AIX 5L Problem Determination - IBM Redbooks

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Figure 4-1 Main diagnostics menu The first three menu options shown in Figure 4-1 are explained in the following sections. Diagnostic Routines This set of routines is primarily aimed at the operator of the machine. When the diagnostics are run using this option, there will be no prompts to unplug devices or cables, and no wrap plugs are used. Therefore, the testing done by this method is not as comprehensive as the testing performed under Advanced Diagnostics. In some cases, it can produce a No Trouble Found result when there is an actual problem. Advanced Diagnostics Routines This set of routines will run diagnostic tests that will ask you to remove cables, plug and unplug wrap plugs, and use various other items. As a result, the tests run are as detailed as possible. Generally, if you get a No Trouble Found result using Advanced Diagnostics, you can be reasonably certain the devices tested have no hardware defects. Task Selection This section is sometimes referred to as Service Aids. There are many useful tools within this section. The use of this option is discussed in 4.2.4, “Task selection or service aids” on page 52. 48 IBM ^ Certification Study Guide - AIX 5L Problem Determination Tools and Techniques
After you have selected the level of diagnostics you wish to run, you are presented with a menu to select the Problem Determination method or the System Verification method. Problem Determination This selection will run the diagnostic routine and search the AIX error log for any errors posted in the previous 24 hours against the device you are testing. It will then use the sense data from any error log entry for the device being tested in conjunction with the results of the diagnostic testing of the device to produce a Service Request Number (SRN). This method must be used to determine the cause of any machine checks and checkstops on 7025 and 7026 machine types. If you are performing diagnostics more than seven days after the machine check occurred, then you will need to set the system date and time to within seven days of the machine check time stamp. The seven-day period is required when using AIX Version 4.3.1 and later. If you are using AIX Version 4.3.0 or earlier, the system date and time must be within 24 hours of the checkstop entry. System Verification Use this selection if you have just replaced a part or performed a repair action. System verification runs a diagnostic routine on the device but does not refer to the AIX error log, so it reflects the machine’s condition at the time of running the test. You can also use system verification when you just want to run a direct test to a device or whole machine. Concurrent mode provides a way to run diagnostics online to system resources while AIX is up and running and users are logged on. Since the system is running in normal operation, some resources cannot be tested in concurrent mode. The following list shows which resources cannot be tested: ► SCSI adapters used by disks connected to paging devices ► Disk drives used for paging ► Memory ► Processors Depending on the status of the device being tested, there are four possible test scenarios in concurrent mode: ► Minimal testing is used when the device is under the control of another process. ► Partial testing occurs when testing is performed on an adapter or device that has some processes controlling part of it. For example, testing unconfigured ports on an 8-port RS232 adapter. Chapter 4. Hardware problem determination 49
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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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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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To change the current log file, the
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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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USER ID 0 0=SOFT IPL 1=HALT 2=TIME
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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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7.1 LVM data The Logical Volume Man
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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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hdisk0 Available 30-58-00-8,0 16 Bi
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7.4.2 Increasing the file system si
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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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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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8.1 Network interface problems If h
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As you can see, the output shows th
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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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the nfs_max_threads parameter of th
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telnet: connect: A remote host did
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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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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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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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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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Figure 10-10 SMIT panel for rset re
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- A Web server The browser must be
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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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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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System Resource Controller (SRC) 13
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AIX 5L Problem Determination - IBM Redbooks

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