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Figure 2-18 Shared Ethernet Adapter A virtual Ethernet adapter connected to the Shared Ethernet Adapter must have the Access External Networks check box (named the trunk flag in some earlier releases of the HMC) enabled. Once an Ethernet frame is sent from a virtual Ethernet adapter on a client partition to the <strong>POWER</strong> Hypervisor, the <strong>POWER</strong> Hypervisor searches for the destination MAC address within the VLAN. If no such MAC address exists within the VLAN, it forwards the frame to the virtual Ethernet adapter on the VLAN that has the Access External Networks option enabled. This virtual Ethernet adapter corresponds to a port of a layer-2 bridge, while the physical Ethernet adapter constitutes another port of the same bridge. 82 <strong>Advanced</strong> <strong>POWER</strong> <strong>Virtualization</strong> on IBM System p5
Note: A Shared Virtual Adapter does not need to have IP configured to be able to perform the Ethernet bridging functionality. But it is very convenient to configure IP on the Virtual I/O Server, because then the Virtual I/O Server can be reached by TCP/IP, for example, to perform dynamic LPAR operations or to enable remote login. This can be done either by configuring an IP address directly on the SEA device, but it is sometimes more convenient to define an additional virtual Ethernet adapter into the Virtual I/O Server carrying the IP address and leave the SEA without the IP address, allowing for maintenance on the SEA without loosing IP connectivity in case SEA failover is configured. Neither has a remarkable impact on Ethernet performance. The SEA directs packets based on the VLAN ID tags. One of the virtual adapters in the Shared Ethernet Adapter on the Virtual I/O Server must be designated as the default PVID adapter. Ethernet frames without any VLAN ID tags that the SEA receives from the external network are forwarded to this adapter and assigned the default PVID. In Figure 2-18 on page 82, it is ent2 that is designated as the default adapter, so all untagged frames received by ent0 from the external network will be forwarded to ent2. Since ent1 is not the default PVID adapter, only VID=2 will be used on this adapter, and the PVID=99 of ent1 is not important. It could be set to any unused VLAN ID. Alternatively, ent1 and ent2 could also be merged into a single virtual adapter ent1 with PVID=1 and VID=2, being flagged as the default adapter. When the SEA receives or sends IP (IPv4 or IPv6) packets that are larger than the MTU of the adapter that the packet is forwarded through, either IP fragmentation is performed, or an ICMP packet too big message is returned to the sender, if the Do not fragment flag is set in the IP header. This is used, for example, with Path MTU discovery. Theoretically, one adapter can act as the only contact with external networks for all client partitions. Depending on the number of client partitions and the network load they produce, performance can become a critical issue. Because the Shared Ethernet Adapter is dependent on Virtual I/O, it consumes processor time for all communications. A significant amount of CPU load can be generated by the use of virtual Ethernet and Shared Ethernet Adapter. There are several different ways to configure physical and virtual Ethernet adapters into Shared Ethernet Adapters to maximize throughput: ► ► Using Link Aggregation (EtherChannel), several physical network adapters can be aggregated. Refer to 4.1.2, “Using Link Aggregation or EtherChannel to external networks” on page 187 for more details. Using several Shared Ethernet Adapters provides more queues and more performance. Chapter 2. <strong>Virtualization</strong> technologies on System p servers 83
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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
Page 58 and 59: management interface for systems wi
Page 60 and 61: When setting up a partition, you ha
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Page 66 and 67: Figure 2-5 shows the usage of the s
Page 68 and 69: 2.4.5 Dynamic partitioning Partitio
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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
Page 98 and 99: ► VLAN 2 - Node A-2 - Node B-3 -
Page 100 and 101: VLAN support in AIX 5L is based on
Page 102 and 103: 2. Tagged port receives a packet ta
Page 104 and 105: page 78. EtherChannel and Link Aggr
Page 106 and 107: Note: In this type of configuration
Page 110 and 111: Other aspects that have to be taken
Page 112 and 113: ► Only packets for the VLAN speci
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Page 116 and 117: ► The value proposition enabling
Page 118 and 119: Figure 2-21 Virtual SCSI architectu
Page 120 and 121: Figure 2-23 and Figure 2-24 show th
Page 122 and 123: 4. In the Virtual I/O Server, vios1
Page 124 and 125: The following are the steps to unco
Page 126 and 127: ► ► A logical volume on the Vir
Page 128 and 129: I/O configuration, performance is a
Page 130 and 131: Hardware management is done by an H
Page 132 and 133: VMC allows IVM to provide basic log
Page 134 and 135: Virtual TTY In order to allow LPAR
Page 136 and 137: 2.13.1 Linux device drivers for IBM
Page 138 and 139: Mirroring Linux can mirror disks by
Page 140 and 141: Figure 2-29 Bridging a virtual and
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Page 144 and 145: 3.1 Getting started This section pr
Page 146 and 147: lspath mkpath mkvdev mkvt rmdev rmp
Page 148 and 149: 3.1.2 Hardware resources managed Th
Page 150 and 151: 3.2 Creating a Virtual I/O Server p
Page 152 and 153: 3. Enter the partition name and ID
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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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