Monitoring User's Manual Performance Analysis User s Manual 6. Trademarks and registered trademarks NEC Storage Software NEC Storage Manager User's Manual (UNIX) (IS001) NEC Storage Software NEC Storage Manager User's Manual (IS004) NEC Storage Software Performance Monitoring User's Manual (IS025) NEC Storage Software Performance Analysis User's Manual (IS029) Microsoft, Windows, Windows Server, and Windows Vista are trademarks or registered trademarks of Microsoft Corporation in the United States and other countries. UNIX is a registered trademark of The Open Group in the United States and other countries. Other product names and company names, etc. are trademarks or registered trademarks of the associated companies. 7. This product includes the OSSs below. For details on the licenses, refer to Appendix B in this manual. Apache log4j ( flex ( OpenSSL ( 8. In this document, the capacity is calculated based on units of 1024 (for example 1 KB = 1024 bytes) unless otherwise specified. 9. In this document, matters to which careful attention needs to be paid will be described as follows: Be sure to observe the instructions. If the indications are ignored and the system is improperly operated, settings which have been already made might be affected. Type of Indication Type Description Describes contents which require users to pay special attention for operation. Describes information about restrictions on operation. 1st Edition in November th Edition in January 2010

5 Contents Chapter 1 Overview of Cache Partitioning Cache Partitioning Operation Examples of Cache Partitioning Operation in Which a Cache Segment Is Exclusively Allocated to Each Operation Operation in Which a Cache Segment Is Shared by Multiple Operations Operation in Which a Cache Segment Is Allocated to a Specific Operation...5 Chapter 2 Functions of Cache Partitioning Cache Segment Cache Partitioning Cache Segment Performance Monitoring...12 Chapter 3 Cache Partitioning Installation System Configuration Cache Partitioning Installation...13 Chapter 4 How to Operate Cache Partitioning Cache Partitioning Operation Setting Cache Segment Assigning/Freeing a Logical Disk Starting/Stopping Cache Partitioning Function Description of Setting Cache Segment/Operation Screen [Cache Partitioning] Tab Screen Setting Cache Segment Screen State Cache Segment Screen Assignment/Freeing Logical Disk Screen [Setting/Reference] Tab Screen...50 Chapter 5 Cache Partitioning Operation Cache Segment Setting for the First Time after Installation Cache Segment Setting When Changing the Logical Disk Configuration Cache Segment Setting When the Cache Memory Has Been Expanded...55 Appendix A Points to Note...57 A.1 Specifications for Cache Partitioning Function...57 A.2 Points to Note When Using Cache Resident Disk...57 Appendix B License...58 B.1 Apache log4j License...58 B.2 Flex License...64 B.3 OpenSSL License...65 Index...69 i

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7 Chapter 1 Overview of Cache Partitioning Chapter 1 Overview of Cache Partitioning 1..1 Cache Partiitiioniing The cache partitioning function divides the cache memory into multiple segments (cache segments) and limits the cache memory occupancy amount for each logical disk assigned to an application. By limiting the cache memory occupancy amount, the function prevents an increase in the I/O area for one operation from affecting other operations, thus ensuring stable performance for each operation. Online Operation Batch Operation Backup Operation Development Operation Adding a New Operation Causes No Effect Cache Memory Online Operation Secure Stable Performance for Main Operations Batch Operation Backup Operation Development Operation Expand I/O Area without Any Adverse Effect Unused Area Increase Data Amount Figure 1-1 Overview and Benefits of the Cache Partitioning Function The use of the cache partitioning function offers the following benefits: Stable performance for operations can be secured. The adverse effects of other operations (batch, backup, development, etc.) on the online and other main operations can be prevented, securing stable performance for the main operation. In addition, new operations can be added without affecting the performance of ongoing operations. 1

8 Chapter 1 Overview of Cache Partitioning Optimum cache memory allocation can be achieved based on the access load condition. Maximum performance can be achieved during the time zone when the high load condition occurs for each operation, and the minimum required processing performance can be secured during the time zone when the low load condition occurs Operatiion Examplles of Cache Partiitiioniing The use of the cache partitioning function enables the cache memory to be used efficiently based on the system's characteristics and usage, ensuring the stable operation of the entire system including the disk array. This section shows operation examples in which the cache partitioning function is used Operattiion iin Whiich a Cache Segmentt IIs Excllusiivelly Allllocatted tto Each Operattiion When a cache segment of a given amount is allocated to each operation, the following benefits are offered: Stable performance for the main operations can be secured. The adverse effects of other operations (batch, backup, development, etc.) on the online and other main operations can be prevented, securing stable performance for the main operations. Adverse effects on the existing operations resulting from the addition of a new operation (server) can be prevented. When a new operation or server is added, adverse effect on the existing operations can be prevented by expanding the cache memory and allocating an additional cache segment to the new operation. Also, it is possible to intentionally reserve part of the cache memory as an unused area and to allocate that reserved area to a new operation. 2

9 Chapter 1 Overview of Cache Partitioning Figure 1-2 shows the image of the operation in which a cache segment is exclusively allocated to each operation. Online Operation Batch Operation Backup Operation Development Operation New Operation Online Operation Batch Operation Backup Operation Development Operation Unused Area Cache Memory Cache segment Allocate as many cache segments as the number of operations. Logical disk assign Allocated cache segment capacity Assign logical disk space for each logical disk unit used by each individual operation. Allocate a fixed cache segment having the capacity required by each individual operation. Figure 1-2 Operation Example 1 (Cache Segment is Exclusively Allocated to Each Operation) 3

