Advanced POWER Virtualization on IBM System p5 - Previous ...

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► throughput and performance. For additional information, see IBM System p <strong>Advanced</strong> <strong>POWER</strong> <strong>Virtualization</strong> Best Practices, REDP-4194. • Improvements for altering virtual device capacity without disruption. When expanding the LUN size on an FC attached storage subsystem as well as extending a Logical Volume within a volume group, the Virtual I/O Server will detect this and the virtual SCSI server adapter will present this change to the virtual SCSI client adapter. Upon recognition of the change, the volume group in the LPAR containing the hdisk represented by the LUN can take adavantage of the bigger disk with the command: # chvg -g volume_group and will immediately be able to use the additional storage capacity. This is valid for non-rootvg disks only. The chvg command is not supported with rootvg, as stated in the manual page. • A configurable attribute that, when enabled, allows the virtual client adapter driver to determine the health of the VIOS to improve and expedite path failover processing. The vscsi_path_to attribute of the virtual SCSI client adapter was added. A value of 0 (default) disables it, while any other value defines the number of seconds the VSCSI client adapter will wait for commands issued to the VSCSI server adapter and not serviced. If that time is exceeded, the VSCSI client adapter attempts the commands again and waits up to 60 seconds until it fails the outstanding commands, writes an error to the error log and, if MPIO is used, tries another path to the disk. Therefore, this parameter should only be set for MPIO installations with dual Virtual I/O Servers. • VSCSI device error log enhancements. Virtual Ethernet and shared Ethernet adapter Ethernet support was enhanced in the following ways: – TCP Segmentation Offload TCP segmentation offload (large send) enables TCP large send capability (also known as segmentation offload) from logical partitions to the physical adapter. The physical adapter in the SEA must be enabled for TCP largesend for the segmentation offload from the LPAR to the SEA to work, and the SEA itself must be enabled for large send. Also, the operating system must be capable of performing a large send operation. AIX 5L virtual Ethernet adapters are, by default, capable of large sends. You can enable or disable TCP large send on the SEA using the CLI chdev command. To enable it, use the -attr largesend=1 option. To disable it, use 22 <strong>Advanced</strong> <strong>POWER</strong> <strong>Virtualization</strong> on IBM System p5
the -attr largesend=0 option. For example, the following command enables large send for Shared Ethernet Adapter ent1: # chdev -dev ent1 -attr largesend=1. By default, the setting is disabled (largesend=0). LPARs can now offload TCP segmentation to VIOS Ethernet adapter, benefitting CPU intensive applications running on the LPAR. If a physical Ethernet adapter is used that supports large_send (packets of 64 KB are directly handed to the physical adapter layer where they are processed and split up in the packet size the physical network supports), this parameter can be enabled to boost performance. All writes to the physical network will benefit from this; the internal virtual network will use performance optimized network settings. To enable large send on a physical adapter on AIX 5L, use the following command: # chdev -l entX -a large_send=yes To enable large send on a physical adapter on the on the Virtual I/O Server, use the following command: # chdev -dev entX -attr large_send=yes As of Virtual I/O Server Version 1.3, the default value for large send on physical Ethernet adapters is yes. The default for the Shared Ethernet Adapter is 0 (meaning no). This will benefit only outbound traffic that is data to be send. Inbound traffic will be received in packets as they arrive from the physical network. Note: The following is a common source of errors: To modify large send on a physical Ethernet adapter, use the command option: large_send=yes or large_send=no To modify large send on a Shared Ethernet Adapter (SEA), use the command option: largesend=1 or largesend=0 ► Monitoring Agents for monitoring using Topas (included with AIX 5L V5.3) and PTX. PTX is a separately purchased LPP. Chapter 2. <strong>Virtualization</strong> technologies on System p servers 23
Page 1: Front cover Advanced</stron
Page 4 and 5: Note: Before using this information
Page 6 and 7: 2.1 New features in Version 1.3 of
Page 8 and 9: 4.4.2 Configuration on the Virtual
Page 10 and 11: 6.6.4 Managing memory resources . .
Page 12 and 13: 3-9 Processing sharing mode and the
Page 14 and 15: 5-14 Status window . . . . . . . .
