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AIX Version 4.3 Commands Reference, Volume 2

diag Command


Performs hardware problem determination.


diag [ [ -a]  |  [ [  -c ] [-d Device] [ [-e]  |   [-v] ] [-A]  ]  ]  |   [ -B ]  |  [-S testsuite ]


The diag command is the starting point to run a wide choice of tasks and service aids. Most of the tasks/service aids are platform specific. The following tasks and service aids are available:

You can use the Web-based System Manager Devices application (wsm devices fast path) to run this command. You could also use the System Management Interface Tool (SMIT) smit diag fast path to run this command.


Note: Most users do not need to use any flags since the diag command is a menu driven program.
-a Processes any changes in the hardware configuration by asking if missing resources have been removed, turned off, and so on.
-B Instructs diagnostics to run the base system test. Error log analysis will also be done on areas in the base system that supports error log analysis.
-c Indicates that the machine will not be attended. No questions will be asked. Results are written to standard output.
-d Device Specifies the device to run diagnostics on.
-e Performs error log analysis if supported on the selected device. No tests are performed. Must be used with the -d flag.
-v Runs diagnostics in System Verification Mode, no error log analysis performed. The default is Problem Determination mode, which tests the device and runs error log analysis.
-A Specifies Advanced mode.
-S testsuite Indicates a particular Test Suite of devices to test:
  1. Base System
  2. I/O Devices
  3. Async Devices
  4. Graphic Devices
  5. SCSI Devices
  6. Storage Devices
  7. Commo Devices
  8. Multimedia Devices


Access Control: Only the root user can run this command.

Privilege Control: System group.


To run diagnostics on the scdisk0 device, without questions, enter:

diag -d scdisk0 -c


/usr/sbin/diag Contains the diag command.

Related Information

Symptom Index in AIX Version 4.3 Problem Solving Guide and Reference.

Setting up and running Web-based System Management in AIX Version 4.3 System Management Guide: Operating System and Devices.

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