NEC Storage ReplicationControl SQL Option User's Manual

Transcription

1 NEC Storage ReplicationControl SQL Option User's Manual

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 the NEC Storage ReplicationControl SQL Option. By being applied in combination with a data replication function (DynamicDataReplication or RemoteDataReplication), this product makes it possible to create a snapshot without stopping operations for the Microsoft SQL Server 2000 database constructed on the NEC Storage series. This snapshot can be used for backups and parallel processing. This enables 24-hour a day uninterrupted operation of the Microsoft SQL Server 2000 database. If an error occurs while backing up the Microsoft SQL Server 2000 database using a data replication function, this product is indispensable in recovering data up to the moment of error occurrence by applying the transaction log backup. This manual is for readers who have basic knowledge of Microsoft SQL Server 2000 as well as experience with backup recovery. The data replication functions in the NEC Storage series that are used in this manual, are explained in the NEC Storage Manager Data Replication User s Manual. For information related to Microsoft SQL Server 2000, refer to the Microsoft SQL Server 2000 Books Online. Refer to the NEC Storage Manager Manual Guide (IS901) for the overview of NEC Storage Manager 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 ReplicationControl NEC Storage ReplicationControl SQL Option NEC Storage DynamicDataReplication NEC Storage RemoteDataReplication 2. This manual is applicable to the program products of the following versions: NEC Storage Manager Ver2.1 NEC Storage BaseProduct Ver2.1 NEC Storage ReplicationControl Ver2.1 NEC Storage ReplicationControl SQL Option Ver The term ism in this text refers to as all the NEC Storage Manager program products. 4. This manual is based on the Microsoft SQL Server 2000 Enterprise Edition and the Microsoft SQL Server 2000 Standard Edition. 5. The term data replication functions used in this text refers to the functions provided by the NEC Storage DynamicDataReplication, NEC Storage RemoteDataReplication and NEC Storage ReplicationControl in the NEC Storage series. They differ from the replication functions provided by Microsoft SQL Server 2000.

4 6. The term Microsoft SQL Server 2000 in this text refers to as either Microsoft SQL Server 2000 Enterprise Edition or the Microsoft SQL Server 2000 Standard Edition. 7. The term MSCS in this text refers to the Microsoft Cluster Server. 8. Trademarks and registered trademarks Microsoft and Windows are registered trademarks or trademarks of Microsoft Corporation in the United States and other countries. VERITAS, Backup Exec, VERITAS Backup Exec, NetBackup, and VERITAS NetBackup are registered trademarks or trademarks of VERITAS Software Corporation in the United States and other countries. ARCserve is a registered trademark of Computer Associates International, Inc. in the United States. Other product names and company names, etc. are registered trademarks or trademarks of the associated companies. The First Edition in January 2002 The Fourth Edition in March 2003

5 Contents Chapter 1 Data Replication Overview Data Replication Functions by Product Data Replication Advantages Examples of Using Data Replication... 6 Chapter 2 Overview of NEC Storage ReplicationControl SQL Option Product Function Advantages of NEC Storage ReplicationControl SQL Option System Configuration Examples of Using NEC Storage ReplicationControl SQL Option Backup Parallel Processing of Search Operations Parallel Processing of Operations Accompanied by Update Chapter 3 Database System Configuration Database Configuration Data Replication System Design Application to Backup System Backup Types Concept of Parallel Processing in Other Nodes Standby Server Log Distribution Server Accompanied by Update Files Operated in Parallel Operation Automatization Chapter 4 Functions of NEC Storage ReplicationControl SQL Option Snapshot Backup Snapshot Backup Operations Snapshot Restore Operations Commands Snapshot Backup Command Snapshot Restore Command Metafile Handling Access Restriction Chapter 5 Installation and Setting of NEC Storage ReplicationControl SQL Option Operating Environment Software Installation Software Uninstallation Software Update Setting of NEC Storage ReplicationControl SQL Option Replication Volume Preparation Database Creation Volume Assignment for Metafiles Setting of Microsoft SQL Server Change of Worker Thread Maximum Number Chapter 6 Operations of NEC Storage ReplicationControl SQL Option Tape Backup Backup i

6 6.1.2 Multiple Database Backup Recovery Multiple Database Recovery Disk Backup Preparation Backup Recovery Parallel Operation on Another Node Operation as Standby Database Log Distribution Operation for Server Accompanied by Update Chapter 7 Measures for Errors Error Detection Method Errors Related to Database Configurations Errors Related to Metafile Configurations Appendix A Notes Index ii

7 Chapter 1 Data Replication Overview Chapter 1 Data Replication Overview To centrally manage the enormous amount of information accumulated by business operations and promote its effective and efficient utilization, it is necessary to have a storage system that realizes a highly advanced processing feature, large capacity memory and high reliability. The purpose of the data replication function is to effectively operate this storage system Data Replliicatiion Data replication, which is a function that creates a Replication Volume (RV) for a Business Volume (MV: Master Volume), is stored in the disk array. The RV can achieve synchronization and segregation from the MV at an arbitrary time. When synchronized, the MV and RV coincide with each other in terms of their contents; thus, update the MV is instantly reflected in the RV. Through segregation at an arbitrary time, the MV data can be kept in the RV. By using this RV, backup and searches can be performed in parallel with on-line services, thus making it possible to increase online operation time. Business Server Master operations (Online) Parallel processing (Backup/Search) Synchronization / Segregation operations Master Volume (MV) Master Volume (MV) Replication Volume (RV) Replication Volume (RV) NEC Storage DynamicDataReplication NEC Storage RemoteDataReplication Figure 1-1 Data Replication 1