10 Chapter 1 Overview of Cache Partitioning Operattiion iin Whiich a Cache Segmentt IIs Shared by Mullttiiplle Operattiions When a cache segment is shared by multiple operations, the following benefit is offered: Optimum cache memory allocation based on the access load condition If the per-operation access load varies depending on the time zone, this operation enables the maximum performance to be achieved during the time zone when the high load condition occurs for the operation. The disk array monitors the frequency of access on per cache segment basis and changes the allocated cache memory capacity dynamically. It is possible to allocate cache memory preferentially to the online operation during the daytime operation and to the backup and other operations during the nighttime. Also, the minimum required processing performance can always be secured by setting the minimum allocated capacity (minimum capacity). Figure 1-3 shows the image of the operation in which a cache segment is shared by multiple operations. Online Operation Backup Operation Minimum Capacity for Operation 1 High Load Condition for Operation 1 Minimum Capacity for Operation 2 Area for Operation 1 Shared Area Area for Operation 2 High Load Condition for Operation 2 Cache Memory Cache segment Allocate as many cache segments as the number of operations. Logical disk assign Allocated cache segment capacity Assign logical disk space for each logical disk unit used by each individual operation. Allocate the minimum capacity required by each operation and the maximum capacity available. Figure 1-3 Operation Example 2 (Cache Segment is Shared by Multiple Operations) 4

11 Chapter 1 Overview of Cache Partitioning Operattiion iin Whiich a Cache Segmentt IIs Allllocatted tto a Speciiffiic Operattiion When a cache segment is allocated to a specific operation for which stable performance needs to be maintained, the following benefits are offered: Stable performance can be secured for a specific operation. By allocating a cache segment to a specific operation, a given amount of cache memory is secured, regardless of the access loads of the other logical disks. Cache allocation to other operations can be optimized within the disk array. The logical disks used by the operations other than the specific operation to which the cache segment is allocated use cache memory within the range available in the disk array. 5

12 Chapter 1 Overview of Cache Partitioning Figure 1-4 shows the image of the operation in which a cache segment is allocated to a specific operation. Online Operation Batch Operation Development Operation Area for the Main Operations Area for the Development Operation Cache Memory Cache segment Divide the cache memory into two cache segments. Logical disk assign Allocated cache segment capacity Assign the logical disks used for the development operation to the development operation area. Allocate the minimum capacity required by the development operation and the maximum capacity available. Figure 1-4 Operation Example 3 (Cache Segment is Allocated to a Specific Operation) 6

13 Chapter 2 Functions of Cache Partitioning Chapter 2 Functions of Cache Partitioning 2..1 Cache Segment This section describes the basic concept of cache segment setting and the terms used in association with it. Figure 2-1 shows a conceptual diagram of cache segment setting. Cache Memory Minimum = Maximum Minimum = Maximum Minimum Segment Definition Maximum 10 GB Cache Segment (Default Segment) 5 GB Cache Segment 5 GB Cache Segment 10 GB Segment Deletion Cache Segment Assign of Logical Disk Freeing of Logical Disk Figure 2-1 Basic Concept of Cache Segment Setting (1) Cache segment The cache segment refers to the unit of cache memory area in the disk array segmented by the cache partitioning function. (2) Cache segment definition/deletion The operation to define a new cache segment is called cache segment definition, and the operation to delete a defined cache segment is called cache segment deletion. 7

14 Chapter 2 Functions of Cache Partitioning (3) Cache segment number/cache segment name A number and a nickname can be assigned to a cache segment to facilitate its management. This number is called the cache segment number and the nickname is called the cache segment name. A cache segment can be identified by a cache segment number, which is an identifier, and a cache segment name. The naming rules for the cache segment name are as follows: Specifiable characters Upper- and lower-case alphabetic letters, numbers, slash (/), and underbar (_) can be specified. Maximum number of characters Up to 16 characters can be specified. Recommended setting It is recommended to set a name that readily identifies the operation corresponding to the cache segment. (4) Default segment The cache segment having the smallest cache segment number (= 00h) is called the default segment. The default segment differs from other cache segments in the following respects: The default segment is always defined as soon as the cache partitioning function is started. The default segment cannot be deleted. When a cache segment to which a logical disk is assigned is deleted, the logical disk assigned to that deleted cache segment is allocated to the default segment. (5) Allocated cache segment capacity It is possible to specify the capacity of cache memory that can be used to define cache segments, so as to prevent cache memory from being defined in excess of the specified capacity. This specified capacity is called the allocated cache memory capacity. The allocated cache memory capacity is determined based on the logical disk capacity ratio while taking into account the priority of access to the logical disks. The logical disk capacity ratio means the ratio of the total logical disk capacity allocated to cache segments to the total logical disk capacity of the entire disk array. The specifiable allocated cache memory capacity starts at 1 GB; the value can be specified in steps of 0.25 GB. 8

15 Chapter 2 Functions of Cache Partitioning (6) Minimum capacity and maximum capacity There are the minimum allocated cache segment capacity and the maximum allocated cache segment capacity. Minimum capacity (minimum) This is the minimum capacity to be allocated to the cache segment. The specifiable range is as follows: Minimum value: 1 GB Maximum value: (Total cache memory capacity that can be allocated) (total of the minimum capacity values of all cache segments) (capacity difference of the cache segment for which the different between the minimum and maximum capacity values is largest) Maximum capacity (maximum) This is the maximum capacity that can be used as cache segments. The specifiable range is as follows: Minimum value: 1 GB Maximum value: (Total cache memory capacity that can be allocated) (total of the minimum capacity values of all cache segments) (7) Allocation of fixed cache capacity and allocation of variable cache capacity This defines the policy for setting the cache segment capacity to be allocated. Allocation of fixed cache capacity This method sets the cache segment capacity to be allocated, so that that the minimum capacity is equal to the maximum capacity. A given amount of cache memory is constantly allocated to each operation, thus preventing adverse effects of the other operations. Examples of the allocation of fixed cache capacity are given in operation examples 1 and 3 in 1.2 Operation Examples of Cache Partitioning. Allocation of variable cache capacity This method sets the cache segment capacity to be allocated, so that that the minimum capacity is smaller than the maximum capacity. If the per-operation access load varies depending on the time zone, it enables the maximum performance to be achieved during the time zone when the high load condition occurs for the operation. An example of the allocation of variable cache capacity is given in operation example 2 in 1.2 Operation Examples of Cache Partitioning. (8) Logical disk assignment/logical disk freeing The operation to register a logical disk in a cache segment is called logical disk assignment. The operation to free an assigned logical disk from a cache segment is called logical disk freeing. The freed logical disk is assigned to the default segment. 9

