AIX 5L Problem Determination - IBM Redbooks

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International Technical Support Organization IBM ^ Certification Study Guide - AIX 5L Problem Determination Tools and Techniques January 2003 SG24-6185-01
Page 1: ibm.com/redbooks IBM Certification
Page 5 and 6: Contents Figures . . . . . . . . .
Page 7 and 8: 5.2.5 System Hang Detection . . . .
Page 9 and 10: 8.4.2 NFS mount problems . . . . .
Page 11 and 12: 10.8.3 The netstat command . . . .
Page 13 and 14: Figures 3-1 General boot order. . .
Page 15 and 16: Tables 3-1 Common MCA LED codes . .
Page 17 and 18: Notices This information was develo
Page 19 and 20: Preface The AIX and IBM ^ pSeries C
Page 21 and 22: John Agombar IBM U.K Greg Althaus I
Page 23 and 24: Chapter 1. Certification overview 1
Page 25 and 26: AIX 5L Performance and System Tunin
Page 27 and 28: k. Use ipc commands for managing IP
Page 29 and 30: Chapter 2. Customer relations The f
Page 31 and 32: The following questions should be a
Page 33 and 34: 2. A user explains that a problem w
Page 35 and 36: Chapter 3. Booting problem determin
Page 37 and 38: 3.2 BIST - POST 3.2.1 MCA systems N
Page 39 and 40: Changes to the bootlist can also be
Page 41 and 42: At this point, a lot of things can
Page 43 and 44: main menu from an RS/6000 Model 43P
Page 45 and 46: Figure 3-6 Boot phase 1 During this
Page 47 and 48: 4. After this, rootvg’s primary p
Page 49 and 50: ► A hard disk in the inactive sta
Page 51 and 52: 3.5 Boot phase 3 Assuming that you
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always time to read all of the mess
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A problem is when the system hangs
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form Exxx are displayed. E105, the
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Boot phase 3 (init /sbin/rc.boot 3)
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3.8.2 The w command 3.9 Quiz The w
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6. A system was running fine until
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Chapter 4. Hardware problem determi
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proc1 Available 00-01 Processor pro
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The method you use to run diagnosti
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After you have selected the level o
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Once the keyboard input has been pr
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The results returned are: ► The e
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4.3.2 SSA devices The maximum numbe
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Note: The cfgmgr command should not
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The reason code is the second value
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4.4.1 The chdev command The chdev c
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Figure 4-3 Case study 5. A mirrored
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Chapter 5. System dumps 5 In this c
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► The remote host must be operati
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This command starts a system dump o
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Ensure that the always allow dump o
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Table 5-1 REMOTE reboot ENABLE sett
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unexpected error. Complete the Prob
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► The remote host must support NF
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-rw------- 0 0 2555 Jul 12 15:40:21
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5.8 Core dumps When a system encoun
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The strings command will give the f
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The crash command uses the kernel f
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xmalloc debug: disabled dump code:
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*exp:0x04e0e000 *lex:0x00000000 *de
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active:1 suspended:0 local:0 termin
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For example: > od vmker 15 000bde48
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5.9.2 Types of crashes Common probl
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Flag Description -oOutputDevice Cop
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Commonly used sysdumpdev command fl
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5.10 Quiz 0c7 Indicates that the du
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3. After a legacy microchannel syst
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10.Which of the following codes bes
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Chapter 6. Error reports 6 AIX reco
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Flag Description -s LogSize Uses th
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Note: The errpt command does not pe
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Flag Description -d ErrorClassList
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Flag Description -j ErrorID[,ErrorI
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Flag Description -S ResourceClassL
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Description UNABLE TO ALLOCATE SPAC
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6.3.1 Error classes The Error Notif
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0000 0000 0000 0000 0000 0000 0000
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6.4 The errclear command The errcle
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To delete all entries from the erro
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9. To submit the edited cron file,
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Each entry in the /etc/syslog.conf
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6.7 Quiz size This keyword specifie
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8. Which of the following options i
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Chapter 7. LVM, file system, and di
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7.1.3 Logical volumes In contrast,
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ODM corruption can also occur if an
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Check the error log with the errpt
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Figure 7-1 Disk problem mail from A
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corresponding pdisk device must be
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In the examples, a disk has been in
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Figure 7-2 JFS organization AIX Ver
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Fixing a bad superblock If you rece
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The following situations can leave
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► Specifying file system block si
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The kernel allocates disk space so
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5.2.0.0 COMMIT COMPLETE 09/12/02 17
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files are read-only, but some of th
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Setting up the disk quota In the fo
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Do not extend a paging space logica
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3. Remove the paging00 paging space
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Table 7-4 Commonly used flag of the
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7.6.7 The syncvg command 7.7 Quiz T
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6. Which of the following statement
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Chapter 8. Network problem determin
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# ifconfig en0 en0: flags=e080822 A
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IBM PCI Ethernet Adapter Specific S
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command ping -f (flood ping) requir
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► The host must be reached by a d
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9.3.240.59.44183 > 9.3.240.58.23: .