8 Chapter 1 Data Replication Overview 1..2 Functiions by Product The following products are available for data replication. NEC Storage DynamicDataReplication (DDR), NEC Storage DynamicDataReplication Ver2 (DDR Ver2) Creates an RV in the same disk array. Supported by the NEC Storage2000/3000/4000 series NEC Storage RemoteDataReplication (RDR), NEC Storage RemoteDataReplication Ver2 (RDR Ver2) Creates an RV between different disk arrays. Supported by the NEC Storage3000/4000 series. * The replication management function in NEC Storage Manager can be used by introducing NEC Storage DynamicDataReplication or NEC Storage RemoteDataReplication. NEC Storage ReplicationControl Operates the replication function. Provides the CLI (Command Line Interface) and the API (Application Program Interface). NEC Storage ReplicationControl SQL Option Creates a snapshot without stopping operations on Microsoft SQL Server 2000 database constructed on the NEC Storage series. 2

9 Chapter 1 Data Replication Overview The NEC Storage Manager product provides functions for the administrator to understand the disk array configuration and operating state of the NEC Storage series with ease. The following products are available for NEC Storage Manager. NEC Storage Manager Displays the components of the disk array,monitors its state and notifies of its failure. NEC Storage PerformanceMonitor Monitors the performance of the disk array, collects its performance information and displays its performance on a real-time basis. NEC Storage ReplicationControl NEC Storage ReplicationControl SQL Option NEC Storage Manager Server NEC Storage Manager Client NEC Storage DynamicDataReplication NEC Storage RemoteDataReplication Figure 1-2 Functions by Product 3

10 Chapter 1 Data Replication Overview 1..3 Data Replliicatiion Advantages Data replications have the following advantages. Can create replications of a randomly selected MV at an arbitrary time. Can disconnect the RV at an arbitrary time to use for another purpose. At the time of resynchronization, synchronization is achieved in a short time by the update differential management function. Up to three RVs can be created. Connected Disconnected Creates replications AP instantly. AP Update differential backup Update MV Copying RV Disconnect Update MV RV Reflects the update information successively. Resynchronization Resynchronized in a short time through differential reflection. Disconnects replications at an arbitrary time to use for another purpose. Manages the respective update information of MVs and RVs as update differentials. With the update differential management function, only the updated data is reflected, and the processing time can be reduced. Since coinciding is processed in parallel with the MV access in the disk array, it is wait until the differential data is completed. It is also possible to resynchronize with (restore to) the status of the RV. Figure 1-3 Data Replication operation Provides the NEC Storage DynamicDataReplication in a disk array and the NEC Storage RemoteDataReplication between the disk arrays with the same visibility (operability). Considering reliability, the RAID configuration is adopted for replications as well. It is also possible to set a RAID type that differs from the original volume. Integrated control by NEC Storage Manager (GUI) 4

11 Chapter 1 Data Replication Overview Can unify the management of data replications by using NEC Storage Manager. Can display and set the operational states of data replications through graphical interfaces. Operation Status Display Window List Display Window NEC Storage Manager NEC Storage Series Figure 1-4 Data Replication operation Display Business Link Can perform automatic operations based on linkage between backup software and job scheduling software by using the CLI for NEC Storage ReplicationControl. 5

12 Chapter 1 Data Replication Overview 1..4 Examplles of Usiing Data Replliicatiion The RV that has been separated from the MV at an arbitrary time by using the data replication function can be used for other purposes. Because the disconnected RV is independent from the MV, using the RV will bring the following effects: Backup High-speed backup Online data replications can be created through simple operations. These replications can be used as backups as they are. As the replications are created in the disk array they do not affect the online system. Backup in parallel with online service Saving to tapes, etc. can be done from RVs in parallel with MVs, thus making it unnecessary to worry about online responses during saving. Parallel processing Executes the online and the search work simultaneously. By making the RV data independent for the search work, the update work and the search work can be operated without interference, thus solving the problem of competing for disk access and the resulting deadlock. Simultaneous execution of batch processing Execution time of batch processing can be substantially shortened by using RV. Constructing an evaluation environment Application evaluation An environment for application evaluation can be constructed with ease by using an RV. 6

13 Chapter 2 Overview of NEC Storage ReplicationControl SQL Option Chapter 2 Overview of NEC Storage ReplicationControl SQL Option 2..1 Product Functiion By applying NEC Storage ReplicationControl SQL Option product in combination with the data replication (NEC Storage DynamicDataReplication or NEC Storage RemoteDataReplication), the Microsoft SQL Server 2000 database built on the NEC Storage series is able to create a snapshot without suspending operations. Also, the snapshot is available in backup or parallel processing Advantages of NEC Storage ReplliicatiionControll SQL Optiion NEC Storage ReplicationControl SQL Option enables round-the-clock, uninterruptible operation using the Microsoft SQL Server 2000 database. If an error occurs while backing up the Microsoft SQL Server 2000 database using a data replication, NEC Storage ReplicationControl SQL Option is indispensable in recovering the data up to the moment of error occurrence by applying the transaction log backup. 7