16 Chapter 2 Functions of Cache Partitioning (9) Start of cache partitioning function and stop of cache partitioning function To install and operate the cache partitioning function, the start cache partitioning function operation needs to be performed after making necessary cache segment settings. Performing this start operation makes the cache segment settings effective, thus limiting the use of cache memory based on the settings at the time of logical disk access. When using the cache partitioning function for the first time after installation, note that the cache segment settings will not be made effective unless the start operation is performed. By performing the stop cache partitioning function operation, you can make the cache segment settings invalid. Performing this stop operation invalidates the cache segment settings. The already set information is maintained until next time you perform the start cache partitioning function operation Cache Partiitiioniing For the purpose of configuration setting, several functions are provided to make cache segment settings. The cache segment settings are made using the configuration setting screen of the ism client. For details on the cache segment setting operation, refer to Chapter 4 How to Operate Cache Partitioning. (1) Cache segment definition, change, and deletion These functions create, change, and delete cache segment definitions. Cache segment definition This function creates a cache segment definition when the cache partitioning function is used for the first time after installation or when a new operation has been added. A cache segment name can be assigned. Specify the maximum capacity and minimum capacity of the cache segment. Depending on the cache segment allocation condition, the cache segment definition may need to be created after decreasing the capacity allocated to other cache segments. Change of cache segment definition This function changes a cache segment definition for a such purpose as to change the allocated cache segment capacity or the cache segment name in an operation such as changing the operation that uses the disk array, improving the performance of a specific operation, or increasing the cache memory capacity. The cache segment name can be changed. The maximum capacity and minimum capacity of the cache segment can be changed. 10

17 Chapter 2 Functions of Cache Partitioning Cache segment deletion This function deletes a cache segment in such a case as when the logical disk allocated to the cache segment is moved to another cache segment. Basically, before the cache segment is deleted, the logical disk needs to be allocated to another cache segment. If the cache segment is deleted to which a logical disk is allocated, the logical disk is allocated to the default segment. (2) Logical disk assignment and freeing This function assigns a logical disk to a cache segment in such a case as when the cache partitioning function is used for the first time after installation, when a new operation has been added, or when a new logical disk has been bound. Logical disk assignment and freeing can be performed on a peroperation (LD Set) basis, as well as on a per-logical disk basis. To perform logical disk assignment and freeing on a per-ld set basis requires the AccessControl product. (3) Start of cache partitioning function and stop of cache partitioning function These functions start and stop the cache partitioning function. When using the cache partitioning function for the first time after installation, perform the start operation after making necessary cache segment settings. Doing so makes the cache segment settings effective, thus limiting the use of cache memory based on the settings at the time of logical disk access. When starting the cache partitioning function, the following selection can be made: Start by taking over the current settings The function starts by taking over the current settings of the cache segment. Start by discarding the current settings The function starts by discarding the current settings and assuming the initialized settings (a state in which only the default segment is created, with all logical disks assigned to the default segment). To invalidate the cache segment settings temporarily, stop the cache partitioning function. Stopping the cache partitioning function invalidates the cache segment settings, thus allowing all the logical disks to access using the entire cache memory. 11

18 Chapter 2 Functions of Cache Partitioning 2..3 Cache Segment Performance Moniitoriing Tuning, intended to monitor and analyze cache segment load conditions and to optimize cache memory allocation, can be performed using the client screen of the performance monitoring function, the analysis support tool, and performance analysis function. Real-time monitoring This function provides a real-time display of the basic performance information of the cache segment on the dedicated screen. Overload monitoring By setting threshold values for the cache segment performance information, it is possible to detect and report unexpected load conditions. Post-analysis It is possible to reference the accumulated cache segment performance information and analyze it from a long-term viewpoint. The PerformanceMonitor product is required for using the performance monitoring function. For details on the performance monitoring function, refer to the Performance Monitoring User's Manual. To use the performance analysis function requires the PerformanceNavigator product. For details on the performance analysis function, refer to the Performance Analysis User's Manual. 12

19 Chapter 3 Cache Partitioning Installation Chapter 3 Cache Partitioning Installation 3..1 System Confiiguratiion Examples for system configuration when using the cache partitioning function are described below. Application Server ControlCommand Storage Manager *1 PerformanceMonitor ReallocationControl Windows LAN Windows LAN or FC Switch Disk Array Storage Control Software *1 DynamicDataReplication RemoteDataReplication DynamicSnapVolume VolumeProtect AccessControl PerformanceOptimizer CachePartitioning Client LAN Management Server *1 This product is included in BaseProduct. Figure 3-1 Examples for System Configuration When Using the Cache Partitioning Function 3..2 Cache Partiitiioniing IInstallllatiion This software is installed at the same time when installing the ism server. For information on installing and uninstalling, refer to the installation guide. You need to unlock the licenses of the CachePartitioning and required program products for the disk array to be applied when installing this function. 13

20 Chapter 4 How to Operate Cache Partitioning Chapter 4 How to Operate Cache Partitioning Procedures for displaying the Cache Partitioning screen are described below. (1) Select the disk array from the ism client s main screen and start Configuration to display Select Operation Mode dialog screen. (2) Click [Setting] or [Reference] on the Select Operation Mode dialog screen to display the Configuration Setting Menu (*1). (3) During the Setting mode, the monitoring of the selected disk array is stopped, thereby causing the disk array to enter the occupied state (*2*3). During the Reference mode, the state monitoring of the selected disk array is not stopped (the monitoring is continued). Although the disk array is not occupied, the ism server is occupied. (4) Click [Setting Cache Segment] or [Cache Segment Info.Reference] on the Select Operation Mode dialog screen to display Cache Partitioning screen. *1 At this time, even the ism server is occupied thus making it impossible to open Configuration Setting Menu screen from other clients connected to this server. On the other hand, if the ism server has already been occupied, it fails to display the Configuration Setting Menu screen. *2 If the disk array is occupied, it is no more possible to make settings by using a maintenance PC, etc. *3 Occupation of the server and the disk array are cancelled simultaneously with the end of Configuration Setting. 14

