Advanced Virtual I/O Server Configurations. César Diniz Maciel Consulting IT Specialist IBM US

Transcription

1 Advanced Virtual I/O Server Configurations César Diniz Maciel Consulting IT Specialist IBM US

2 Agenda Virtual Optical Devices, Virtual Optical Media, File-backed Devices Shared Ethernet Adapter (SEA) Failover SEA over Host Ethernet Adapter (HEA) Live Partition Mobility configuration Virtual Tape N-Port ID Virtualization (NPIV) Heterogeneous Multipathing Active Memory Sharing

3 Progression of Virtual Storage Devices on VIOS The ability to share virtual SCSI disks backed by a Physical Volume (PV) or a Logical Volume (LV) has been available from the beginning. VIO server 1.2 gave the ability to share the CDROM drive with client LPARs through Virtual Optical devices. With VIO server 1.5, the ability to create file-backed virtual devices in addition to virtual SCSI devices backed by a PV or LV Using the cpvdi command a virtual device image can now be copied from one virtual target device (VTD) to a different VTD. This feature was added under VIO FP11.1.

4 Power Systems Virtual Optical Device padmin user commands in VIO server $ lsdev -type optical name status cd0 Available description SATA DVD-ROM Drive $ mkvdev vdev cd0 vadapter vhost3 vtopt0 available $ lsmap -vadapter vhost0 SVSA Physloc Client Partition ID vhost0 U C1C1C-V1-C13 0x VTD LUN Backing device Physloc vtopt0 0x cd0 U787A.001.DNZ00ZE-P4-D3

5 Power Systems Virtual Optical Device Backing device (disk, lv, file or media)

6 Client connection - Option One On old client # lsdev Cl cd0 F parent vscsi2 # rmdev R vscsi2 On new client # cfgmgr

7 Client Side - Virtual Optical Device First AIX client LPAR to activate will show new vscsi adapter and cd0 available # lsdev -Cs vscsi cd0 Available Virtual SCSI Optical Served by VIO Server hdisk0 Available Virtual SCSI Disk Drive # lsdev -Cs vscsi -F "name physloc cd0 U C1C1C-V3-C2-T1-L hdisk0 U C1C1C-V3-C31-T1-L # lsdev -Cc adapter ent0 Available Virtual I/O Ethernet Adapter (l-lan) vsa0 Available LPAR Virtual Serial Adapter vscsi0 Available Virtual SCSI Client Adapter vscsi1 Available Virtual SCSI Client Adapter vscsi2 Available Virtual SCSI Client Adapter

8 Client Side - Virtual Optical Device Subsequent AIX client LPARs activate, but only show vscsi adapter Defined, and no optical device # lsdev -Cc adapter ent0 Available Virtual I/O Ethernet Adapter (l-lan) vsa0 Available LPAR Virtual Serial Adapter vscsi0 Available Virtual SCSI Client Adapter vscsi1 Available Virtual SCSI Client Adapter vscsi2 Defined Virtual SCSI Client Adapter This client s adapter will NOT configure while another client is connected to the server adapter # cfgmgr -vl vscsi2 Method error (/usr/lib/methods/cfg_vclient -l vscsi2 ): Error initializing a device into the kernel.

9 Client Side - Virtual Optical Device To release the optical device from owning LPAR # lsdev Cl cd0 F parent vscsi2 # rmdev R vscsi2 cd0 defined Now, cfgmgr in the receiving LPAR

10 Client connection - Option Two Move from the VIO server $ rmdev dev vtopt0 $ mkvdev vdev cd0 \ vadapter vhost# (where vhost# is the VSCSI adapter for the client Partition)

11 Virtual Optical Media File-backed device that works like an optical device (think of it as an ISO image). With read-only virtual media the same virtual optical device can be presented to multiple client partitions simultaneously You could easily boot from and install partitions remotely without having the need to swap out physical CD/DVDs or setup Network Installation Manager (NIM) server. It is also easier to boot a partition into maintenance mode to repair problems Easier to maintain a complete library of all the software needed for the managed system. Various software packages as well as all the necessary software levels to support each partition Client partitions could use blank file-backed virtual optical media for backup purposes (read/write devices) These file-backed optical devices could then be backed up from on the VIO server to other types of media (tape, physical CD/DVD, TSM server, etc.)

