AIX 5L Problem Determination - IBM Redbooks

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AIX version level Verify that the volume group you are importing is supported by the level of AIX running on the system. Various new features have been added to the LVM system at different levels of AIX, such as support for large volume groups. A number of these features require a change to the format of the VGDA stored on the disk, and thus will not be understood by previous levels of AIX. Invalid PVID Check that all of the disks in the volume group you are trying to import are marked as available to AIX and have valid PVIDs stored in the ODM. This can be checked using the lspv command. If any disks do not have a PVID displayed, use the chdev command to resolve the problem. For example: # lspv hdisk0 000bc6fdc3dc07a7 rootvg hdisk1 000bc6fdbff75ee2 testvg hdisk2 000bc6fdbff92812 testvg hdisk3 000bc6fdbff972f4 None hdisk4 None None # chdev -l hdisk4 -a pv=yes hdisk4 changed # lspv hdisk0 000bc6fdc3dc07a7 rootvg hdisk1 000bc6fdbff75ee2 testvg hdisk2 000bc6fdbff92812 testvg hdisk3 000bc6fdbff972f4 None hdisk4 000bc6fd672864b9 None In this example, the PVID for hdisk4 is not shown by the lspv command. This is resolved by running the chdev command. The PVID is read from the disk and placed in the ODM, if the disk is accessible. It will only write a new PVID if there truly is no PVID on the disk. Alternately, the disk can be removed using the rmdev command and, by running the configuration manager cfgmgr command, the device is recreated with the correct PVID. After this, an import of the volume group with the importvg command should be possible. Disk change while volume group was exported If the importvg command fails with an error message similar the following, the physical volume is marked missing and it is possible that some disk change to the disks defined in the volume group was made while the volume group was exported: 0516-056 varyon testvg: The volume group is not varied on because a physical volume is marked missing. Run diagnostics. 142 IBM ^ Certification Study Guide - AIX 5L Problem Determination Tools and Techniques
Check the error log with the errpt command in order to see what happened to the respective disk. In order to force the volume group to be varied online, use the -f flag of the importvg command. This makes it possible to operate on the volume group and, depending on the situation, reconfigure the volume group by excluding the disk that is marked missing with the reducevg command. Shared disk environment In a shared disk environment, such as an SSA disk system, used by two or more systems, it is possible that the physical volumes defined are not accessible because they are already imported and varied on by another machine. Check the volume groups on both machines and compare the PVIDs by using the lspv command. 7.2.5 Extending the number of max physical partitions When adding a new disk to a volume group, you may encounter an error due to there being too few PP descriptors for the required number of PVs. This may occur when the new disk has a much higher capacity than existing disks in the volume group. This situation is typical on older installations, due to the rapid growth of storage technology. To overcome this, a change of the volume group LVM metadata is required. The chvg command is used for this operation using the -t flag and applying a factor value, as shown in the following example: # lsvg testvg VOLUME GROUP: testvg VG IDENTIFIER: 000bc6fd5a177ed0 VG STATE: active PP SIZE: 16 megabyte(s) VG PERMISSION: read/write TOTAL PPs: 542 (8672 megabytes) MAX LVs: 256 FREE PPs: 42 (672 megabytes) LVs: 1 USED PPs: 500 (8000 megabytes) OPEN LVs: 0 QUORUM: 2 TOTAL PVs: 1 VG DESCRIPTORS: 2 STALE PVs: 0 STALE PPs: 0 ACTIVE PVs: 1 AUTO ON: yes MAX PPs per PV: 1016 MAX PVs: 32 # chvg -t 2 testvg 0516-1193 chvg: WARNING, once this operation is completed, volume group testvg cannot be imported into AIX 430 or lower versions. Continue (y/n) ? y 0516-1164 chvg: Volume group testvg changed. With given characteristics testvg can include upto 16 physical volumes with 2032 physical partitions each. Chapter 7. LVM, file system, and disk problem determination 143
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ibm.com/redbooks IBM Certification
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Note: Before using this information
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3.5.1 The /etc/inittab file . . . .
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7.2.1 Data relocation . . . . . . .
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9.9.1 The lslicense command . . . .