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and is a query about the IP address
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► Slow mounts from AIX Version 4.
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8.5.3 The ifconfig command The ifco
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Flag Description -I Interface Shows
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4. Which of the following commands
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13.Assume that an AIX workstation h
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Chapter 9. System access and printe
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Figure 9-1 SMIT menu to change the
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(C) Copyrights by IBM and by others
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Figure 9-2 The smitty crjfsbf fast
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User authentication Validates the u
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9.5 Tracing Check that the files ex
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9.5.2 Starting a trace 9.5.3 Trace
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Since this system is a 4-way SMP, t
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From the output of this example, it
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► TTY configuration is corrupted
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9.8.2 Remote printing problem Make
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Action or function System V PowerPC
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► Change the lock files from Powe
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Table 9-5 provides a list of common
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2. When users try to telnet to the
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9.10.1 Answers 9.11 Exercises The f
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Chapter 10. Performance problem det
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10.1 CPU-bound system CPU performan
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0 * * * 0,6 /usr/lib/sa/sa1 & 0 18-
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control, the blocked column (b) in
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The cs column The cs column shows t
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The syncd, X, and dtsession are all
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wait 1032 1033 3105 3105 0 0 wait 1
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If the system has too little memory
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The pi column The pi column details
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10.2.2 The ps command The ps comman
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The TSIZ column Size of text (share
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Priority calculation parameters The
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Figure 10-2 CPU penalty example SCH
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The VMM tries to anticipate the fut
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and pseudo TTY devices. Real TTY de
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The Kb_read column The Kb_read colu
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of times spaced at the specified in
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The count values are summarized sin
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4096 1 69 0 0 50 270 0 8192 0 42 0
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Max Packets on S/W Transmit Queue T
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If the total number of collisions f
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ASCII files. The Web-based System M
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either be a superclass or a subclas
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process belongs to (when not shared
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Tier 0 Tier 1 Figure 10-5 Resources
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Shared. This occurs because one of
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match. This means that the order of
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e excluded by using an exclamation
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process is a match, first in the ru
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10.5.6 rset registry As mentioned p
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Figure 10-11 SMIT panel to add a ne
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Subcommand Description catch Starts
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Subcommand Description e The exit s
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10.7 Summary Clock Interrupt Handle
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Flags Description -l Long listing.
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Which of the following outputs best
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10.9.1 Answers The following are th
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Chapter 11. Software updates 11 Thi
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machine or product. In a standard s
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Figure 11-1 SMIT Software Maintenan
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Figure 11-2 Install and Update Soft
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11.3 Software inventory After all t
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Flag Description -r Rejects an appl
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11.5.1 Answers 11.6 Exercises The f
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Chapter 12. Online documentation 12
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12.1 Installing the Web browser Use
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Figure 12-3 Documentation Library S
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You can invoke the Documentation Li
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12.7 Exercises d. Ensure that the D
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Abbreviations and acronyms ABI Appl
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ELA Error Log Analysis ELF Executab
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LID Load ID LLNL Lawrence Livermore
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RDP Router Discovery Protocol RFC R
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XLF XL Fortran XOM X Output Method
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Related publications IBM Redbooks T
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► IBM TotalStorage http://www.sto
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Index Symbols /dev/mem 83 /etc/expo
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migratepv 53 mkclass 283 mklvcopy 1
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F figures boot phase1 23 boot phase
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common MCA LED code table 19 common
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LED code 551 26 LED code 552 24, 26
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software patch installation 312 sof
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sequential-access read ahead 259 tr
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IBM ^ Certification Study Guide AIX
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