21 Chapter 4 How to Operate Cache Partitioning Figure 4-1 Cache Partitioning Screen 15

22 Chapter 4 How to Operate Cache Partitioning 4..1 Cache Partiitiioniing Operatiion This section describes how to operate the individual screens that are displayed during the cache segment setting process. For the terms, refer to 2.1 Cache Segment Settttiing Cache Segmentt The operations for defining, changing, and deleting cache segments are described below. First, click the [Setting] button in the [Cache Partitioning] tab screen to invoke the Setting Cache Segment screen. Figure 4-2 [Cache Partitioning] Tab Screen Perform the following operations, as necessary, while viewing the State Cache Segment screen. 16

23 Chapter 4 How to Operate Cache Partitioning (1) Defining a cache segment The procedure for defining a new cache segment is described below. Figure 4-3 Setting Cache Segment Screen (a) Click the [New] button in the Setting Cache Segment field. The default values are displayed in the setting area of the field. (b) Change the number, Cache Segment Name, minimum capacity [GB], and maximum capacity [GB] as necessary. (c) Click the [Reflect] button. The information set in the setting area of the Setting Cache Segment field is reflected on the Cache Segment List field. The information of the newly defined cache segment is displayed in gray. To define more than one cache segment, repeat steps (a) to (c). (d) Check that the information displayed in the Cache Segment List field is correct, and then click the [OK] button. The following confirmation dialog is displayed. 17

24 Chapter 4 How to Operate Cache Partitioning Figure 4-4 Cache Segment Setting Confirmation Dialog Clicking the [OK] button in this dialog sets the information to the disk array. While the setting is in progress, the following dialog is displayed. Figure 4-5 Information Setting Progress Dialog When the setting is completed, the Setting Cache Segment screen is closed, returning to the [Cache Partitioning] tab screen. Clicking the [Cancel] button displays the following confirmation dialog. Figure 4-6 Setting Cancellation Confirmation Dialog Clicking the [OK] button in this dialog cancels the setting of the information to the disk array and the Setting Cache Segment screen is closed, returning to the [Cache Partitioning] tab screen. Clicking the [Cancel] button returns you to the Setting Cache Segment screen. 18

25 Chapter 4 How to Operate Cache Partitioning (2) Changing a cache segment The procedure for changing a cache segment is described below. Figure 4-7 Setting Cache Segment Screen (a) From the Cache Segment List field, select the cache segment you want to change. The values set for the selected cache segment are displayed in the setting area of the Setting Cache Segment field. (b) Change the Segment Name, minimum capacity [GB], and maximum capacity [GB] as necessary. (c) Click the [Reflect] button. The set information is reflected on the Cache Segment List field. The information of the changed cache segment is displayed in gray. To change more than one cache segment, repeat steps (a) to (c). (d) Check that the information displayed in the Cache Segment List field is correct, and then click the [OK] button. The following confirmation dialog is displayed. 19

26 Chapter 4 How to Operate Cache Partitioning Figure 4-8 Cache Segment Setting Confirmation Dialog Clicking the [OK] button in this dialog sets the information to the disk array. While the setting is in progress, the information setting progress dialog (Figure 4-5) is displayed. When the setting is completed, the Setting Cache Segment screen is closed, returning to the [Cache Partitioning] tab screen. Clicking the [Cancel] button displays the following confirmation dialog. Figure 4-9 Setting Cancellation Confirmation Dialog Clicking the [OK] button in this dialog cancels the setting of the information to the disk array and the Setting Cache Segment screen is closed, returning to the [Cache Partitioning] tab screen. Clicking the [Cancel] button returns you to the Setting Cache Segment screen. 20

27 Chapter 4 How to Operate Cache Partitioning (3) Deleting a cache segment The procedure for deleting a cache segment is described below. Figure 4-10 Setting Cache Segment Screen (a) From the Cache Segment List field, select the cache segment you want to delete. The values set for the selected cache segment are displayed in the setting area of the Setting Cache Segment field. (b) Click the [Delete] button. The minimum capacity [GB] and maximum capacity [GB] values for the selected cache segment are replaced with a - (hyphen). (c) Click the [Reflect] button. The information of the cache segment selected in the Cache Segment List field is displayed in gray. The values of columns other than [Number] and [Cache Segment Name] are replaced with a - (hyphen). To delete more than one cache segment, repeat steps (a) to (c). (d) Check that the information displayed in the Cache Segment List field is correct, and then click the [OK] button. The following confirmation dialog is displayed. 21

28 Chapter 4 How to Operate Cache Partitioning Figure 4-11 Cache Segment Setting Confirmation Dialog Clicking the [OK] button in this dialog sets the information to the disk array. While the setting is in progress, the information setting progress dialog (Figure 4-5) is displayed. When the setting is completed, the Setting Cache Segment screen is closed, returning to the [Cache Partitioning] tab screen. Clicking the [Cancel] button displays the following confirmation dialog. Figure 4-12 Setting Cancellation Confirmation Dialog Clicking the [OK] button in this dialog cancels the setting of the information to the disk array and the Setting Cache Segment screen is closed, returning to the [Cache Partitioning] tab screen. Clicking the [Cancel] button returns you to the Setting Cache Segment screen. 22

29 Chapter 4 How to Operate Cache Partitioning Assiigniing//Freeiing a Logiicall Diisk The operations for assigning a logical disk to a cache segment or freeing a logical disk from a cache segment are described below. (1) Assigning a logical disk The procedure for assigning a logical disk to a cache segment is described below. Figure 4-13 [Cache Partitioning] Tab Screen (a) From the tree view or list view of the Cache Segment List field, select the cache segment to which you want to assign a logical disk. (b) From the list view of the Logical Disk List field, select the logical disk you want to assign. Two or more logical disks can be selected at once by using the Ctrl key or Shift key. 23