14 Chapter 2 Overview of NEC Storage ReplicationControl SQL Option 2..3 System Confiiguratiion Business Server Backup Server This product NEC Storage ReplicationControl SQL Option Backup software NEC Storage ReplicationControl Tape drive Microsoft SQL Server2000 NEC Storage ReplicationControl Replication operation Management Server DB (MV) Replication Volume (RV) LAN NEC Storage Manager NEC Storage DynamicDataReplication NEC Storage RemoteDataReplication NEC Storage series Figure 2-1 System Configuration To install and use the data replication, the following hardware devices are required. (1) Disk array (NEC Storage Series) The NEC Storage3000/4000 series disk array (the Replication Director is required separately) equipped with a data replication (NEC Storage DynamicDataReplication; NEC Storage RemoteDataReplication), or the NEC Storage 2000 series disk array applies. (2) Management Server Manages the data replication. (3) Business Server Operates data replications. (4) Backup Server Backs up data. 8

15 Chapter 2 Overview of NEC Storage ReplicationControl SQL Option The software performing data replication consists of the following components. (1) NEC Storage ReplicationControl SQL Option Makes it possible to make a snapshot without suspending operation of the Microsoft SQL Server 2000 database. (2) NEC Storage ReplicationControl Provides the command that checks the replication operation and state from the business server. (3) NEC Storage Manager Provides the function to display the operation status of NEC Storage DynamicDataReplication and NEC Storage RemoteDataReplication and the pair volume settings. Installing NEC Storage DynamicDataReplication and NEC Storage RemoteDataReplication makes it possible to use the replication management function incorporated in the NEC Storage Manager. (4) NEC Storage DynamicDataReplication A function that facilitates data replication between the same disk arrays. (5) NEC Storage RemoteDataReplication A function that facilitates data replication between the different disk arrays. The NEC Storage ReplicationControl SQL Option product operates in linkage with either of the Microsoft software programs below. (1) Microsoft SQL Server 2000 Enterprise Edition (2) Microsoft SQL Server 2000 Standard Edition 9

16 Chapter 2 Overview of NEC Storage ReplicationControl SQL Option 2..4 Examplles of Usiing NEC Storage ReplliicatiionControll SQL Optiion Backup The operational application of making backup copies using an RV is described below. (1) Backup from an RV to a magnetic tape medium This is the backing up of an RV for an MV to a magnetic tape medium. By synchronizing and separating the MV and the RV during the time period when the load on the business operations that use the Microsoft SQL Server 2000 is lower, it is possible to back up copies onto magnetic tape media without suspending the operations. Since backup copies are made from RVs, MVs are not affected. Business Server Backup Server ProductionTask Connected Master Volume (MV) Separated Backup Tape Replication Volume (RV) Figure 2-2 Backup from RVs (a) During operation, keep the MV and the RV separate. (b) If the load is lowered, synchronize and separate the MV and the RV. (c) Execute the backup work concurrently with the business operation by using the separated RV. After the backup is completed, the separated RV can be used as a disk backup. 10

17 Chapter 2 Overview of NEC Storage ReplicationControl SQL Option (2) Using as a disk backup This refers to the use of an RV as a backup copy of an MV. This can be used as a disk medium backup without suspending operations because the MV and the RV are synchronized and separated during the time period when the load on the business operations that use the Microsoft SQL Server 2000 is lower. When restoring data from the backup data, it is possible to use backup data even if data from the RV to the MV is not completely copied. In the event that the data to access is not restored to the MV, restoration is realized through data access to the RV, thus making it unnecessary for the user to think about whether to use the MV or the RV. This makes it becomes possible to substantially reduce the data recovery time. Connect/Separate Replication Volume 1 (RV1) Separate Replication Volume 1 (RV1) Master Volume (MV) Separate Replication Volume 2 (RV2) Master Volume (MV) Connect/ Separate Replication Volume 2 (RV2) Separate Replication Volume 3 (RV3) Separate Replication Volume 3 (RV3) Figure 2-3 Use of RV as Backup (a) During operation, keep all MVs and RVs separate. (b) If the load is lowered, synchronize and separate MV1 and RV1. (c) Make backup copies by using RV1, RV2 and RV3 in order. 11

18 Chapter 2 Overview of NEC Storage ReplicationControl SQL Option Parallllell Processiing of Search Operatiions By creating an RV of the business operation database, the database can be separated into different volumes to execute the update work and the search work respectively. This makes it becomes possible to execute the database search work without affecting the database update work. The NEC Storage ReplicationControl SQL Option must be installed on the server performing the search work. The search work uses the standby database function on the Microsoft SQL Server When starting the business operation After the business operation is started Update work Search work Master Volume (MV) Master database Connect/ separate Replication Volume (RV) Run as standby data base Master Volume (MV) Master database Applying the transaction log Replication Volume (RV) Reflecting the update part Figure 2-4 Parallel processing of Search Work (a) When starting search work, the MV and the RV are synchronized and separated. (b) Hereafter is applying the transaction log backup reflects, the updated part of the business operation volume. 12

