AIX 5L Problem Determination - IBM Redbooks

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10.8.4 The nfsstat command 10.9 Quiz Flags Description -Z { c | i | m | s } Clears the statistics defined by the additional flag -v Statistics for each CDLI The nfsstat command displays statistical information about the Network File System (NFS) and Remote Procedure Call (RPC) calls. The syntax of the nfsstat command is: /usr/sbin/nfsstat [ -c ] [ -s ] [ -n ] [ -r ] [ -z ] [ -m ] The most commonly used flags are provided in Table 10-11. Table 10-11 Commonly used flags of the nfsstat command Flags Description -r Displays RPC information -s Displays server information -c Displays client information The following assessment questions help verify your understanding of the topics discussed in this chapter. 1. A system administrator is experiencing some performance problems. After running the vmstat command, the following output appeared: kthr memory page faults cpu ----- ----------- ------------------------ ------------ ----------r b avm fre re pi po fr sr cy in sy cs us sy id wa 2 0 44298 340 0 0 0 1 2 0 138 360 64 65 30 0 5 2 0 44298 358 0 0 0 1 2 0 138 360 64 65 30 0 5 2 0 44298 358 0 0 0 1 2 0 138 360 64 65 30 0 5 2 0 44298 358 0 0 0 1 2 0 138 360 64 65 30 0 5 2 0 44298 358 0 0 0 1 2 0 138 360 64 65 30 0 5 2 0 44245 358 0 0 0 1 2 0 138 360 64 65 30 0 5 302 IBM ^ Certification Study Guide - AIX 5L Problem Determination Tools and Techniques
Which of the following outputs best describes the cause of the problem? A. The machine is CPU bound. B. The machine needs memory optimized. C. The machine requires more paging space. D. A user program is causing unnecessary paging. 2. Which of the following commands should be used to observe the number of threads in the run queue? A. bf B. iostat C. filemon D. vmstat 3. Which of the following commands should be used to show the percentage of time that any given disk was busy? A. ps B. tprof C. iostat D. vmstat 4. Which WLM command will reload the assignment rules of the current running configuration into the kernel without reloading the class definitions? A. wlmcntrl -u -d config_dir B. wlmcntrl -u -d "" C. wlmcntrl -u config_dir D. wlmcntrl -u -a 5. In general, when the disk utilization exceeds a certain percentage, processes are waiting longer than necessary for I/O to complete because most UNIX processes block (or sleep) while waiting for their I/O requests to complete or be serviced by the interrupt handler. What is that percentage threshold? A. 45 percent B. 60 percent C. 70 percent D. 85 percent Chapter 10. Performance problem determination 303
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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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Flag Description -t Format Lists ea
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Flag Description -p Device Temporar
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Figure 5-3 Error log case study 2.
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Figure 5-4 Case study Which of the
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5.10.1 Answers 5.11 Exercises The f
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6.1 The error daemon The error logg
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To change the current log file, the
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To process a report from the error
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Flag Description -g Displays the AS
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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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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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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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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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