AIX 5L Problem Determination - IBM Redbooks

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This error information displays the reason why the LV lvdb02 is marked stale. The hdisk4 had an DISK OPERATION ERROR and the LVDD could not write the mirror cache. Based on the information in the example, hdisk4 needs to be replaced. Before taking any action on the physical disk of the mirrored LV are recommended that you do a file system backup in case anything should go wrong. Since the other disk of the mirrored LV is still functional, all the data should be present. If the LV contains a database, then the respective database tools for backup of the data should be used. Removing a bad disk If the system is a high-availability (24x7) system, you might decide to keep the system running while performing the disk replacement, provided that the hardware supports an online disk exchange with hot-swappable disks. However, the procedure should be agreed upon by the system administrator or customer before continuing. Use the following steps to remove a disk: 1. To remove the physical partition copy of the mirrored logical volume from the erroneous disk, use the rmlvcopy command as follows: # rmlvcopy lvdb02 1 hdisk4 The logical volume lvdb02 is now left with only one copy, as shown in the following: # lslv -l lvdb02 lvdb02:/u/db02 PV COPIES IN BAND DISTRIBUTION hdisk3 500:000:000 21% 109:108:108:108:067 2. Reduce the volume group by removing the disk you want to replace from its volume group: # reducevg -f mirrorvg hdisk4 # 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 500 500 1 open/syncd /u/db02 loglv00 jfslog 1 1 1 open/syncd N/A 3. Remove the disk as a device from the system and from the ODM database with the rmdev command: # rmdev -d -l hdisk4 hdisk4 deleted This command is valid for any SCSI disk. If your system is using SSA, then an additional step is required. Since SSA disks also define the device pdisk, the 146 IBM ^ Certification Study Guide - AIX 5L Problem Determination Tools and Techniques
corresponding pdisk device must be deleted as well. Use the SSA menus in SMIT to display the mapping between hdisk and pdisk. These menus can also be used to delete the pdisk device. 4. The disk can now be safely removed from your system. Adding a new disk Continuing the scenario from the previous section, this section describes how to add a new disk into a running environment. After hdisk4 has been removed, the system is now left with the following disks: # 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 Use the following steps to add a new disk: 1. Plug in the new disk and run the configuration manager cfgmgr command. The cfgmgr command configures devices controlled by the Configuration Rules object class, which is part of the device configuration database. The cfgmgr command will see the newly inserted SCSI disk and create the corresponding device. Although the command requires no option, the -v flag specifies verbose output, which helps in troubleshooting, as shown in the following: # cfgmgr -v cfgmgr is running in phase 2 ---------------- Time: 0 LEDS: 0x538 Invoking top level program -- "/etc/methods/cfgprobe -c /etc/drivers/coreprobe.ext" Time: 0 LEDS: 0x539 Return code = 0 *** no stdout **** *** no stderr **** ---------------- Time: 0 LEDS: 0x538 Invoking top level program -- "/etc/methods/defsys" Time: 0 LEDS: 0x539 Return code = 0 ***** stdout ***** sys0 ..... ..... The result is a new hdisk4 added to the system: # lsdev -Cc disk Chapter 7. LVM, file system, and disk problem determination 147
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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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Page 120 and 121: Flag Description -t Format Lists ea
Page 122 and 123: Flag Description -p Device Temporar
Page 124 and 125: Figure 5-3 Error log case study 2.
Page 126 and 127: Figure 5-4 Case study Which of the
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Page 130 and 131: 6.1 The error daemon The error logg
Page 132 and 133: To change the current log file, the
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Page 136 and 137: Flag Description -g Displays the AS
Page 138 and 139: Flag Description -F FlagList Select
Page 140 and 141: Probable Causes ERRDEMON STARTED AU
Page 142 and 143: To display a detailed report of all
Page 144 and 145: USER ID 0 0=SOFT IPL 1=HALT 2=TIME
Page 146 and 147: Resource Class: planar Resource Typ
Page 148 and 149: Flag Description -k ErrorID[,ErrorI
Page 150 and 151: 6.5.1 Setting up an accounting syst
Page 152 and 153: 6.6 The syslogd daemon The syslogd
Page 154 and 155: Use the following message priority
Page 156 and 157: 3. A system operator accidentally d
Page 158 and 159: 6.7.1 Answers 6.8 Exercises The fol
Page 160 and 161: 7.1 LVM data The Logical Volume Man
Page 162 and 163: 7.2.1 Data relocation 7.2.2 Backup
Page 164 and 165: AIX version level Verify that the v
Page 166 and 167: This example shows that the volume
Page 170 and 171: hdisk0 Available 30-58-00-8,0 16 Bi
Page 172 and 173: 7.4 The AIX JFS 7.4.1 Creating a JF
Page 174 and 175: 7.4.2 Increasing the file system si
Page 176 and 177: In many cases, restoration of the b
Page 178 and 179: lv02 jfs 2 2 1 open/syncd /u/testfs
Page 180 and 181: ► Understanding enhanced journale
Page 182 and 183: 512 bytes) to minimize internal fra
Page 184 and 185: Function JFS2 JFS Compression No Ye
Page 186 and 187: 7.4.10 Disk quota Pseudo file name
Page 188 and 189: home: blocks in use: 0, limits (sof
Page 190 and 191: 7.5.3 Reducing and removing paging
Page 192 and 193: Table 7-3 Commonly used flag of the
Page 194 and 195: 7.6.4 The rmlvcopy command The rmlv
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Page 202 and 203: As you can see, the output shows th
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Page 212 and 213: 4. Initiate an iptrace (client, ser
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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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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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