19 Chapter 2 Overview of NEC Storage ReplicationControl SQL Option Parallllell Processiing of Operatiions Accompaniied by Update By creating and separating an RV of the business operation database, the database can be used by other servers. This is used for constructing test environments. When constructing an environment, replications of the database can be made without suspending operations using the Microsoft SQL Server When the business operations load is lower, the MV and the RV are synchronized and separated. Nighttime Daytime Update work Search work Master Volume (MV) Master database Connect Replication Volume (RV) Reflecting the updated part Business Volume (MV) Master database Separate Replication Volume (RV) Data from previous day Figure 2-5 Parallel processing of Operations Accompanied by Update (a) During the daytime, keep the MV and the RV separate. (b) During the nighttime, stop parallel operation, synchronize and separate the MV and the RV. (c) Execute the operation DB and the replication DB in parallel. (RV being the data of the previous day) 13

20 Chapter 3 Database System Configuration Chapter 3 Database System Configuration Database configuration and concept of backups for the Microsoft SQL Server 2000 are briefly described below. For details, refer to the Microsoft SQL Server 2000 Books Online Database Confiiguratiion The Microsoft SQL Server 2000 database consists of three files; the primary data file, the secondary data file and the log file. The primary data file and the secondary data file are also simply called data file. Database File1.mdf File2.ndf File3.ndf File4.ndf File1.ldf File2.ldf File group 1 File group 2 Figure 3-1 Database Configuration Primary data file One database always has one primary data file. As the starting point of the database, the primary data file points to the locations of the secondary data and log files (File1.mdf in the diagram above). The file name extension for the primary data file is.mdf. Secondary data file As a data file, the secondary data file sometimes does not exist and sometimes multiple secondary data files exist (File2.ndf, File3.ndf and File4.ndf). The extension for the secondary data file is normally.ndf. Refers to the file where the log for recovery is stored. At least one file is required; sometimes, two or more files also exist (File1.ldf and File2.ldf in the diagram above). The file name extension for the log file is normally.ldf. 14

21 Chapter 3 Database System Configuration File group On Microsoft SQL Server 2000, this refers to a labeled aggregate of one or more files. assignment or a unit of database management is called a file group. The default file group is PRIMARY. A unit of Although it is not necessary that file extensions, such as.mdf,.ndf, and.ldf, be used with the Microsoft SQL Server 2000, those file extensions are useful for identifying file usage. By backing up the transaction log from the log file when a data error occurs, it is possible to recover data up to the point of error. This makes it necessary to allocate the data file and the log file in different logical volumes. To improve error resistibility, the data file and the log file are allocated to the logical volumes assigned to different RANK. For operational purposes, the NEC Storage ReplicationControl SQL Option targets all the files and file groups included in the database. When specifying MV/RV with the parameters of snapshot backup/restore commands, specify the MV/RV of all the files included in the database. The data replication function operates in logical disk units. Therefore, when different database files exist in a logical disk, all of the databases in the logical disk must be operated at the same time. Furthermore, the Microsoft SQL Server 2000 controls the connections of users for each instance. Therefore, it is not possible to refer to database information included in a different instance or information on the files and file groups contained in the database. The NEC Storage ReplicationControl SQL Option checks that the specified databases properly correspond to the operation target logical disks. However, when database files included in different instances exist in logical disks, it does not check the relationship between the databases and the logical disks. Therefore, when operating with multiple instances, be sure to specify all necessary databases and logical disks. The NEC Storage ReplicationControl SQL Option does not specify a static point on other files than those of database. Place only database files in the backup-target MV. 15

22 Chapter 3 Database System Configuration 3..2 Data Replliicatiion System Desiign When designing a system by using NEC Storage ReplicationControl SQL Option, it is necessary to design Microsoft SQL Server 2000 s database as well as NEC Storage s data replication relations. For information on designing the data replication system, refer to the NEC Storage Manager Data Replication User s Manual (Installation and Operation Guide for Windows) Applliicatiion to Backup System The concept of using the snapshot backup created by NEC Storage ReplicationControl SQL Option as a backup to the master operations is described below along with the restoration model for Microsoft SQL Server 2000 Books Online Backup Types (1) Snapshot backup Refers to the type of backup used on the NEC Storage ReplicationControl SQL Option. Functionally the same as the conventional database s complete backup and file backup, etc., this type is capable of roll forwarding by using the transaction log backup. In the same manner as other backups, the snapshot backup and recovery are traced with MSDB. (2) Database backup Since the snapshot backup is used, a complete backup of the database is not made. (3) Database differential backup Since the snapshot backup is used, a differential backup of the database is basically not made. (4) Transaction log backup The database can be restored to the state before the error occurred by combining the transaction log backup with the snapshot backup. In order to apply the transaction log after snapshot restoration, specify norecovery with the -remod option. Perform the system database backup or restoration by using the normal backup method or with NEC Storage ReplicationControl by suspending the business operations of Microsoft SQL Server For information on the timing of performing the system database backup, refer to the Microsoft SQL Server 2000 Books Online. 16

