AIX 5L Problem Determination - IBM Redbooks

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5.1 Configuring the dump device Prior to AIX Version 4.1, the default dump device is /dev/hd7. In AIX versions after 4.1, the default dump device is /dev/hd6, which is the default paging space logical volume (/dev/pagingnn for dumps). The secondary dump device is /dev/sysdumpnull. Once the system is booted, this image is copied from /dev/hd6 to the directory /var/adm/ras. AIX 5L Version 5.1 servers with a real memory size larger than 4 GB will, at installation time, have a dedicated dump device created. This dump device is automatically created and no user intervention is required. The default name of the dump device is lg_dumplv. The current dump configuration can be determined by running the sysdumpdev command as follows: # sysdumpdev primary /dev/hd6 secondary /dev/sysdumpnull copy directory /var/adm/ras forced copy flag TRUE always allow dump FALSE dump compression OFF The primary dump devices must always be in the root volume group for permanent dump devices. The secondary device may be outside the root volume group unless it is a paging space. Note: Do not use a mirrored or copied logical volume as the active dump device. Carefully check your AIX release to see if this function is available. System dump error messages will not be displayed, and any subsequent dumps to a mirrored logical volume will fail. Do not use a diskette drive as your dump device. AIX Version 4.2.1 and later supports using any paging device in the root volume group (rootvg) as the secondary dump device. The sysdumpdev command can be used to configure remote dump devices. The following conditions must be met before a remote dump device can be configured: ► The local and the remote host must have Transmission Control Protocol/Internet Protocol (TCP/IP) installed and configured. ► The local host must have the Network File System (NFS) installed. ► The remote host must support NFS. 66 IBM ^ Certification Study Guide - AIX 5L Problem Determination Tools and Techniques
► The remote host must be operational and on the network. This condition can be tested by issuing the ping command. ► The remote host must have an NFS exported directory defined such that the local host has read and write permissions as well as root access to the dump file on the remote host. ► The remote host cannot be the same as the local host. To change a primary dump device permanently, use the sysdumpdev command as follows: # sysdumpdev -P -p /dev/hd3 primary /dev/hd3 secondary /dev/sysdumpnull copy directory /var/adm/ras forced copy flag TRUE always allow dump FALSE dump compression OFF This will remain the permanent dump device until it is changed again with the sysdumpdev command. To change the secondary device permanently, use the sysdumpdev command as follows: # sysdumpdev -P -s /dev/rmt0 primary /dev/hd3 secondary /dev/rmt0 copy directory /var/adm/ras forced copy flag TRUE always allow dump FALSE dump compression OFF To temporarily change the primary device to another device, use the sysdumpdev command as follows: # sysdumpdev -p /dev/rmt0 primary /dev/rmt0 secondary /dev/sysdumpnull copy directory /var/adm/ras forced copy flag TRUE always allow dump FALSE dump compression OFF This will temporarily change the primary dump device to /dev/rmt0 until the next system reboot. Chapter 5. System dumps 67
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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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Page 40 and 41: Figure 3-3 Task selection menu in d
Page 42 and 43: 3.2.2 PCI systems next step is to s
Page 44 and 45: 3.3 Boot phase 1 Newer PCI architec
Page 46 and 47: 3.4 Boot phase 2 In boot phase 2, t
Page 48 and 49: As mentioned, there are a lot of di
Page 50 and 51: 3.4.3 LED 518 product documentation
Page 52 and 53: Figure 3-9 Boot phase 3 /etc/initta
Page 54 and 55: 3.5.2 LED 553 3.5.3 LED c31 3.5.4 L
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Page 58 and 59: When the system is gracefully shut
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Page 62 and 63: 3. A file system is being mounted b
Page 64 and 65: 3.9.1 Answers 3.10 Exercises The fo
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Page 68 and 69: The most important fields in the pr
Page 70 and 71: Figure 4-1 Main diagnostics menu Th
Page 72 and 73: ► Full testing requires that the
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Page 76 and 77: Note: This service aid is only pres
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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 90 and 91: 5.2 Starting a system dump A user-i
Page 92 and 93: A command status screen will be dis
Page 94 and 95: If the system does not have a key s
Page 96 and 97: The shconf command is invoked when
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 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
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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Flag Description -F FlagList Select
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Probable Causes ERRDEMON STARTED AU
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To display a detailed report of all
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USER ID 0 0=SOFT IPL 1=HALT 2=TIME
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Resource Class: planar Resource Typ
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Flag Description -k ErrorID[,ErrorI
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6.5.1 Setting up an accounting syst
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6.6 The syslogd daemon The syslogd
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Use the following message priority
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3. A system operator accidentally d
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6.7.1 Answers 6.8 Exercises The fol
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7.1 LVM data The Logical Volume Man
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7.2.1 Data relocation 7.2.2 Backup
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AIX version level Verify that the v
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This example shows that the volume
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This error information displays the
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hdisk0 Available 30-58-00-8,0 16 Bi
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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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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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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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