12 Virtual Optical Media Create an ISO file from CDROM $ mkvopt -name dvd.aix_6.1.iso -dev cd0 -ro You choose the name for this file, so make it meaningful Creates an ISO image from the media in /dev/cd0 After the.iso file is in your /var/vio/vmlibrary directory, run: $ mkvdev -fbo -vadapter vhost# vtopt0 Available Replace vhost# with your Virtual SCSI server adapter name. This mkvdev command creates your virtual optical target device. $ loadopt -vtd vtopt0 disk dvd.aix_6.1.iso The loadopt command loads vtopt0 with your ISO image Replace dvd.aix_6.1.iso with your meaningful filename

13 Converting between backing devices - cpvdi New command added at VIO FP-11.1 $ cpvdi -src input_disk_image -dst output_disk_image [-isp input_storage_pool] [-osp output_storage_pool] [-overwrite] [-unconfigure] [-f] [-progress] The cpvdi command copies a block device image, which can be either a logical or physical volume, a file-backed device, or a file on another existing disk. This command is NOT used to move data between non-virtualized disks and virtualized disks.

14 Starting from scratch on the VIO server $ mksp lv-storage-pool hdisk4 lv-storage-pool mkvg: Changing the PVID in the ODM. $ lspv NAME PVID VG STATUS hdisk0 00c23c9f9e9e1909 rootvg active hdisk1 00c23c9fa415621f clientvg active hdisk2 00c23c9f2fbda0b4 clientvg active hdisk3 00c23c9ffbf3c991 None hdisk4 00c23c9f20c41ad6 lv-storage-pool active $ mksp -fb file-storage-pl -sp lv-storage-pool -size 1G file-storage-pl File system created successfully kilobytes total disk space. New File System size is $ lssp Pool Size(mb) Free(mb) Alloc Size(mb) BDs Type rootvg LVPOOL clientvg LVPOOL lv-storage-pool LVPOOL file-storage-pl FBPOOL $ df Filesystem 512-blocks Free %Used Iused %Iused Mounted on /dev/hd % % / /dev/hd % % /usr /dev/hd9var % 474 1% /var /dev/hd % 384 1% /tmp /dev/hd % % /home /proc - /proc /dev/hd10opt % % /opt /dev/file-storage-pl % 4 1% /var/vio/storagepools/filestorage-pl

15 Creating a new Virtual Media Repository $ mkrep -sp lv-storage-pool -size 500M Virtual Media Repository Created Repository created within "VMLibrary_LV" logical volume $ lssp Pool Size(mb) Free(mb) Alloc Size(mb) BDs Type rootvg LVPOOL clientvg LVPOOL lv-storage-pool LVPOOL file-storage-pl FBPOOL VMLibrary_LV FBPOOL $ lsvopt VTD Media Size(mb) vtopt0 No Media n/a $ lsmap vadapter vhost0 SVSA Physloc Client Partition ID vhost0 U9117.MMA.1023C9F-V2-C11 0x VTD Status LUN Backing device Physloc vt_ec04 Available 0x client2lv VTD vtopt0 Status Available LUN 0x Backing device Physloc $ mkvopt -name vio-1-5-expansion.iso -file /var/vio/storagepools/file-storage-pl/vio-1-5expansion.iso -ro