Page 16 and 17: xiv Advanced <stro
Page 18 and 19: xvi Advanced <stro
Page 20 and 21: any form without payment to IBM, fo
Page 22 and 23: The team that wrote this redbook Th
Page 24 and 25: xxii Advanced <str
Page 26 and 27: - Additional information about the
Page 28 and 29: management” on page 257 discusses
Page 30 and 31: 1.1.5 Virtual LAN 1.1.6 Virtual I/O
Page 32 and 33: The service processor provides the
Page 34 and 35: Adapter sparing Adapter sparing can
Page 36 and 37: 1.4.1 IBM AIX 5L for System p5 syst
Page 38 and 39: Note: i5/OS partitions are only sup
Page 40 and 41: Function / capability IBM System z9
Page 42 and 43: 1.6 The value of the Advanc
Page 44 and 45: 18 Advanced <stron
Page 46 and 47: 2.1 New features in Version 1.3 of
Page 50 and 51: ► IVM enhancements Industry leadi
Page 52 and 53: Shared Ethernet Adapter failover ca
Page 54 and 55: the partition. This allows you to c
Page 56 and 57: Figure 2-2 ASMI menu to enable the
Page 58 and 59: management interface for systems wi
Page 60 and 61: When setting up a partition, you ha
Page 62 and 63: partition with 0.50 processing unit
Page 64 and 65: processors and the other a single o
Page 66 and 67: Figure 2-5 shows the usage of the s
Page 68 and 69: 2.4.5 Dynamic partitioning Partitio
Page 70 and 71: Number of virtual processors In gen
Page 72 and 73: The benefit of SMT is greatest wher
Page 74 and 75: Setting SMT mode using SMIT Use the
Page 76 and 77: The Hypervisor firmware and the hos
Page 78 and 79: Partition 2 is configured with one
Page 80 and 81: Note: The Virtual I/O Server suppor
Page 82 and 83: Most ISVs consider partitions with
Page 84 and 85: When a partition is running as unca
Page 86 and 87: ► ► ► Selected IBM software p
Page 88 and 89: Shared pool = 4 CPU Sum EC = 3.0 PU
Page 90 and 91: For more information about the use
Page 92 and 93: Table 2-5 Licensing estimation for
Page 94 and 95: Maximum virtual processors used Cap
Page 96 and 97: 2.8 Virtual and Shared Ethernet int
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► VLAN 2 - Node A-2 - Node B-3 -
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VLAN support in AIX 5L is based on
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2. Tagged port receives a packet ta
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page 78. EtherChannel and Link Aggr
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Note: In this type of configuration
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Figure 2-18 Shared Ethernet Adapter
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Other aspects that have to be taken
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► Only packets for the VLAN speci
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► Packets tagged with a VLAN othe
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► The value proposition enabling
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Figure 2-21 Virtual SCSI architectu
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Figure 2-23 and Figure 2-24 show th
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4. In the Virtual I/O Server, vios1
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The following are the steps to unco
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► ► A logical volume on the Vir
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I/O configuration, performance is a
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Hardware management is done by an H
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VMC allows IVM to provide basic log
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Virtual TTY In order to allow LPAR
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2.13.1 Linux device drivers for IBM
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Mirroring Linux can mirror disks by
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Figure 2-29 Bridging a virtual and
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116 Advanced <stro
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3.1 Getting started This section pr
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lspath mkpath mkvdev mkvt rmdev rmp
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3.1.2 Hardware resources managed Th
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3.2 Creating a Virtual I/O Server p
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3. Enter the partition name and ID
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5. You have the option to change th
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7. Select the Shared check box for
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9. Specify the processing sharing m
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11.Skip setting the I/O pools, as s
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2. Click the Create adapter button
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5. Add a virtual SCSI adapter to vi
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7. Select Normal for your boot mode
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A few seconds after the status wind
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3. Select the VIO_Server1 profile a
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You are now ready to use the newly
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3. Specify the Maximum virtual adap
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You can use the lsmap -all -net com
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2. Select the check box AIX or Linu
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2. Click Create client adapter. The
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4. Click Create server adapter and
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6. When the operation is complete,
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9. When you have completed adding v
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Server SCSI adapters have been adde
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Using logical partitions In our bas
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Note: Based on the lsdev -vpd comma
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It is useful to be able to map the
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Assuming that a NIM master is confi
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3. Set up the NIM master IP address
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3.4.6 Mirroring the Virtual I/O Ser
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Once the interaction between virtua
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Figure 3-45 shows the steps to crea
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Ethernet server adapter and a physi
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4.1 Providing higher serviceability
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Figure 4-1 MPIO and LV Mirroring wi
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Some advanced topics with respect t
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While EC is an Cisco-specific imple
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Alternatives for network high avail
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Figure 4-6 IP multipathing in the c
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SEA Failover works as follows: Two
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Although the alternative configurat
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► With NIB, the two internal netw
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In Figure 4-11 on page 201, a clien
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When Virtual I/O Server 2 returns t
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few cycles to set up, but none for
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4.1.7 Considerations The following
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. On step 10, allocate an unused Et
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7. Check the devices list on your V
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Figure 4-17 shows the intended solu
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. Click the Create Adapter button,
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Tip: Mismatching SEA and SEA Failov
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Checking which SEA is active Checki
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In this scenario, we attach each Vi
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2. Configure the SEA, as described
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5. Check for the vhost adapter usin
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8. Check again, using the lsdev com
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Check the mappings, as shown in Exa
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2. Check the MPIO configuration by
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To determine which path will use th
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7. On the first LPAR, create an enh
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A switch can be forced with the /us
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The configurations described in thi
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We recommend using mirroring, strip
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Supported multi-path configurations