30 Chapter 4 How to Operate Cache Partitioning (c) Click the [Assign] button. If the selected logical disk is a logical disk out of assignment, the following confirmation dialog is displayed. There may be cases where confirmation dialog [25374] is displayed. Figure 4-14 Configuration Setting Operation Guard Disk Assignment Confirmation Dialog Clicking the [OK] button in this dialog returns you to the [Cache Partitioning] tab screen. If any logical disk out of assignment is included in the selected logical disks, the following confirmation dialog is displayed. There may be cases where confirmation dialog [25552] or [25553] is displayed. Figure 4-15 Configuration Setting Operation Guard Disk Assignment Confirmation Dialog 2 24

31 Chapter 4 How to Operate Cache Partitioning Clicking the [OK] button in this dialog displays the following confirmation dialog. Figure 4-16 Logical Disk Assignment Confirmation Dialog Clicking the [OK] button in this dialog sets the information to the disk array. While the setting is in progress, the information setting progress dialog (Figure 4-5) is displayed. When the setting is completed, the logical disk assignment confirmation dialog is closed, returning to the [Cache Partitioning] tab screen. Clicking the [Cancel] button returns you to the [Cache Partitioning] tab screen without registering the setting. 25

32 Chapter 4 How to Operate Cache Partitioning (2) Freeing Logical Disk The procedure for freeing a logical disk assigned to a cache segment is described below. Figure 4-17 [Cache Partitioning] Tab Screen (a) From the list view of the [Cache Segment List] field, select the cache segment from which you want to free logical disks or the logical disk you want to free. If a cache segment is selected, all the logical disks assigned to that selected cache segment are freed. If a logical disk is selected, only that selected logical disk is freed. (b) Click the [Free] button. The selected cache segments or logical disks are only logical disks not targeted for freeing. The following confirmation dialog is displayed. 26

33 Chapter 4 How to Operate Cache Partitioning Figure 4-18 Configuration Setting Operation Guard Disk Freeing Confirmation Dialog 1 Clicking the [OK] button in this dialog returns to the [Cache Partitioning] tab screen. If the selected cache segments or logical disks contain logical disks not targeted for freeing, the following confirmation dialog is displayed. Figure 4-19 Configuration Setting Operation Guard Disk Freeing Confirmation Dialog 2 27

34 Chapter 4 How to Operate Cache Partitioning Clicking the [OK] button in this dialog displays the following confirmation dialog. Figure 4-20 Logical Disk Freeing Confirmation Dialog Clicking the [OK] button in this dialog sets the information to the disk array. While the setting is in progress, the information setting progress dialog (Figure 4-5) is displayed. When the setting is completed, the logical disk freeing confirmation dialog is closed, returning to the [Cache Partitioning] tab screen. Clicking the [Cancel] button returns you to the [Cache Partitioning] tab screen without registering the setting. 28

35 Chapter 4 How to Operate Cache Partitioning Sttarttiing//Sttoppiing Cache Parttiittiioniing Functtiion The operations for starting/stopping the cache partitioning function are described below. (1) Start of cache partitioning function The procedure for starting the cache partitioning function is described below. Figure 4-21 [Setting/Reference] Tab Screen (a) Click the [Start Cache Partitioning Function] button. The following confirmation dialog is displayed. However, if there are logical disks in locked state, [Initialization] is not activated. 29

36 Chapter 4 How to Operate Cache Partitioning Figure 4-22 Cache Partitioning Function Start Setting Dialog (b) If you select [Taking Over Setting] and click the [OK] button in this dialog, the cache partitioning function starts while taking over the current settings. If you select [Initialization] and click the [OK] button, the following confirmation dialog is displayed. Figure 4-23 Initialization Confirmation Dialog Clicking the [OK] button in this dialog causes the whole cache memory area to be allocated to the default segment, resulting in all the logical disks being assigned to the default segment. If you are using the system for the first time after installation and have not yet defined any cache segment, only the [Initialization] button is available. While the setting is in progress, the information setting progress dialog (Figure 4-5) is displayed. When the setting is completed, the cache partitioning function start setting dialog is closed, returning to the [Setting/Reference] tab screen. Clicking the [Cancel] button returns you to the [Setting/Reference] tab screen without registering the setting. 30

37 Chapter 4 How to Operate Cache Partitioning (2) Stop of cache partitioning function The procedure for stopping the cache partitioning function is described below. Figure 4-24 [Setting/Reference] Tab Screen (a) Click the [Stop Cache Partitioning Function] button. For cache segments in which logical disks in locked state exist, the following confirmation dialog is displayed. Figure 4-25 Configuration Setting Operation Guard Disk Cache Partitioning Function Stop Confirmation Dialog Clicking the [OK] button returns to the [Setting/Reference] Tab Screen. For cache segments in which logical disks in locked state do not exist, the following dialog is displayed. 31

38 Chapter 4 How to Operate Cache Partitioning Figure 4-26 Cache Partitioning Function Stop Setting Dialog (b) Clicking the [OK] button in this dialog stops the cache partitioning function. While the setting is in progress, the information setting progress dialog (Figure 4-5) is displayed. When the setting is completed, the cache partitioning function stop setting dialog is closed, returning to the [Setting/Reference] tab screen. Clicking the [Cancel] button returns you to the [Setting/Reference] tab screen without registering the setting. 32

39 Chapter 4 How to Operate Cache Partitioning 4..2 Descriiptiion of Settiing Cache Segment//Operatiion Screen The description of the operation screen explains the screens displayed for the cache partitioning function. The operation screens are organized in the structure described below. For the overall structure, refer to Figure For the terms, refer to 2.1 Cache Segment. (1) [Cache Partitioning] tab screen Displays the setting state of the cache partitioning function. (2) Setting Cache Segment screen Used to set (define, delete, and change) cache segments. (3) State Cache Segment screen Displays the cache segment partitioning state. (4) Assignment/Freeing Logical Disk screen Used to assign or free logical disks to or from cache segments. (5) [Setting/Reference] tab screen Used to start or stop the cache partitioning function. The screen also displays the CachePartitioning product information. 33