16 Seeing the image on the client LPAR $ lsmap -all more SVSA Physloc Client Partition ID vhost0 U9117.MMA.1023C9F-V2-C11 0x VTD Status LUN Backing device Physloc vt_ec04 Available 0x client2lv VTD Status LUN Backing device Physloc From the client LPAR: vtopt0 Available 0x /var/vio/vmlibrary/vio-1-5-expansion.iso root@ec04 / # root@ec04 / # cd0 Available root@ec04 / # root@ec04 / # Filesystem /dev/hd4 /dev/hd2 /dev/hd9var /dev/hd3 /dev/hd1 /proc /dev/hd10opt /dev/cd0 cfgmgr lsdev -Cc cdrom Virtual SCSI Optical Served by VIO Server mount -v cdrfs -o ro /dev/cd0 /cdrom df 512-blocks Free %Used Iused %Iused % % % % % 494 7% % 64 1% % 20 1% % % % % Mounted on / /usr /var /tmp /home /proc /opt /cdrom

17 Agenda Virtual Optical Devices, Virtual Optical Media, File-backed Devices Shared Ethernet Adapter (SEA) Failover SEA over Host Ethernet Adapter (HEA) Live Partition Mobility configuration Virtual Tape N-Port ID Virtualization (NPIV) Heterogeneous Multipathing Active Memory Sharing

18 Shared Ethernet Adapter Physical access shared by multiple networks Physical access can be a single adapter or an aggregate of adapters (EtherChannel/Link Aggregation) Shared Ethernet operates at layer 2 Virtual Ethernet MAC visible to outside systems Broadcast/Multicast support

19 Create the Shared Ethernet Adapter (SEA) VIOS 1 Shared Ethernet Adapter Client 1 Client 2 en4 (if) ent1 (Phy) ent3 (LA) ent4 (SEA) en0 (if) en1 (if) en0 (if) en1 (if) ent0 (Phy) ent2 (Vir) ent0 (Vir) ent1 (Vir) ent0 (Vir) ent1 (Vir) VID 100 PVID 1 PVID 1 PVID 100 PVID 1 Untagged (PVID 1) VID 100 Create the Shared Ethernet Adapter (SEA) $ mkvdev -sea ent3 -vadapter ent2 -default ent2 -defaultid 1 ent4 Available en4 et4 PVID 100

20 Shared Ethernet Adapter Failover Client Virt Enet VIOS feature (indepentent of the client partition) Provides a backup adapter for the SEA, with active monitoring. Virtual Ethernet Control Channel between the two VIOS. No load balancing; only the primary SEA is active. Traffic flows through secondary SEA only when primary SEA fails. No configuration required on the client partition; everything is done on the two VIOS. Can be used with Etherchannel/802.3ad devices. Configured with the mkvdev command on both VIOS. VIOS 1 VIOS 2 SEA SEA Enet PCI Enet PCI Primary Backup

21 Shared Ethernet Adapter Failover, Dual VIOS Complexity Specialized setup confined to VIOS Resilience POWER5 Server Client Protection against single VIOS / switch port / switch / Ethernet adapter failure Virt Enet Throughput / Scalability Cannot do load-sharing between primary and backup SEA (backup SEA is idle until needed). SEA failure initiated by: Backup SEA detects the active SEA has failed. Active SEA detects a loss of the physical link Manual failover by putting SEA in standby mode Active SEA cannot ping a given IP address. Notes Requires VIOS V1.2 and SF235 platform firmware Can be used on any type of client (AIX, Linux, I (on POWER6) Outside traffic may be tagged VIOS 1 VIOS 2 SEA Enet PCI Primary SEA Control Channel Enet PCI Backup

22 Tips and considerations when using SEA and SEA Failover SEA Make sure there is no IP configured on either the physical Ethernet interface or the virtual interface that will be part of the SEA prior to performing the SEA configuration. You can optionally configure an IP address on the new SEA interface after the configuration is done. SEA failover If you have multiple SEAs configured on each of the VIO servers, then for each SEA pair, you need to configure a separate control channel with a unique PVID on the system. Make sure you configure the SEA failover adapter (on the second VIOS) at the same time you configure the primary adapter.

