AIX 5L Problem Determination - IBM Redbooks

The results returned are:
► The exerciser transmitted a SCSI inquiry command and did not receive any
response back. Ensure that the address is valid, then try this option again.
► The exerciser transmitted a SCSI inquiry command and received a valid
response back without any errors being detected.
► A check condition was returned from the device.
To run this service aid, perform the following steps:
1. From the Task Selection menu, select SCSI Bus Analyzer.
2. Next, select the adapter that has the device that you wish to test attached to
it.
3. Use the Tab key to increment the SCSI ID field to the number you want to
test.
4. Press F7 to confirm your selection.
5. Press Enter to commence the test.
If the device is working correctly, an affirmative system message should be
returned almost instantly. If there is a problem, it should return an answer after a
few seconds. Sometimes a device that has a severe check condition will hang
the service aid. If this is the case, press Ctrl+C to exit from the service aid.
Disk maintenance
The disk-to-disk copy will only work with SCSI disks that pass diagnostics and
ideally have minimal errors when the certify process is run. If the error rate is too
high when a disk-to-disk copy is being run, the program will fail. You will find it
useful if the customer situation is such that they have no backup and the disk is
unstable but running. Disk-to-disk copy differs from an AIX-based migrate
operation because it does not alter the source disk when finished, as the
migratepv command does. Disk-to-disk copy is best run from CD-ROM
diagnostics, which requires you to have the exclusive use of the machine while
the disk copying takes place. Also, the disk to be copied to must not be smaller or
more than 10 percent larger in size than the source disk. The copied disk will
have the same PVID as the original, so the defective disk must be removed from
the machine before starting AIX.
SSA service aids
This service aid can be used to help diagnose SSA subsystem problems. It is
also used to physically identify and control SSA disks in the tower or drawer. This
function greatly speeds the locating of specific disks, especially in very large
installations.
Chapter 4. Hardware problem determination 53