23 Chapter 3 Database System Configuration 3..4 Concept of Parallllell Processiing iin Other Nodes An explanation on using the snapshot backup created by the NEC Storage ReplicationControl SQL Option for parallel operations on Microsoft SQL Server of other nodes is offered below Standby Server By the snapshot backup, separated database file can be used as a search database by other servers. The search server must be used as a standby server. For details, refer to the Microsoft SQL Server 2000 Books Online. In this case, when performing snapshot restoration, specify -norestore and then specify standby for the -remod option. The database restored through snapshot restoration can be used as the database for the standby mode Log Diistriibutiion The database restored as the search database through snapshot restoration can apply backup of transaction logs updated with the business server in the same manner as the database for the normal standard mode. Through this work, data from the search database can be changed to data at the time when the transaction log was copied as a backup Server Accompaniied by Update Files from the database once disconnected through snapshot backup are used by other servers. In this case, attach the files of the disconnected database. They can be used in the same manner as the ordinary database. It is not possible to apply the backup of the transaction log updated by the business server. To reflect the data updated by the business server, MV/RV synchronization and separation are required Fiilles Operated iin Parallllell When files from the database once disconnected through snapshot backup are operated in parallel through another node, the files cannot be used as a disk backup. To use them as a backup, either copying them onto a tape as a backup or use multiple RVs. 17

24 Chapter 3 Database System Configuration 3..5 Operatiion Automatiizatiion The tape backup system, which used data replication, requires a linkage operation between the business operation side and the backup server side. NetBackup is available the backup software provided with the linkage function between servers. When using ARCserve and BackupExec, job scheduling software programs are required. 18

25 Chapter 4 Functions of NEC Storage ReplicationControl SQL Option Chapter 4 Functions of NEC Storage ReplicationControl SQL Option This chapter explains the its operational outline, command operation methods, display of various states, as well as some notes on the metafile management of the snapshot backup that is a function of the NEC Storage ReplicationControl SQL Option operating on the business server Snapshot Backup Snapshot backup refers to a function that performs snapshot backup and restoration without suspending the database by using the functions provided by Microsoft SQL Server 2000 and NEC Storage series data replication. The snapshot backup minimizes or eliminates the need for using the server s resource for backup purposes. The snapshot backup is conducted by the following functions: I/O freeze function Freezes the update I/O of Microsoft SQL Server 2000 to specify the static point of the database during the snapshot backup. Creation of metafile Refers to the file for storing Microsoft SQL Server 2000 s file configuration and transaction log state information, etc. The file is created during snapshot backup and the information is used for snapshot restoration. Data Replication operation Separates or connects MVs and RVs of NEC Storage by using the functions of NEC Storage ReplicationControl. Moreover, if the update I/O for the backup target database is attempted during the snapshot backup, the Microsoft SQL Server 2000 freezes the update I/O for all databases included in the instance in which the backup target database is located. Ending the snapshot backup will automatically release the control of the update I/O for all databases and resume the update I/O function. 19

26 Chapter 4 Functions of NEC Storage ReplicationControl SQL Option Snapshot Backup Operatiions The snapshot backup operation includes: (1) stopping the update I/O of Microsoft SQL Server 2000; (2) creating metafile; (3) flushing MV; (4) separating MV/RV. Business Server Backup Server (1) Stopping the database I/O (3) Flushing MV (4) Separating MV/RV Master Volume (MV) Replication Volume (RV) (2) Creating metafile Metafile Figure 4-1 Operation to Execute Snapshot Backup 20

27 Chapter 4 Functions of NEC Storage ReplicationControl SQL Option Snapshot Restore Operatiions The snapshot restore operation includes: (1) acquiring the MV information from the metafile; (2) unmounting MV; (3) restoring from RV to MV; (4) mounting MV; (5) restoring database. Business Server Backup Server (5) Restoring database (2) Unmounting MV (3) Restoring RV/MV (4) Mounting MV Master Volume (MV) Replication Volume (RV) (1) Acquiring the MV information from the metafile Metafile Figure 4-2 Operation to Execute Snapshot Restoration 21

28 Chapter 4 Functions of NEC Storage ReplicationControl SQL Option 4..2 Commands Commands used on the NEC Storage ReplicationControl SQL Option are described below. Table 4-1 Lists of the NEC Storage ReplicationControl SQL Option Commands Command name Operation name Description ismsql_snapshotbkup Snapshot backup Backs up database. ismsql_snapshotrst Snapshot restore Restores database from backup. * Operation rights are required for the users belonging to Administration group. When using the NEC Storage ReplicationControl SQL Option s commands, it is necessary to specify a configuration so that the NEC Storage ReplicationControl directly issues the replication operation I/O issuing path to the disk array. For explanation about commands and operation settings, refer to the NEC Storage Data Replication Command Reference Snapshot Backup Command Snapshot backup uses the ismsql_snapshotbkup command. By instructing Microsoft SQL Server 2000, ismsql_snapshotbkup command freezes the update I/O, creates the metafile for the specified path and records the database configuration and the transaction log state. Thereafter, it separates the MV and the RV where the specified database is stored. After the separation is completed, the command sends the completion instruction to Microsoft SQL Server 2000, which in turn creates the history in the MSDB. The following options can be specified for the ismsql_snapshotbkup command regarding snapshot backup operation. (1) Specifying the database name (-db dbname or dbfile dbfile_name) A name recognized by Microsoft SQL Server 2000 can be specified as the database name. When simultaneously performing snapshot backups on multiple databases, specify multiple database names in the database operation file. For details of the database operation file, refer to the NEC Storage Manager Data Replication Command Reference. (2) Specifying the metafile (-metafile metafile_name or metafolder metafolder_name) For the metafile, a metafile name created during snapshot backup can be specified. When simultaneously performing snapshot backups on multiple databases, specify the name of the folder that stores metafiles. Under the specified folder name, multiple metafiles that correspond to each database on which a snapshot backup has been performed are created. The name of the 22