40 Chapter 4 How to Operate Cache Partitioning [When the [Cache Partitioning] tab screen is selected] (1) [Cache Partitioning] tab screen (2) Setting Cache Segment screen (3) State Cache Segment screen (4) Assignment/Freeing Logical Disk screen [When the Setting/Reference tab screen is selected] (5) [Setting/Reference] tab screen Figure 4-27 Overall Cache Parititioning Screen Structure 34

41 Chapter 4 How to Operate Cache Partitioning [[Cache Parttiittiioniing]] Tab Screen When the [Setting Cache Segment] or [Cache Segment Info.Reference] button is clicked in the configuration setting screen of the ism client, the following screen is displayed. (1) Cache Segment List Field (2) (3) Logical Disk List Field Figure 4-28 [Cache Partitioning] Tab Screen When invoked, the Cache Partitioning screen is displayed with the [Cache Partitioning] tab screen selected. The [Cache Partitioning] tab screen consists of a cache segment list field, a row of operation buttons, and a logical disk list field. (1) Cache segment list field This field consists of a tree view displaying a cache segment list and a list view displaying a list of cache segments or logical disks assigned to cache segments. (a) Tree view The tree view displays cache segment icons and icons indicating the setting state of each cache segment. Clicking of tree items displays a list of the relevant information in the list view. Cache segment icons The cache segment icon changes its shape depending on the state of the cache partitioning function. 35

42 Chapter 4 How to Operate Cache Partitioning Icon Table 4-1 Cache Segment Icons Description Indicates that the cache partitioning function has been started. The icon is followed by Cache Segment. Indicates that the cache partitioning function is stopped. The icon is followed by Cache Segment - Stop. Icons indicating the setting state of the cache segment The shape of the icon changes depending on the state of the cache partitioning function as well as on the setting state of the cache segment. The icon is followed by the cache segment name. Table 4-2 Icons Indicating the Setting State of the Cache Segment Icon Description Default segment for which the cache partitioning function has been started and the maximum and minimum allocated capacity values are set and to which a logical disk is assigned Default segment for which the cache partitioning function has been started and the maximum and minimum allocated capacity values are set but to which no logical disk is assigned Default segment for which the cache partitioning function is stopped Default segment whose set values do not match those of the system, regardless of the state of the cache partitioning function If this icon is displayed, get the disk array information (for details, refer to (4) [Get Disk Array Info.] button ). A cache segment for which this icon is displayed is not displayed in the State Cache Segment screen (for details, refer to State Cache Segment Screen ). Cache segment for which the cache partitioning function has been started and the maximum and minimum allocated capacity values are set and to which a logical disk is assigned Cache segment for which the cache partitioning function has been started and the maximum and minimum allocated capacity values are set but to which no logical disk is assigned Cache segment for which the cache partitioning function is stopped Cache segment whose set values do not match those of the system, regardless of the state of the cache partitioning function If this icon is displayed, delete the cache segment (for details, refer to Setting Cache Segment ) or get the disk array information (for details, refer to (4) [Get Disk Array Info.] button ). A cache segment for which this icon is displayed is not displayed in the State Cache Segment screen (for details, refer to State Cache Segment Screen ). 36

43 Chapter 4 How to Operate Cache Partitioning (b) List view The list view displays a list of cache segments or logical disks assigned to cache segments. The content of this view changes depending on the item selected in the tree view or list view. Clicking or doubleclicking the selected item displays a list of the relevant information in the list view. Cache segment list This list is displayed when the [Cache Partitioning] tab screen is invoked or when the cache segment icon is clicked in the tree view. The cache segment list contains the information shown in Table 4-3. Table 4-3 Items To Be Displayed in the Cache Segment List Display Item Content Number Icon indicating the setting state of the cache segment and the cache segment number Cache Segment Name Cache segment name Min [GB] Minimum capacity value of the allocated cache segment capacity Min [%] Minimum capacity ratio of the allocated cache segment capacity Max [GB] Maximum capacity value of the allocated cache segment capacity Max [%] Maximum capacity ratio of the allocated cache segment capacity LD Count Number of logical disks assigned to the cache segment Assigned Logical Disk [GB] Total capacity of the logical disks assigned to the cache segment Configuration Change of LD Locked state of the logical disks assigned to the cache segment However, for other than the disk arrays with configuration setting operation guard, this is not displayed. Allocate [GB] Present capacity assigned to the cache segment Allocate [%] Ratio of the present capacity assigned to the cache segment List of the logical disks assigned to the cache segment This list is displayed when an icon indicating the setting state of the cache segment is clicked in the tree view or when a cache segment icon is double-clicked in the list view. The list of the logical disks assigned to the cache segment contains the information shown in Table

44 Chapter 4 How to Operate Cache Partitioning Number OS Type Logical Disk Name Capacity [GB] Configuration Change LD Set Name RANK Pool Number Pool Name RAID Table 4-4 Items To Be Displayed in the Logical Disk List Display Item Content Logical disk icon and logical disk number Volume format of the logical disk Nickname of the logical disk Capacity of the logical disk Locked state of logical disks However, for other than the disk arrays with configuration setting operation guard, this is not displayed. LD Set to which the logical disk belongs This item is not displayed if AccessControl is not purchased. RANK number of the RANK to which the logical disk belongs This is displayed for other than the disk arrays with pool. Pool number of the pool to which the logical disk belongs This is displayed for the disk arrays with pool. Nickname of the pool to which the logical disk belongs This is displayed for the disk arrays with pool. RAID type of the RANK or pool to which the logical disk belongs The logical disk display item order can be changed. For information on the settings, refer to Client Start/Stop in the User s Manual or User s Manual (UNIX) in accordance with the OS in use. (2) Operation buttons Using the cache segment operation buttons, the following operations can be performed: [Setting] button: [Segment State] button: Set the cache segment settings Display the cache segment state Using the logical disk operation buttons, the following operations can be performed: [Assign] button: [Free] button: Assign logical disks to the cache segment Free logical disks from the cache segment For details on each of these buttons, refer to 4.1 Cache Partitioning Operation. 38