23 Agenda Virtual Optical Devices, Virtual Optical Media, File-backed Devices Shared Ethernet Adapter (SEA) Failover SEA over Host Ethernet Adapter (HEA) Live Partition Mobility configuration Virtual Tape N-Port ID Virtualization (NPIV) Heterogeneous Multipathing Active Memory Sharing

24 Virtualization: HEA Logical Port Concept To a LPAR, a HEA logical port Partition Partition Partition appears as a generic Ethernet interface With its own resources and MAC address Sharing bandwidth w/ other logical ports defined on same physical port Logical Ports Logical ports are allocated to Logical L2 switch HEA Physical Port 24 partitions Each Logical Port can be owned by a separate LPAR A Partition can own multiple Logical Ports Only one Logical Port per Physical Port per partition

25 Virtualization: SEA and HEA Virtual Ethernet and SEA I/O Hosting Linux ios HEA AIX Linux ios AIX Partition Packet Forwarder Virtual Ethernet Driver Virtual Ethernet Driver Virtual Ethernet Driver Ethernet Driver Ethernet Driver Ethernet Driver PHYP Virtual Ethernet Switch PHYP Ethernet adapter Networ k HEA...considerations Remove SW Forwarder bottleneck ƒ Adapter sharing with Native Performance 10 Gbps are likely to be shared by multiple partitions... ƒ Removes SW forwarding overhead ƒ LPAR mobility 25

26 When might you use SEA over IVE When the number of Ethernet adapters needed on a single partition is more than the number of physical ports available on the HEA(s) If the number of LPARs sharing a physical port exceeds the number of LHEA ports available Depends on the type of daughter card and the MCS value If you anticipate a future need for more adapters than you have LHEA ports (LP-HEA) available Very small amount of memory on LPAR Each LP-HEA needs around 102 MB system memory Some situations you might consider using a combination of SEA, 26 IVE, and/or dedicated Ethernet adapters

27 Considerations when using HEA on VIO When the VIO server uses the HEA as a SEA you must set the VIO server as a promiscuous LPAR for that LHEA When in promiscuous mode there is only one LP-HEA per physical port The promiscuous LPAR receives all unicast, multicast, and broadcast network traffic from the physical network. Always use flow control, and the large_send parameter for all Gigabit and 10 Gbit Ethernet adapters, and large_receive parameter when using a 10Gbit Ethernet adapter (VIOS ) to increase performance 27

28 Promiscuous Mode 28

29 Agenda Virtual Optical Devices, Virtual Optical Media, File-backed Devices Shared Ethernet Adapter (SEA) Failover SEA over Host Ethernet Adapter (HEA) Live Partition Mobility configuration Virtual Tape N-Port ID Virtualization (NPIV) Heterogeneous Multipathing Active Memory Sharing

30 Live Partition Mobility concepts Mover service partitions (MSP) Mover service partitions (MSP) is an attribute of the Virtual I/O Server partition. It enables the specified Virtual I/O Server partition to allow the functionality that asynchronously extracts, transports, and installs partition state. Two mover service partitions are involved in an active partition migration: one on the source system, the other on the destination system. Mover service partitions are not used for inactive migrations. Virtual asynchronous services interface (VASI) The source and destination mover service partitions use this virtual device to communicate with the POWER hypervisor to gain access to partition state. The VASI device is included on the Virtual I/O Server, but is only used when the server is declared as a mover service partition.

31 Partition Migration moves Active and Inactive LPAR Active Partition Migration Active Partition Migration is the actual movement of a running LPAR from one physical machine to another without disrupting* the operation of the OS and applications running in that LPAR. Supported by all POWER6based servers Applicability Workload consolidation (e.g. many to one) Workload balancing (e.g. move to larger system) Workload migration to newer systems Planned CEC outages for maintenance/upgrades Impending CEC outages (e.g. hardware warning received) Inactive Partition Migration Inactive Partition Migration transfers a partition that is logically powered off (not running) from one system to another. Subject to fewer compatibility restrictions than active partition migration because the OS goes through the boot process on the destination. Provides some ease of migration from systems prior to those enabled for active migration.