29 Chapter 4 Functions of NEC Storage ReplicationControl SQL Option metafiles is as follows: Database name_metafile.dat The metafile can be created for the shared disk, MV or local disk. However, the data file for the database specified with -db or dbfile and the volume in which the log file is stored cannot be specified. This is to identify the database to be restored from the metafile content during recovery. To create metafile on the shared disk This is used when saving metadata on the backup server side. It eases metafile saving. To create metafile on the MV This is used when the shared disk cannot be used. It is necessary when separating after performing snapshot backup. To use the metafile information when executing snapshot restoration, it is necessary to restore metafile before executing the snapshot restoration. To create metafile on the local disk This is used when saving metadata on the local disk. (3) Specifying the pair volume Specify the MV volume and the RV volume. Specifying the MV (-mv volume -mvflg mv_flg): Specifies the MV volume and volume type. Specifying the RV (-rv volume -rvflg rv_flg): Specifies the RV volume and volume type. When specifying multiple pair volumes, describe the specification (-file file_name) in the replication operation file. For information on the volume type and replication operation file, refer to the NEC Storage Manager Data Replication Command Reference. When specifying a drive name with regard to a volume consisting of multiple partitions, all the partitions become included in the operation by specifying the drive name for any of the partitions. However, this functions only when the option that allows multiple partitions to be specified is enabled. For information on setting options, refer to the NEC Storage Manager Data Replication Command Reference. (4) Specifying RV access restriction after snapshot backup (-rvacc) Access restriction on the RV after snapshot backup can be specified. Read Only (-rvacc ro): Access to RV is possible only for reference purposes. Read/Write (-rvacc rw): Access to RV is possible for reference and update purposes. 23

30 Chapter 4 Functions of NEC Storage ReplicationControl SQL Option Unless well versed in OS and file system operations for Windows, Read Only (-rvacc ro) should not be specified for the RV access restriction. For details, refer to 3.6 RV Access Restrictions Setting of the NEC Storage Manager Data Replication User s Manual (Installation and Operation Guide for Windows). (5) Specifying waiting for snapshot backup completion (-wait/-nowait) With snapshot backup, the program can be made to wait for the end of the command after executing the separation. Wait specified (-wait [second]): When the value is specified to second, the disk array s monitoring time interval becomes the specified time. The specifiable value is 1 to 30 seconds (integer number). When the value is omitted, 5 seconds is set. No wait (-nowait): The command is ended only after specifying snapshot backup start. It is not made to wait for separation completion. The end of separation is checked by the ismrc_query command. (6) Canceling the MV/RV state check (-nocheck) Performs snapshot backup without checking the MV/RV state. Normally, the snapshot backup command is not operated unless synchronization between MV and RV is completed. Specifying -nocheck makes it possible to perform snapshot backup even when MV-RV synchronization is not completed. This is specified when the MV-RV synchronization time is unclear but immediate backup is necessary. (7) Specifying the time when the RV becomes available (-rvuse) The snapshot backup function makes it possible to specify the time at which the RV becomes available after separation has been performed. This specification is applicable when performing a snapshot backup without checking the state of the MV/RV. Normal separation (-rvuse complete): Allows the RV to be used after separation has been performed and the differential reflection (synchronization) of the MV and the RV has been completed. Immediate separation (-rvuse immediate): Makes the immediate use of the RV possible while the differential reflection (synchronization) of the MV and the RV is being performed after separation has been performed. 24

31 Chapter 4 Functions of NEC Storage ReplicationControl SQL Option Using the default setting (-rvuse default): Uses the setting stored in the replication operation option setting file. This function can be used only when NEC Storage DynamicDataReplication Ver2 has been installed in the disk array. For details about this function, refer to the NEC Storage Manager Data Replication User s Manual (Function Guide) and NEC Storage Manager Data Replication Command Reference. (8) Specifying the user ID/password The user ID/password to be connected to Microsoft SQL Server 2000 can be specified. When omitted, the user name and password for the Windows login account is used. No entry in the password field is recognized as no password. Specifying from the command line (-uid userid -pass password): Specifies the user ID/password from the command line. Specifying from the keyboard (-input): When executing the command, interactively enter a user ID and password by using a keyboard. User ID: Password: Enter a user ID. Enter a password. Those specifications can be described in the database operation file. For details of the database operation file, refer to the NEC Storage Manager Data Replication Command Reference. (9) Specifying the instance name (-server instance_name) The computer name and the instance name when connecting to a labeled instance can be specified. They can be specified in the format of computer_name\instance_name. When omitted, the connection is made to the default instance. The computer name must be either a local computer name, or a virtual computer name in the MSCS (Microsoft Cluster Server) environment. Those specifications can be described in the database operation file. For details of the database operation file, refer to the NEC Storage Manager Data Replication Command Reference. The ismsql_snapshotbkup command is used to output messages to each database on which a snapshot backup is performed when the snapshot backup operation starts and ends as well as when the flush/separate operation starts and ends. 25