45 Chapter 4 How to Operate Cache Partitioning (3) Logical disk list field This field consists of a list view displaying a list of logical disks in the disk array and a combo box that can be used to select the logical disks to be displayed. (a) List view This view displays a list of the information on the logical disks in the disk array. Table 4-5 Items To Be Displayed in the Logical Disk List (1/2) Display Item Content Number Logical disk icon and logical disk number OS Type Volume format of the logical disk Logical Disk Name Nickname of the logical disk Capacity [GB] Capacity of the logical disk Cache Segment Number Cache segment number to which the logical disk is assigned Cache Segment Name Cache segment name to which the logical disk is assigned RPL Type Volume attribute of the logical disk for which a replication pair has been set Master volume: MV Replication volume: RV Used as both RV and MV: RV/MV Volume not used as a replication volume: IV Volume that cannot be used as a replication volume: This column is not displayed if neither DynamicDataReplication nor RemoteDataReplication is purchased. Snapshot Type Snapshot type of the logical disk Base-volume (copy-source volume): BV Snapshot data volume (logical disk configuring SRA): SDV If the snapshot function (DynamicSnapVolume) has not been purchased, this column is not displayed. Group Group attribute of the logical disk Preserve group: Preserve Reserve group: Reserve Assigned to the LD Set: LD Set No group: This column is not displayed if neither AccessControl nor ReallocationControl is purchased. Purpose Purpose of the logical disk Work disk for optimization: Optimization Logical disk for which a replication pair has been set: RPL Logical disk already set to BV: Snapshot Logical disk paired for replication already set to BV: RPL/snapshot Logical disk for which volume protection has been set: Data protection Logical disk which volume protection has been set for and is MV: RPL/Data protection None of the above purposes: This column is not displayed if ReallocationControl is not purchased. 39

46 Chapter 4 How to Operate Cache Partitioning Configuration Change LD Set Name RANK Pool Number Pool Name RAID Table 4-5 Items To Be Displayed in the Logical Disk List (2/2) Display Item Content Locked state of logical disks However, this column is not displayed for other than the disk arrays with configuration setting operation guard. LD Set to which the logical disk belongs This item is not displayed if AccessControl is not purchased. RANK number of the RANK to which the logical disk belongs This is displayed for other than the disk arrays with pool. Pool number of the pool to which the logical disk belongs This is displayed for the disk arrays with pool. Nickname of the pool to which the logical disk belongs This is displayed for the disk arrays with pool. RAID type of the RANK or pool to which the logical disk belongs Locked logical disks cannot be assigned to the cache segment. The logical disk display item order can be changed. For information on the settings, refer to Client Start/Stop in the User s Manual or User s Manual (UNIX) in accordance with the OS in use. 40

47 Chapter 4 How to Operate Cache Partitioning (b) Selection combo box The logical disks to be displayed in the logical disk list can be selected using the selection information shown in Table 4-6. Table 4-6 Logical Disk Display Selection Selection Information Logical Disk Display LD Set (Example: NX:UNIX_Server01 ) Cache Segment Name (Example: segment1 ) Group (Example: Preserve Group ) Group - Purpose (Example: Preserve - Purpose (RPL) ) OS Type: * (Example: NX: * ) Only the logical disks assigned to the selected LD Set are displayed. However, they are not displayed if AccessControl is not purchased. Only the logical disks assigned to the selected cache segment are displayed. Only the logical disks of the selected group are displayed. However, they are not displayed if AccessControl is not purchased. Only the logical disks belonging to the selected group and purpose are displayed. However, they are not displayed if ReallocationControl is not purchased. Only the logical disks of the selected OS Type are displayed. : * Only the logical disks whose OS Type is undefined are displayed. ALL All the logical disks in the disk array are displayed (default). (c) [All Selection] check box An auxiliary operation can be performed for the selection of logical disks to be displayed in the list view. With this check box, the following auxiliary operations are possible: Checking the box All the logical disks displayed in the logical disk list are selected. Unchecking the box The selection of the logical disks displayed and selected in the logical disk list is canceled. (4) [Get Disk Array Info.] button This button recollects from the disk array the information necessary for the operation on the cache partitioning screen. Normally, there is no need to recollect information from the disk array using the button. Use this button if any operation for the disk array goes wrong during the cache segment setting process and if it becomes impossible to proceed with the operation due to discrepancy between the information set in the system and that managed by the ism client. While the information collection, initiated by clicking this button, is in progress, the following dialog box is displayed. 41

48 Chapter 4 How to Operate Cache Partitioning Figure 4-29 [Information acquiring] Dialog When the processing is completed, the information collection progress dialog is closed, returning to the [Cache Partitioning] tab screen. If you quit collecting the information by clicking the [Cancel] button during the information collection or if the information collection ends abnormally, the disk array information managed by the ism client may be left invalid. In that case, click the [Get Disk Array Info.] button again to collect the disk array information. (5) [Close] button This button closes the [Cache Partitioning] tab screen. (6) [Help] button This button invokes the help screen. 42

49 Chapter 4 How to Operate Cache Partitioning Settttiing Cache Segmentt Screen Clicking the [Setting] button in the [Cache Partitioning] tab screen displays the following screen. (1) (2) Cache Segment List Field (3) (4) Setting Cache Segment Field Figure 4-30 Setting Cache Segment Screen The Setting Cache Segment screen consists of a cache segment list field, a setting cache segment field, and a set of operation buttons. 43

