AIX 5L Problem Determination - IBM Redbooks

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Flag Description -p Device Temporarily changes the primary dump device to the specified device. The device can be a logical volume or a tape device. For a network dump, the device can be a host name and a path name. -q Suppresses all messages to standard output. If this flag is used with the -l, -r, -z, or -L flag, the -q flag will be ignored. -r Host:Path Frees space used by the remote dump file on server host. The location of the dump file is specified by the path. -s Device Temporarily changes the secondary dump device to the specified device. The device can be a logical volume or a tape device. For a network dump, the device can be a host name and a path name. -z Determines if a new system dump is present. If one is present, a string containing the size of the dump in bytes and the name of the dump device will be written to standard output. If a new system dump does not exist, nothing is returned. After the sysdumpdev -z command is run on an existing system dump, the dump will no longer be considered recent. 5.9.6 The sysdumpstart command The sysdumpstart command provides a command line interface to start a kernel dump to the primary or secondary dump device. When the dump completes, the system halts. Use the crash command to examine a kernel dump. Use the sysdumpdev command to reassign the dump device. The sysdumpstart command syntax is as follows: sysdumpstart { -p | -s [ -f ] } During a kernel dump, the following values can be displayed on the three-digit terminal display as follows: 0c0 Indicates that the dump completed successfully. 0c1 Indicates that an I/O error occurred during the dump. This value only applies to AIX Version 4.2.1 or later. 0c2 Indicates that the dump is in progress. 0c4 Indicates that the dump device is too small. 0c5 Indicates a dump internal error. 0c6 Prompts you to make the secondary dump device ready. This value does not apply for AIX Version 4.2.1 or later. 100 IBM ^ Certification Study Guide - AIX 5L Problem Determination Tools and Techniques
5.10 Quiz 0c7 Indicates that the dump process is waiting for a response from the remote host. 0c8 Indicates that the dump was disabled. In this case, no dump device was designated in the system configuration object for dump devices. The sysdumpstart command halts, and the system continues running. 0c9 Indicates that a dump is in progress. 0cc Indicates that the system switched to the secondary dump device after attempting a dump to the primary device. This value only applies to AIX Version 4.2.1 and later. The sysdumpstart command flags are listed in Table 5-8. Table 5-8 Commonly used flags of the sysdumpstart command Flag Description -f Suppresses the prompt to make the secondary dump device ready. This flag does not apply to AIX Version 4.2.1 or later. -p Initiates a system dump and writes the results to the primary dump device. -s Initiates a system dump and writes the results to the secondary dump device. The following assessment questions help verify your understanding of the topics discussed in this chapter. 1. Using the following error log entries as shown, which of the following conclusions best explains why the system crashed? A. The system crash was caused by a signal 11. B. The calc command caused the system to crash. C. The system crashed due to an invalid inode number. D. The system took a dump to paging space after the calc command core dumped. Chapter 5. System dumps 101
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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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Page 80 and 81: LED 299 A LED code of 299 shows tha
Page 82 and 83: Figure 4-2 Format of the 103 code m
Page 84 and 85: 4.5 Quiz The following assessment q
Page 86 and 87: 4.5.1 Answers 4.6 Exercises The fol
Page 88 and 89: 5.1 Configuring the dump device Pri
Page 90 and 91: 5.2 Starting a system dump A user-i
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Page 98 and 99: 5.4 Increasing the size of the dump
Page 100 and 101: Setting output device to /dev/rmt0.
Page 102 and 103: Look at the time of the dump and th
Page 104 and 105: Failure Causes SOFTWARE PROGRAM Rec
Page 106 and 107: Using crash, you can examine: ► A
Page 108 and 109: ► ? or help[] Lists all subcomman
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Page 112 and 113: DSIRR Data Storage Interrupt Reason
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Page 116 and 117: In this example, the VMM return cod
Page 118 and 119: The snap command syntax is as follo
Page 120 and 121: Flag Description -t Format Lists ea
Page 124 and 125: Figure 5-3 Error log case study 2.
Page 126 and 127: Figure 5-4 Case study Which of the
Page 128 and 129: 5.10.1 Answers 5.11 Exercises The f
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
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Page 148 and 149: Flag Description -k ErrorID[,ErrorI
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7.4 The AIX JFS 7.4.1 Creating a JF
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7.4.2 Increasing the file system si
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In many cases, restoration of the b
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lv02 jfs 2 2 1 open/syncd /u/testfs
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► Understanding enhanced journale
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512 bytes) to minimize internal fra
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Function JFS2 JFS Compression No Ye
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7.4.10 Disk quota Pseudo file name
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home: blocks in use: 0, limits (sof
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7.5.3 Reducing and removing paging
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Table 7-3 Commonly used flag of the
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7.6.4 The rmlvcopy command The rmlv
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Which of the following commands sho
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7.7.1 Answers 7.8 Exercises The fol
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8.1 Network interface problems If h
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As you can see, the output shows th
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3. If there is a default route, att
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If you are using the route command
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address of the named server and try
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TOK: access control field = 0, fram
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4. Initiate an iptrace (client, ser
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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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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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