32 Chapter 4 Functions of NEC Storage ReplicationControl SQL Option Start message SnapshotBackup Start YYYY/MM/DD hh:mm:ss DataBase db_name MV:physical-disk-no ld_name type Volume_name Path RV:physical-disk-no ld_name type Volume_name Path End message SnapshotBackup Normal End YYYY/MM/DD hh:mm:ss DataBase db_name MV:physical-disk-no ld_name type Volume_name Path RV:physical-disk-no ld_name type Volume_name Path Starting flush operation Flush Start YYYY/MM/DD hh:mm:ss Ending flush operation Flush Normal End YYYY/MM/DD hh:mm:ss Starting separation operation Separate Start YYYY/MM/DD hh:mm:ss Ending separation operation Separate Normal End YYYY/MM/DD hh:mm:ss Description of message YYYY/MM/DD hh:mm:ss Start/End time (YY/MM/DD hh:mm:ss) physical-disk-no PD number Path Drive name / NTFS folder name Volume_name MountPoint volume name ld_name LD name type OS Type db_name Database name Message during execution Separating... Only when specified by -wait is specified is this output until separation is completed.. is dynamically updated. 26

33 Chapter 4 Functions of NEC Storage ReplicationControl SQL Option SnapshotBackup Start YYYY/MM/DD hh:mm:ss DataBase db_name MV:physical-disk-no ld_name type Volume_name Path RV:physical-disk-no ld_name type Volume_name Path Flush Start YYYY/MM/DD hh:mm:ss Flush Normal End YYYY/MM/DD hh:mm:ss Separate Start YYYY/MM/DD hh:mm:ss Separating... Separate Normal End YYYY/MM/DD hh:mm:ss SnapshotBackup Normal End YYYY/MM/DD hh:mm:ss DataBase db_name MV:physical-disk-no ld_name type Volume_name Path RV:physical-disk-no ld_name type Volume_name Path Execution Conditions When performing snapshot backup, it is necessary to meet the following conditions. (1) MVs and RVs targeted for operation should be set as a pair. (2) The pair targeted for operation should be principally during restoration synchronization or replication. (3) The Copy Control State of the pair targeted for operation should be in the foreground copy status. * To separate the pairs in the background copy state, it is necessary to perform the copy restart operation to place the pairs in the foreground copy status. (4) The disk array in which the specified MV and RV are stored should not be in the freeze state. (5) The MV targeted for operation should be registered in the volume correspondence table. (6) The volume of MVs and RVs targeted for operation should be a basic volume. (Specifying a volume using dynamic volume function is not allowed.) (7) The MV must exist in the disk array under the own host control. (8) The data file and the log file included in the database should exist in the target MV. (9) When specifying a database name with the -db option, only one database must exist in the target MV. (10) When specifying a database name with the -dbfile option, all databases that exist in the target MV must be specified. (11) The metafile-specified location should not be the volume where the data file and log file of the database are stored. (12) The disk where the metafile is created should have unused space. Figure 4-3 shows the execution conditions of the snapshot backup ((1) to (12) in the diagram refer to the numbers above). 27

34 Chapter 4 Functions of NEC Storage ReplicationControl SQL Option Pairs targeted for operation MV data MV log Shared disk RV data RV log (1) Should be set as a pair. (2) Should not be during restoration execution. (3) Should be foreground. (4) Should not be in the freeze status. (5) Should be registered in the volume correspondence table. (6) Should be the basic volume. (7) MVs should be a disk array under the own-host control. (8) The data and log files of the database should be in MV. (9) When specifying a database name with the -db option, only one database must exist in the target MV. (10) When specifying a database name with the -dbfile option, all databases that exist in the target MV must be specified. Metafile (11) The metafile should not be other than the targeted MV. (12) Space for creating metafile should be available. Figure 4-3 Execution Conditions of Snapshot Backup 28

35 Chapter 4 Functions of NEC Storage ReplicationControl SQL Option Operation Example An example of snapshot backup operation is shown below. C:\>iSMsql_snapshotbkup -db snap -metafile c:\snap\snapdat.dat -wait 2 SnapshotBackup Start YYYY/MM/DD hh:mm:ss DataBase snap MV: 4 dev001 WN \\?\Volume{3a78b50b-0f0b-11d5-9c c7929e8}\ D: RV: 5 dev002 WN \\?\Volume{2213cadd-24e9-11d5-bf c7929e8}\ - Flush Start YYYY/MM/DD hh:mm:ss Flush Normal End YYYY/MM/DD hh:mm:ss Separate Start YYYY/MM/DD hh:mm:ss Separating... Separate Normal End YYYY/MM/DD hh:mm:ss SnapshotBackup Normal End YYYY/MM/DD hh:mm:ss DataBase snap MV: 4 dev001 WN \\?\Volume{3a78b50b-0f0b-11d5-9c c7929e8}\ D: RV: 5 dev002 WN \\?\Volume{2213cadd-24e9-11d5-bf c7929e8}\ - C:\> Explanation Database snap is in the d: drive. The d: drive s LD (logical disk) is dev001; and a pair is set with dev002. Snapshot backup is performed on the dev001 and dev002 pair. Waits for the command completion until separation is completed. 29