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x IBM ^ Certification Study Guide -
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10-12 Performance tuning flowchart
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8-7 Commonly used flags of the rout
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Trademarks The following terms are
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This publication does not replace p
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Comments welcome Your comments are
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1.1 Certification requirements To a
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e. Verify that file systems are mou
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Preparation for this exam is the to
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2.1 Defining the problem The first
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If the problem occurs on more than
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2.4.1 Answers The following are the
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3.1 A general overview of the boot
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mainly to components on the motherb
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Figure 3-3 Task selection menu in d
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3.2.2 PCI systems next step is to s
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3.3 Boot phase 1 Newer PCI architec
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3.4 Boot phase 2 In boot phase 2, t
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As mentioned, there are a lot of di
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3.4.3 LED 518 product documentation
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Figure 3-9 Boot phase 3 /etc/initta
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3.5.2 LED 553 3.5.3 LED c31 3.5.4 L
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3.5.5 pSeries servers A specific LE
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When the system is gracefully shut
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LED Reason/action c31 Define the co
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3. A file system is being mounted b
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3.9.1 Answers 3.10 Exercises The fo
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4.1 Hardware basics RS/6000 and pSe
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The most important fields in the pr
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Figure 4-1 Main diagnostics menu Th
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► Full testing requires that the
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3. Place the CD-ROM into the drive.
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Note: This service aid is only pres
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2. Select Change Show use of an SSA
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LED 299 A LED code of 299 shows tha
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Figure 4-2 Format of the 103 code m
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4.5 Quiz The following assessment q
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4.5.1 Answers 4.6 Exercises The fol
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5.1 Configuring the dump device Pri
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5.2 Starting a system dump A user-i
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A command status screen will be dis
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If the system does not have a key s
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The shconf command is invoked when
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5.4 Increasing the size of the dump
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Setting output device to /dev/rmt0.
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Look at the time of the dump and th
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Failure Causes SOFTWARE PROGRAM Rec
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Using crash, you can examine: ► A
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► ? or help[] Lists all subcomman
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LR: .waitproc+d4 (0000edc4) 2ff3b38
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DSIRR Data Storage Interrupt Reason
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the nfs_max_threads parameter of th
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Flags Description -s host Records p
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8.6 Quiz Table 8-8 Commonly used fl
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8. Which of the following options w
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8.6.1 Answers 8.7 Exercises The fol
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9.1 User license problems If it is
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telnet: connect: A remote host did
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9.2.4 Telnet error If when attempti
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user is limited and defined as an A
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9.4.3 A full file system uid=0(root
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9.5.1 Trace hook IDs The events tra
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your trace, the system may be traci
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113 0.004261661 0.001518 unlock: lo
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If the sendmail command encounters
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9.8 Printing Task SMIT fast path Co
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Action or function System V PowerPC
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Switching between subsystems The op
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Flag Description -s Subsystem Speci
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9.10 Quiz Flag Description -O Optio
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6. A user has the ability to ping t
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Figure 10-1 General performance tun
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Display previously captured data Th
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10.1.2 The vmstat command The vmsta
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later). The method used in AIX Vers
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second. Large values indicate a CPU
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kernel routine records the process
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syncd 1 2 2 0 0 0 sh 1 1 1 0 0 0 sl
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The memory columns The memory colum
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The sr column The sr column shows t
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If you want to sort to the sixth co
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► Workload Management Class (-W)
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schedtune limitations The schedtune
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schedtune parameters are reset by t
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Normal files are automatically mapp
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tty: tin tout avg-cpu: % user % sys
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When looking for performance proble
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those that do not. If you are runni
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The netstat -m command The netstat
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spec buf 1 0 0 0 128 128 0 locking
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Late Collision Errors The Late Coll
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The retrans column displays the num
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Figure 10-3 Web-based System Manage
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Superclasses A superclass is a clas
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► Shared subclass: This subclass
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The sequence of attributes within a
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This manual assignment can be done
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This defines three levels of privil
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The class assignment is done by WLM
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Figure 10-8 shows the SMIT panel wh
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Figure 10-10 SMIT panel for rset re
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10.6.1 The dbx command The dbx comm
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Subcommand Description return Conti
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15) phxent_dd [5 entries] 16) kbddd
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10.8 Command summary The following
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10.8.4 The nfsstat command 10.9 Qui
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6. Which command will show system c
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11.1 Overview 11.1.1 Terminology 11
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Note: Before installing a new set o
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► APAR number, such as IY00301. I
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► To install all filesets associa
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Table 11-2 Commonly used flags of t
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11.5 Quiz Flag Description -f Check
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- A Web server The browser must be
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Figure 12-2 HTTP filesets If you ar
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- Remote computer Type the remote d
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Figure 12-4 Documentation Library S
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CISPR International Special Committ
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I/O Input/Output I 2 C Inter Integr
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OEM Original Equipment Manufacturer
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SPM System Performance Measurement
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Other resources These publications
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phase1 figure 23 phase2 15, 24, 36
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pc.statd 189 daemons shdaemon 73 te
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host name resolution telnet login p
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N name resolution diagnostic 185 pr
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ecent CPU usage 241 recovering an i
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System Resource Controller (SRC) 13
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IBM Certification Study Guide - AIX
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AIX 5L Problem Determination - IBM Redbooks

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