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Supported scenarios using one Virtu
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Supported scenarios using multiple
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4.7.2 Supported Ethernet configurat
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In order to help clients improve th
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Clients can find the fixes and file
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Figure 4-35 shows the basic conside
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256 Advanced <stro
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5.1 Dynamic LPAR operations This se
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5. Figure 5-3 shows you the Virtual
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another partition. Use the lsslot -
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2. Select the adapter to be moved a
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5.1.3 Add memory dynamically in AIX
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5.1.4 Removing memory dynamically T
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The following command shows the eff
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2. Figure 5-17 shows the current pr
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et1 Defined 01-09 IEEE 802.3 Ethern
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1. Use the diagmenu command to unco
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5. Locate the blinking adapter, rep
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► Figure 5-19 shows you the topol
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Example 5-4 shows how to back up th
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Example 5-6 Creating a Virtual I/O
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5.2.5 Restoring the Virtual I/O Ser
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For an AIX 5L NIM server recovery,
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To view the System Plan, Select Sys
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In Example 5-11, we look to the map
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The last information we need is the
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In a mirrored environment, issue th
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Figure 5-23 shows that the virtual
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csm.diagnostics 1.5.0.0 # Cluster S
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os.txt.spell 5.3.0.10 # Writer's To
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hd3 jfs2 1 2 2 open/syncd /tmp hd1
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Adding a PCI hot plug adapter The t
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The following is a list of empty SC
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After the disk is replaced and brou
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2. Get a larger disk from the Virtu
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The updateios command does not comm
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Note: You can use dsh based on rsh,
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2 Checking if Redundancy with dual
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STATUS=`lspath -l $n | grep Failed
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Traditional performance measurement
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CPU statistics in shared-processors
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This is shown in Example 5-22 and E
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5.5.4 The topas command The topas c
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capped, and uncapped. The Mem and t
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Tip: The output of topas -cecdisp w
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These files can now be processed wi
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interval and count parameters. The
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The lparstat command POWER<
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Note: The variable capacity weight
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Column Measured parameter Comments
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The sysstat command The sysstat com
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write: wps avgserv minserv maxserv
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5.5.7 Monitoring with PLM The Parti
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Use the perfwb command to start the
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Using the r and p switches after st
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The nmon process runs in the backgr
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The POWER Hypervis
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5.7 Security considerations for Vir
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The firewall can be switched on and
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Enable mail client (dismaildmndls):
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Network option extendednetstats (ex
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Enable unsecure daemons (disrmtdmns
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Minimum number of chars (mindiffhls
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370 Advanced <stro
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6.1 Partition Load Manager introduc
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Notes: ► The PLM server may resid
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When PLM is notified that a partiti
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6.1.4 Memory management PLM manages
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However, the managed nodes know not
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sh and rcp During its installation,
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2. Create a toc file with the inuto
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. Append the PLM server public key
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You can set up the RMC using a scri
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Define a PLM policy as follows: 1.
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Table 6-2 CPU-related tunables CPU
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Memory tunables Table 6-4 shows the
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1. Start the Web-based System Manag
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4. Complete the information in the
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. Fill out the values for the tunab
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8. Specify the CPU resource policy
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Clicking the OK button will create
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. From the Web-based System Manager
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2. Click the Groups tab, and then t
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Figure 6-21 Edit Policy File partit
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The policy_file and log_file parame
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In its short form, the xlplm -Q com
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6.3 Point-in-time and recurring rec
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Select the type of operation you wi
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6.4 Tips and troubleshooting PLM Th
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Note: Exchanging keys is an importa
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The Identity entry is either based
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120200c10d3ad7a20951523b7c01bd31f42
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► ► PLM does not directly state
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6.6 Resource management Owners of I
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Characteristics of WLM, PLM, and sh
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Evaluating CPU utilization Traditio
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Shared-processor partitions support
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438 Advanced <stro
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FDX FLOP FRU FTP GDPS GID GPFS GUI
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442 Advanced <stro
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Other publications These publicatio
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► ► ► ► Virtual I/O Server
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cfgdev command 163, 203, 264 cfgmgr
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excess weight, PLM 376 extendlv com
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Micro-Partitioning 3, 32-33 49 capp
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processor dispatch 43, 50 processor
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VIO 59 virtual processor 61 mainten
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target 90, 92 virtual SCSI Server a
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Back cover Advanced</strong
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