36 Chapter 4 Functions of NEC Storage ReplicationControl SQL Option Snapshot Restore Command Snapshot restore uses the ismsql_snapshotrst command. By executing ismsql_snapshotrst command, the restoration target volume is identified from the specified metafile to be restored from the RV to the MV. After restoration is executed, the database must be restored by giving the restoration instruction to Microsoft SQL Server When using an RV as a file system, it is necessary to release the mount of the file system. With the ismsql_snapshotrst command, the following options can be specified with regard to the restoration operation. (1) Specifying the database name (-db dbname or -dbfile dbfile_name) A name recognized by Microsoft SQL Server 2000 can be specified as the database name. When simultaneously performing snapshot backups on multiple databases, specify multiple database names in the database operation file. For details of the database operation file, refer to the NEC Storage Manager Data Replication Command Reference. (2) Specifying the metafile (-metafile metafilename or -metafolder metafolder_name) For the metafile, a metafile name incorporated during snapshot restoration can be specified. The metafile specified during snapshot backup must be specified. When simultaneously performing snapshot restorations on multiple databases, specify the name of the folder that stores metafiles. It is impossible to specify a metafile existing in the disk targeted for backup/restoration. (3) Specifying the pair volume Specify the MV volume and the RV volume. Specifying the MV (-mv volume -mvflg mv_flg): Specifies the MV s volume and volume type. Specifying the RV (-rv volume -rvflg rv_flg): Specifies the RV s volume and volume type. When specifying multiple pair volumes, describe the specification (-file file_name) in the replication operation file. For information on the volume type and replication operation file, refer to the NEC Storage Manager Data Replication Command Reference. When specifying a drive name with regard to a volume consisting of multiple partitions, all the partitions become included in the operation by specifying the drive name for any of the partitions. This, however, is limited to when the option allowing multiple partitions to be specified is enabled. 30

37 Chapter 4 Functions of NEC Storage ReplicationControl SQL Option For information on setting options, refer to the NEC Storage Manager Data Replication Command Reference. (4) Specifying the copying range (-cprange) Normally, only the differential area (diff) between MV and RV is copied. However, this option can specify explicitly that the full area be copied. (5) Specifying the Copy Control State (-cpmode) The Copy Control State during restoration execution and in the synchronous state can be specified at the same time as snapshot restoration. Synchronous copy (-cpmode sync): Places the Copy Control State in the synchronous copy mode. Semi-synchronous copy (-cpmode semi): Places the Copy Control State in the semi-synchronous copy mode. Semi-synchronous copying can be specified for two differing disk array pairs. Background copy (-cpmode bg): Places the Copy Control State in the background copy state. (6) Specifying the RV access restriction (-rvacc) The access-to-rv restriction during snapshot restoration execution and in the snapshot complete state can be specified. Not Ready (-rvacc nr) Placed in the Not Ready state, thus making it impossible for the host to operate the volume. Read Only (-rvacc ro) Enables the host to only read the volume. Unless well versed in OS and file system operations for Windows, Read Only (-rvacc ro) should not be specified for the RV access restriction. For details, refer to 3.6 RV Access Restrictions Setting of the NEC Storage Manager Data Replication User s Manual (Installation and Operation Guide for Windows). (7) Specifying waiting for copy completion (-wait/-nowait) With snapshot restoration, the program can be made to wait for the end of the command after the restoration operation until being placed in the synchronous state. Wait specified (-wait [second]): When the value is specified to second, the disk array s monitoring time interval becomes the specified time. The specifiable value is 1 to 30 seconds (integer number). When the value is omitted, 5 seconds is set. No wait (-nowait): The command is ended after only specifying snapshot restoration start. 31

38 Chapter 4 Functions of NEC Storage ReplicationControl SQL Option The end of restoration is checked by the ismrc_query command. (8) Specifying the RV operation mode (-mode) Specify the RV operation mode applicable when restoration is performed. RV update restoration (-mode update) Restores the update that has been performed on the MV while reflecting the update on the RV. After the restoration has been completed, the mode switches to the restoration complete state. RV protection restoration (-mode protect) Restores the update that has been performed on the MV without reflecting the update on the RV. After the restoration has been completed, the RV is automatically separated and the mode switches to the separation complete state. Using the default setting (-mode default) Uses the setting stored in the replication operation option setting file. This function can be used only when either the NEC Storage DynamicDataReplication Ver2 or the NEC Storage RemoteDataReplication Ver2 is installed in the disk array. For details about this function, refer to the NEC Storage Manager Data Replication User s Manual (Function Guide) and NEC Storage Manager Data Replication Command Reference. (9) Specifying the user ID/password The user ID/password to be connected to Microsoft SQL Server 2000 can be specified. When omitted, the user name and password for the Windows login account is used. No entry in the password field is recognized as no password. Specifying from the command line (-uid userid -pass password): Specifies the user ID/password from the command line. Specifying from the keyboard (-input): When executing the command, interactively enter a user ID and password by using a keyboard. User ID: Password: Enter a user ID. Enter a password. Those specifications can be described in the database operation file. For details of the database operation file, refer to the NEC Storage Manager Data Replication Command Reference. (10) Specifying the instance name (-server instance_name) The computer name and the instance name when connecting to a labeled instance can be specified. 32