AIX 5L Problem Determination - IBM Redbooks

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The netstat -m command The netstat -m command displays the statistics recorded by the mbuf memory-management routines. The most useful statistics in the output of the netstat -m command are the counters that show the requests for mbufs denied and non-zero values in the failed column. If the requests for mbufs denied is not displayed, then this must be an SMP system running AIX Version 4.3.2 or later; for performance reasons, global statistics are turned off by default. To enable the global statistics, set the no parameter extended_netstats to 1. This can be done by changing the /etc/rc.net file and rebooting the system. The following example shows the first part of the netstat -m output with extended_netstats set to 1: # netstat -m 426 mbufs in use: 384 mbuf cluster pages in use 1642 Kbytes allocated to mbufs 0 requests for mbufs denied 0 calls to protocol drain routines 0 sockets not created because sockthresh was reached Kernel malloc statistics: ******* CPU 0 ******* By size inuse calls failed delayed free hiwat freed 32 92 187 0 0 36 1440 0 64 33 57 0 0 31 720 0 128 21 227 0 0 11 360 0 256 13 1602 0 0 19 864 0 512 30 125 0 0 2 90 0 1024 12 129 0 0 4 225 0 2048 1 3 0 0 1 225 0 4096 1 7 0 0 3 270 0 8192 2 43 0 0 1 22 0 16384 0 0 0 0 40 54 0 65536 1 1 0 0 0 2047 0 ******* CPU 1 ******* By size inuse calls failed delayed free hiwat freed 32 87 313 0 0 41 1440 0 64 17 191 0 0 47 720 0 128 17 311 0 0 15 360 0 256 60 2497 0 0 20 864 0 512 62 406 0 0 10 90 0 1024 24 139 0 0 4 225 0 2048 1 3 0 0 1 225 0 268 IBM ^ Certification Study Guide - AIX 5L Problem Determination Tools and Techniques
4096 1 69 0 0 50 270 0 8192 0 42 0 0 2 22 0 16384 1 1 0 0 40 54 0 ******* CPU 2 ******* By size inuse calls failed delayed free hiwat freed 32 31 335 0 0 97 1440 0 64 23 157 0 0 41 720 0 128 21 180 0 0 11 360 0 256 26 2593 0 0 22 864 0 512 39 350 0 0 1 90 0 1024 18 150 0 0 10 225 0 2048 1 7 0 0 1 225 0 4096 0 7 0 0 1 270 0 8192 1 48 0 0 2 22 0 16384 0 0 0 0 40 54 0 ******* CPU 3 ******* By size inuse calls failed delayed free hiwat freed 32 43 188 0 0 85 1440 0 64 49 109 0 0 15 720 0 128 30 370 0 0 34 360 0 256 396 2483 0 0 84 864 0 512 26 186 0 0 6 90 0 1024 9 151 0 0 7 225 0 2048 386 390 0 0 2 225 0 4096 1 135 0 0 63 270 0 8192 0 32 0 0 2 22 0 16384 0 0 0 0 40 54 0 By type inuse calls failed delayed memuse memmax mapb mbuf 426 6738 0 0 109056 125440 0 mcluster 384 520 0 0 786432 1068032 0 socket 280 1767 0 0 106272 121664 0 pcb 93 713 0 0 15552 15808 0 routetbl 19 0 0 0 2336 3488 0 ifaddr 16 0 0 0 1792 1792 0 mblk 9 2168 0 0 1280 3584 0 mblkdata 31 233 0 0 38912 41216 0 strhead 19 64 0 0 6368 6368 0 strqueue 35 165 0 0 17920 17920 0 strmodsw 24 6 0 0 1536 1536 0 strosr 0 13 0 0 0 256 0 strsyncq 42 432 0 0 4864 4928 0 streams 167 211 0 0 25312 25312 0 devbuf 1 0 0 0 256 256 0 kernel tablemoun 16 15 0 0 85344 87392 0 Chapter 10. Performance problem determination 269
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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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Page 256 and 257: Figure 10-1 General performance tun
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Page 330 and 331: 11.1 Overview 11.1.1 Terminology 11
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11.5 Quiz Flag Description -f Check
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320 IBM ^ Certification Study Guide
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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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