50 Chapter 4 How to Operate Cache Partitioning (1) Allocatable Cache Capacity/Maximum Segment Count/Min Capacity Range/Max Capacity Range These items display the reference values that may be used when setting the cache segments. Display Item Allocatable Cache Capacity Maximum Segment Count Min Capacity Range Max Capacity Range Table 4-7 Display Items Content Total cache memory capacity available for cache partitioning (value obtained by subtracting the capacity not to be used for cache partitioning, such as cache resident disk capacity, from the logical capacity of the cache memory) Number of cache segments that can be defined (value obtained by subtracting the number of already defined cache segments from the total number of cache segments that can be defined) Range of capacity values that can be set as the minimum capacity If there is any cache segment whose set values do not match those of the system, the capacity range cannot be calculated correctly. For any cache segment whose set values do not match those of the system, perform the cache segment deletion (for details, refer to Setting Cache Segment ). Range of capacity values that can be set as the maximum capacity If there is any cache segment whose set values do not match those of the system, the capacity range cannot be calculated correctly. For any cache segment whose set values do not match those of the system, perform the cache segment deletion (for details, refer to Setting Cache Segment ). (2) Cache segment list field This field displays the cache segment setting information in the form of a list view. Table 4-8 Items To Be Displayed in the Cache Segment List Display Item Content Number Icon indicating the setting state of the cache segment and the cache segment number Cache Segment Name Displays the cache segment name. Min [GB] Minimum capacity value of the allocated cache segment capacity Max [GB] Maximum capacity value of the allocated cache segment capacity LD Count Number of logical disks assigned to the cache segment Assigned Logical Disk [GB] Total capacity of the logical disks assigned to the cache segment Configuration Change of LD Displays locked state of logical disks assigned to the cache segment. This column is not displayed for other than the disk arrays with configuration setting operation guard. Reference Allocate [GB] Reference value of the allocated capacity calculated from the ratio of allocated logical disk capacity 44

51 Chapter 4 How to Operate Cache Partitioning (3) [Reflect] button This button reflects the information set in the setting area of the cache segment setting field on the cache segment list field. (4) Cache segment setting field (a) Setting area This area is used to edit the information set for the cache segment you want to define, change, or delete. Table 4-9 Items To Be Displayed in the Cache Segment Setting Area Display Item Content Number Cache segment number A cache segment number can be selected only when defining a new cache segment. Cache Segment Name Cache segment name Enter a name directly in this field when changing the cache segment name. Min [GB] Minimum capacity value of the allocated cache segment capacity The value can be entered directly or by using the spin button. Max [GB] Maximum capacity value of the allocated cache segment capacity The value can be entered directly or by using the spin button. (b) [New] button This button sets the default values of the cache segment in the setting area. (c) [Delete] button This button clears the information set in the setting area. (5) [OK] button This button sets the information entered in the cache segment list field. (6) [Cancel] button This button cancels the setting of the information entered in the cache segment list field. (7) [Help] button This button invokes the help screen. 45

52 Chapter 4 How to Operate Cache Partitioning Sttatte Cache Segmentt Screen Clicking the [Segment State] button in the [Cache Partitioning] tab screen displays the following screen. (1) Cache Segment State Field (2) Cache Segment Setting Information Field (3) Legend List Figure 4-31 State Cache Segment Screen The State Cache Segment screen consists of a cache segment state field, cache segment setting information field, legend list, etc. (1) Cache segment state field This field displays numerical values and a pie chart indicating the current cache segment state. Table 4-10 Items To Be Displayed in the Cache Segment State Field Display Item Content Allocated Total of the capacity allocated to each cache segment Unallocated Total of the capacity not allocated to any cache segment Pie Chart Ratio of allocated capacity and unallocated capacity for each cache segment If the cache partitioning function is stopped, Cache partitioning function is stopped is displayed. 46

53 Chapter 4 How to Operate Cache Partitioning (2) Cache segment setting information field This field displays numerical values and a bar graph indicating the cache segment setting information. Table 4-11 Items To Be Displayed in the Cache Segment Setting Information Field Display Item Content Total Min Capacity Current Segment Count Total capacity of the minimum capacity value of each cache segment Number of already set cache segments Bar Graph Values (maximum and minimum) set for each cache segment When the cache partitioning function is stopped, the bar is dotted. (3) Legend list This list contains the legends of the pie chart and bar graph. Table 4-12 Items To Be Displayed in the Legend List Display Item Content (Legend) Legends of the allocated capacity, maximum capacity, and minimum capacity of each cache segment When a cache segment is not allocated, (Unallocated) is displayed for the capacity. Number Icon indicating the setting state of the cache segment and the cache segment number Cache Segment Name Cache segment name Min [GB] Minimum capacity value of the allocated cache segment capacity Min [%] Minimum capacity ratio of the allocated cache segment capacity Max [GB] Maximum capacity value of the allocated cache segment capacity Max [%] Maximum capacity ratio of the allocated cache segment capacity Allocate [GB] Present capacity allocated to the cache segment When the cache partitioning function is stopped, a - (hyphen) is displayed. Allocate [%] Ratio of the present capacity allocated to the cache segment When the cache partitioning function is stopped, a - (hyphen) is displayed. (4) [Get Disk Array Info.] button This button updates the information on the State Cache Segment screen. The information on the State Cache Segment screen is updated when the screen is invoked or a cache segment setting operation is performed. Click this button if you want to update the information at any other time. 47

54 Chapter 4 How to Operate Cache Partitioning (5) [Close] button This button closes the State Cache Segment screen. (6) [Help] button This button invokes the help screen. Right-clicking a section of the pie chart or bar graph for a specific cache segment that is displayed on the State Cache Segment screen displays a popup menu. Clicking [Properties] in this popup menu displays the Properties dialog for the cache segment. Figure 4-32 Cache Segment Properties Dialog Table 4-13 shows the items to be displayed in the Properties dialog. Table 4-13 Items To Be Displayed in the Properties Dialog Display Item Content (Number) Cache Segment Name (Cache segment number) cache segment name Min Capacity Minimum capacity value of the allocated cache segment capacity Max Capacity Maximum capacity value of the allocated cache segment capacity Allocated Capacity Present capacity allocated to the cache segment When the cache partitioning function is stopped, a - (hyphen) is displayed. LD Count Number of logical disks assigned to the cache segment Total LD Capacity Total capacity of the logical disks assigned to the cache segment 48