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To determine which path will use the VIO_Server2 partition, issue the lscfg command and verify the slot number for the VSCSI devices, as shown in Example 4-24. Example 4-24 Find out which parent belongs to which path # lscfg -vl vscsi0 vscsi0 U9117.570.107CD9E-V4-C10-T1 Virtual SCSI Client Adapter Device Specific.(YL)........U9117.570.107CD9E-V4-C10-T1 # lscfg -vl vscsi1 vscsi1 Adapter U9117.570.107CD9E-V4-C11-T1 Virtual SCSI Client Device Specific.(YL)........U9117.570.107CD9E-V4-C11-T1 In our example, the odd slot numbers are configured to point to the VIO_Server2 partition. To set the active path to use the VSCSI1 device, the priority will remain 1, which is the highest priority. Change the path using VSCSI0 to priority 2, as shown in Example 4-25. Example 4-25 Changing the priority of a path # chpath -l hdisk0 -p vscsi0 -a priority=2 path Changed Note: You may have to update the Preferred Path in the SAN to reflect the changed priority settings. 6. Reboot the client partition for the changes to take effect. Both changes require a reboot to be activated since this disk belongs to the rootvg and is in use. 7. Repeat these steps on the DB_server partition but with priority 2 for the path VSCSI1. 4.4.4 Concurrent disks in client partitions Normally, a disk is assigned to one machine and this machine is responsible for handling the access to files or raw devices on that disk. Concurrent disks are disks that are accessed from more than one machine at the same time. This happens regularly with clustering software and application software that is designed to run on more than one machine in parallel. It is possible to implement concurrent virtual disks on one physical machine, using Virtual I/O Servers on 232 <strong>Advanced</strong> <strong>POWER</strong> <strong>Virtualization</strong> on IBM System p5
that machine. For redundancy reasons with clustering software, at least two machines are required. A storage subsystem is required that can assign a disk to more than one machine. This can be some kind of Fibre Channel disk, for example, a DS4000 disk subsystem. Additionally, for smooth operation, we recommend that the Virtual I/O Servers are connected redundantly to the storage subsystem. On the operating system, the following has to be installed: ► bos.clvm as the basic layer, to enable concurrent access. ► The cluster software that is responsible for managing concurrent disks. ► The application software that is responsible for handling the locking mechanism on files or raw devices on the disk. To set up a concurrent disk, follow these steps: 1. Create the disk on the storage device. Follow the directions provided by the storage subsystem provider. 2. Assign the disk to two Virtual I/O Servers. How to do that depends on the type of storage subsystem. On a DS4000 type disk subsystem, for example, it would be assigned to a host group. 3. On the first Virtual I/O Server, scan for the newly assigned disk: $ cfgdev 4. On the first Virtual I/O Server, change the SCSI reservation of that disk to no_reserve so that the SCSI reservation bit on that disk is not set if the disk is accessed: $ chdev -dev hdiskN -attr reserve_policy=no_reserve (where N is the number of the disk in question; reservation commands are specific to the multipathing disk driver in use. This parameter is used with DS4000 disks, it can be different with other disk subsystems.) 5. On the first Virtual I/O Server, assign the disk to the first LPAR: $ mkvdev -vdev hdiskN -vadapter vhostN [ -dev XXX ] where N is the number of the disk respectively the vhost in question and the device name can be chosen to your liking but also left out entirely; the system will then create a name automatically. 6. On the first LPAR, scan for that disk: $ cfgdev Chapter 4. Setting up virtual I/O: advanced 233
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Front cover Advanced</stron
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Note: Before using this information
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2.1 New features in Version 1.3 of
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4.4.2 Configuration on the Virtual
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6.6.4 Managing memory resources . .
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3-9 Processing sharing mode and the
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5-14 Status window . . . . . . . .
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xiv Advanced <stro
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xvi Advanced <stro
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any form without payment to IBM, fo
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The team that wrote this redbook Th
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xxii Advanced <str
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- Additional information about the
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management” on page 257 discusses
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1.1.5 Virtual LAN 1.1.6 Virtual I/O
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The service processor provides the
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Adapter sparing Adapter sparing can
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1.4.1 IBM AIX 5L for System p5 syst
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Note: i5/OS partitions are only sup
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Function / capability IBM System z9
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1.6 The value of the Advanc
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18 Advanced <stron
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2.1 New features in Version 1.3 of
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► throughput and performance. For
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► IVM enhancements Industry leadi
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Shared Ethernet Adapter failover ca
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the partition. This allows you to c
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Figure 2-2 ASMI menu to enable the
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management interface for systems wi
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When setting up a partition, you ha
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partition with 0.50 processing unit
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processors and the other a single o
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Figure 2-5 shows the usage of the s
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2.4.5 Dynamic partitioning Partitio
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Number of virtual processors In gen
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The benefit of SMT is greatest wher
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Setting SMT mode using SMIT Use the
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The Hypervisor firmware and the hos
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Partition 2 is configured with one
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Note: The Virtual I/O Server suppor
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Most ISVs consider partitions with
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When a partition is running as unca
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► ► ► Selected IBM software p
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Shared pool = 4 CPU Sum EC = 3.0 PU
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For more information about the use
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Table 2-5 Licensing estimation for
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Maximum virtual processors used Cap
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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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Page 226 and 227: In Figure 4-11 on page 201, a clien
Page 228 and 229: When Virtual I/O Server 2 returns t
Page 230 and 231: few cycles to set up, but none for
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Page 236 and 237: 7. Check the devices list on your V
Page 238 and 239: Figure 4-17 shows the intended solu
Page 240 and 241: . Click the Create Adapter button,
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Page 244 and 245: Checking which SEA is active Checki
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Page 284 and 285: 5.1 Dynamic LPAR operations This se
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Page 296 and 297: The following command shows the eff
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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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