32 Requisites The mobile partition s network and disk access must be virtualized using one or more Virtual I/O Servers. The Virtual I/O Servers on both systems must have a shared Ethernet adapter configured to bridge to the same Ethernet network used by the mobile partition The Virtual I/O Servers on both systems must be capable of providing virtual access to all disk resources the mobile partition is using. The disks used by the mobile partition must be accessed through virtual SCSI and/or virtual Fibre Channel-based mapping

33 Normal Running Pre-Migration (Disk I/O Shown) LAN Source Partition. Adapt DD VIOS VIOS (VSCSI, VLAN, MSP) (VSCSI, VLAN, MSP) VSCSI Client DD VSCSI Server Adapt DD Adapt DD VSCSI Server PHYP Adapter PHYP Adapter Adapter SAN Disks Adapter

34 Create Target Partition LAN Source Partition VIOS VIOS (VSCSI, VLAN, MSP) (VSCSI, VLAN, MSP) VSCSI Client DD VSCI Server Adapt DD Adapt DD PHYP Adapter Target Partition VSCI Server PHYP Adapter Adapter SAN Disks Adapter

35 Transfer Partition State LAN Source Partition VIOS VIOS (VSCSI, VLAN, MSP) (VSCSI, VLAN, MSP) VSCSI Client DD VSCI Server Adapt DD Adapt DD PHYP Adapter VSCI Server Target Partition VSCSI Client DD PHYP Adapter Adapter SAN Disks Adapter

36 Transfer VIO to Target LAN Source Partition VIOS VIOS (VSCSI, VLAN, MSP) (VSCSI, VLAN, MSP) VSCSI Client DD VSCI Server Adapt DD Adapt DD PHYP Adapter VSCI Server Target Partition VSCSI Client DD PHYP Adapter Adapter SAN Disks Adapter

37 LAN Re-Attach icated Adapters (via DLPAR) Source Partition VIOS VIOS (VSCSI, VLAN, MSP) (VSCSI, VLAN, MSP) VSCSI Client DD VSCI Server Adapt DD Adapt DD PHYP Adapter VSCI Server Target Partition VSCSI Client DD. Adapt DD PHYP Adapter Adapter SAN Disks Adapter

38 LAN Clean Up Unused Resources Source Partition VIOS VIOS (VSCSI, VLAN, MSP) (VSCSI, VLAN, MSP) VSCSI Client DD VSCI Server Adapt DD Adapt DD PHYP Adapter VSCI Server Target Partition VSCSI Client DD. Adapt DD PHYP Adapter Adapter SAN Disks Adapter

39 Devices not supported for LPM IVE Virtual Optical Device Virtual Optical Media OS installed on internal disks OS installed on logical volumes or file-backed devices Virtual Tape

40 Agenda Virtual Optical Devices, Virtual Optical Media, File-backed Devices Shared Ethernet Adapter (SEA) Failover SEA over Host Ethernet Adapter (HEA) Live Partition Mobility configuration Virtual Tape N-Port ID Virtualization (NPIV) Heterogeneous Multipathing Active Memory Sharing

41 VIOS Virtual Tape Support Enables client partitions to directly access selected SAS tape devices, sharing resources and simplifying backup & restore operations SAS adapter is owned by VIOS partition Included with PowerVM Express, Standard, or Enterprise Edition Supports AIX 5.3 & 6.1 partitions and IBM i 6.1 partitions POWER6 processor-based systems VIOS SAS Adapter Virtual SCSI Adapter Virtual SCSI Adapter Power Hypervisor Tape drives supported DAT72: Feature Code 5907 DAT160: Feature Code 5619 HH LTO4: Feature Code 5746

