AIX 5L Problem Determination - IBM Redbooks

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hdisk0 Available 30-58-00-8,0 16 Bit SCSI Disk Drive hdisk1 Available 30-58-00-9,0 16 Bit SCSI Disk Drive hdisk2 Available 10-60-00-8,0 16 Bit SCSI Disk Drive hdisk3 Available 10-60-00-9,0 16 Bit SCSI Disk Drive hdisk4 Available 10-60-00-12,0 16 Bit SCSI Disk Drive 2. The new hdisk must now be assigned to the volume group mirrorvg by using the LVM extendvg command: # extendvg mirrorvg hdisk4 3. To re-establish the mirror copy of the LV, use the mklvcopy command. # mklvcopy lvdb02 2 hdisk4 The number of copies of LV is now two, but the LV stat is still marked as stale because the LV copies are not synchronized with each other: # lsvg -l mirrorvg mirrorvg: LV NAME TYPE LPs PPs PVs LV STATE MOUNT POINT lvdb01 jfs 500 1000 2 open/syncd /u/db01 lvdb02 jfs 500 1000 2 open/stale /u/db02 loglv00 jfslog 1 1 1 open/syncd N/A 4. To get a fully synchronized set of copies of the LV lvdb02, use the syncvg command: # syncvg -p hdisk4 The syncvg command can be used with logical volumes, physical volumes, or volume groups. The synchronization process can be quite time consuming, depending on the hardware characteristics and the amount of data. After the synchronization is finished, verify the logical volume state using either the lsvg or lslv command: # lsvg -l mirrorvg mirrorvg: LV NAME TYPE LPs PPs PVs LV STATE MOUNT POINT lvdb01 jfs 500 1000 2 open/syncd /u/db01 lvdb02 jfs 500 1000 2 open/syncd /u/db02 loglv00 jfslog 1 1 1 open/syncd N/A The system is now back to normal. 7.3.2 Recovering an incorrectly removed disk If a disk was incorrectly removed from the system, and the system has been rebooted, the synclvodm command will need to be run to rebuild the logical volume control block, as shown in the following examples. 148 IBM ^ Certification Study Guide - AIX 5L Problem Determination Tools and Techniques
In the examples, a disk has been incorrectly removed from the system and the logical volume control block needs to be rebuilt. The disks in the system before the physical volume was removed is shown in the following command output: # lsdev -Cc disk hdisk0 Available 30-58-00-8,0 16 Bit SCSI Disk Drive hdisk1 Available 30-58-00-9,0 16 Bit SCSI Disk Drive hdisk2 Available 10-60-00-8,0 16 Bit SCSI Disk Drive hdisk3 Available 10-60-00-9,0 16 Bit SCSI Disk Drive The allocation of the physical volumes before the disk was removed are shown as follows: # lspv hdisk0 000bc6fdc3dc07a7 rootvg hdisk1 000bc6fdbff75ee2 volg01 hdisk2 000bc6fdbff92812 volg01 hdisk3 000bc6fdbff972f4 volg01 The logical volumes on the volume group: # lsvg -l volg01 volg01: LV NAME TYPE LPs PPs PVs LV STATE MOUNT POINT logvol01 jfs 1000 1000 2 open/syncd /userfs01 loglv00 jfslog 1 1 1 open/syncd N/A The logical volume distribution on the physical volumes is shown using the lslv command: # lslv -l logvol01 logvol01:/userfs01 PV COPIES IN BAND DISTRIBUTION hdisk1 542:000:000 19% 109:108:108:108:109 hdisk3 458:000:000 23% 109:108:108:108:025 The system after a reboot has the following physical volumes: # lspv hdisk0 000bc6fdc3dc07a7 rootvg hdisk1 000bc6fdbff75ee2 volg01 hdisk3 000bc6fdbff972f4 volg01 When trying to mount the file system on the logical volume, the error may look similar to the following example: # mount /userfs01 mount: 0506-324 Cannot mount /dev/logvol01 on /userfs01: There is an input or output error. Chapter 7. LVM, file system, and disk problem determination 149
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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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*prevthread:0xe6000000 *nextthread:
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In this example, the VMM return cod
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The snap command syntax is as follo
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Page 180 and 181: ► Understanding enhanced journale
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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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232 IBM ^ Certification Study Guide
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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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