42 VIOS Virtual Tape Support Virtual tape device created and managed the same way as a virtual disk mkvdev -vdev TargetDevice vadapter VirtualSCSIServerAdapter lsdev -virtual returns results similar to the following: name vhost3 vsa0 vtscsi0 status Available Available Available description Virtual SCSI Server Adapter LPAR Virtual Serial Adapter Virtual Target Device - Logical Volume vttape0 Available Virtual Target Device - Tape On the client partition, simply run cfgmgr to configure the virtual tape Device can be used as a regular tape, for data and OS backup and restore, including booting from media. Automated tape libraries are not supported.

43 Agenda Virtual Optical Devices, Virtual Optical Media, File-backed Devices Shared Ethernet Adapter (SEA) Failover SEA over Host Ethernet Adapter (HEA) Live Partition Mobility configuration Virtual Tape N-Port ID Virtualization (NPIV) Heterogeneous Multipathing Active Memory Sharing

44 NPIV N_Port ID Virtualization (NPIV) provides direct Fibre Channel connections from client partitions to SAN resources, simplifying SAN management Fibre Channel Host Bus Adapter is owned by VIOS partition Supported with PowerVM Express, Standard, and Enterprise Edition Supports AIX 5.3 and AIX 6.1 partitions Power 520, 550, 560, and 570, with an 8 GB PCIe Fibre Channel Adapter VIOS FC Adapter Virtual FC Adapter Virtual FC Adapter Power Hypervisor Statement of Direction Enables use of existing storage management tools Simplifies storage provisioning (i.e. zoning, LUN masking) Enables access to SAN devices including tape libraries IBM intends to support N_Port ID Virtualization (NPIV) on the POWER6 processor-based Power 595, BladeCenter JS12, and BladeCenter JS22 in IBM intends to support NPIV with IBM i and Linux environments in All statements regarding IBM's future direction and intent are subject to change or withdrawal without notice, and represent goals and objectives only.

45 NPIV details VIOS V2.1 (PowerVM Express, Standard, and Enterprise) Client OS support: AIX(5.3, 6.1); later in 2009, Linux and IBM i POWER6 only; Blade and High-End support in Gigabit PCI Express Dual Port Fibre Channel Adapter Compatible with Live Partition Mobility (LPM) VIO servers can support NPIV and vscsi simultaneously Clients can support NPIV, vscsi and dedicated Fibre Channel simultaneously HMC-managed and IVM-managed servers Unique Worldwide Port Name (WWPN) generation (allocated in pairs)

46 NPIV Simplifies SAN Management Current Virtual SCSI model N-Port ID Virtualization POWER6 AIX generic scsi disk generic scsi disk Virtual FC VIOS Shared FC Adapter FC Adapter EMC DS8000 Virtual SCSI FC Adapters AIX Disks Virtualized disks POWER5 or POWER6 VIOS FC Adapters SAN SAN DS8000 EMC DS8000 EMC

47 Partition SAN access through NPIV

48 SAN Switch requirements Only the first SAN switch attached to the Fibre Channel adapter needs to be NPIV capable Other switches in the environment do not need to be NPIV capable Not all ports on the switch need to be configured for NPIV, just the one which the adapter will use Check with your storage vendor to make sure the switch is NPIV capable Order and install the latest available firmware for your SAN switch

49 Create a Virtual Fibre Channel Adapter Client/server relationship similar to Virtual SCSI VSCSI Server on the VIOS, client on the client partition VFC Server on the VIOS, VFC client on the client partition

50 Mapping the adapter vfcmap binding the VFC Server to the Fibre Channel Port vfcmap -help Usage: vfcmap -vadapter VFCServerAdapter -fcp FCPName Maps the Virtual Fibre Channel Adapter to the physical Fibre Channel Port -vadapter Specifies the virtual server adapter. -fcp Specifies the physical Fibre Channel Port Example: vfcmap vadapter vfchost0 f After mapping done, running cfgmgr on the client partitions to configure SAN devices Before this step, zoning (if used) must be done on the switches. Virtual adapter WWPN can be obtained on the HMC.

51 WWPN for the Virtual Adapter

52 Agenda Virtual Optical Devices, Virtual Optical Media, File-backed Devices Shared Ethernet Adapter (SEA) Failover SEA over Host Ethernet Adapter (HEA) Live Partition Mobility configuration Virtual Tape N-Port ID Virtualization (NPIV) Heterogeneous Multipathing Active Memory Sharing

53 Dynamic Heterogeneous Multi-Path I/O Delivers flexibility for Live Partition Mobility environments Provides efficient path redundancy to SAN resources Supported between virtual NPIV and physical Fibre Channel Adapters AIX 5.3 and 6.1 partitions POWER6 processor-based servers VIOS FC Adapter NPIV VIOS Virtual FC Adapter FC Adapter Power Hypervisor 1) Real adapter 2) Virtual adapter to prepare for mobility FC Adapter Virtual FC Adapter NPIV FC Adapter Power Hypervisor 3) Partition moves via virtual adapter 4) Real adapter

54 Agenda Virtual Optical Devices, Virtual Optical Media, File-backed Devices Shared Ethernet Adapter (SEA) Failover SEA over Host Ethernet Adapter (HEA) Live Partition Mobility configuration Virtual Tape N-Port ID Virtualization (NPIV) Heterogeneous Multipathing Active Memory Sharing

55 PowerVM Active Memory Sharing Active Memory Sharing will intelligently flow memory from one partition to another for increased utilization and flexibility of memory usage. Memory virtualization enhancement for Power Systems Memory dynamically allocated based on partition s workload demands Contents of memory written to a paging device Improves memory utilization Extends Power Systems Virtualization Leadership Capabilities not provided by Sun and HP virtualization offerings Designed for partitions with variable memory requirements Low average memory requirements Active/inactive environments Workloads that peak at different times across the partitions Available with PowerVM Enterprise Edition AIX 6.1, Linux and i 6.1 partitions that use VIOS and shared processors POWER6 processor-based systems * All statements regarding IBM's future direction and intent are subject to change or withdrawal without notice, and represent goals and objectives only.

56 Active Memory Sharing Enables Higher Memory Utilization Memory allocation Memory requirements 25 Memory is allocated to partitions As workload demands change, Memory (GB) Partitions with dedicated memory 20 memory remains dedicated Memory allocation is not optimized to workload needs it enabling more throughput Higher memory utilization 5 Time 25 Memory Usage (GB) Memory is used by partition that 10 0 Partitions with shared memory Memory is allocated to shared pool Partition 3 Partition 2 Partition Partition 3 Partition 2 Partition Time

57 Active Memory Sharing Examples Partitions support workloads with memory demands that peak at different times Day and Night Partitions support day time web applications and night time batch 10 Asia Americas Europe 5 0 Time 15 Memory Usage (GB) Around the World Memory Usage (GB) Night Day 5 0 Infrequent use Large number of partitions with sporadic use Memory Usage (GB) 15 Time Time #10 #9 #8 #7 #6 #5 #4 #3 #2 #1

58 When not to use AMS High Performance Computing (HPC) applications that has high and constant memory usage Crash analysis, CFD, etc Databases that have fixed buffer cache allocation Generally use all the available memory on the partition, and buffer cache paging is undesirable Realtime, fixed response-time type of applications Predictability is key, so resources should not be shared

59 References Using File-Backed Virtual SCSI Devices, by Janel Barfield Configuring Shared Ethernet Adapter Failover Integrated Virtual Ethernet Adapter Technical Overview and Introduction IBM PowerVM Live Partition Mobility Power Systems Virtual I/O Server 59

60 Gracias César Diniz Maciel forotecnicoargentina.com/facebook