User's Manual

38 omdiag: Using the Diagnostic Service
• Enclosure Log Test — Enclosures store all historical events in their memory. This test exports the logs
to a readable text file and Comma Separated Value (CSV) files. Entries in the exported log file are
intended for Dell technical support personnel. The messages in the log are informational at the user
level. Using the text or CSV files, Dell support personnel can analyze the logs to identify any potential
failure of the system.
• Disk Self Test — Verifies the hard disks attached to a system through a qualified SAS or RAID
controller to determine if the hard disk has failed.
NOTE: The hard disk diagnostics are designed to run as a low-priority background task to limit the effect on I/O.
Because of their low priority, it is recommended that you limit hard disk activity while running the diagnostics. The
diagnostics may run slowly or even stop while hard disk I/O activity is running simultaneously.
omdiag storage scsidevdiag
Use the omdiag storage scsidevdiag command to test the SCSI controller, connected hard drives, and
tape devices. This test performs the following tests:
• SCSI Channel Communication Test — Ensures that the SCSI subsystem between the controller and
connected device is intact. This test is only available if the controller has devices connected to it.
• SCSI Disk Test — Moves the hard drive heads continuously, starting from the center of the disk and
moving outward to the maximum track, one track at a time, until the entire disk is tested. For a quick
test, this test moves the drive heads to several hundred random locations on the disk, one track
at a time.
• Blink Disk Light — Blinks the lights of a hard drive for 30 seconds to assist in locating the drive.
• SCSI Tape Drive Tests — Performs several tests on the SCSI tape drive, which is connected to a
SCSI controller channel using a SCSI cable. The appropriate tape drive and SCSI controller drivers
must be installed to enumerate the tape drive. The following tests are performed on SCSI tape drives:
– Tape Device Self-Test — Ensures that any media in the drive is writable. For autoloaders/changers,
this test does not require a tape cartridge. For tape drives, a tape cartridge is required as this test
writes data to the media installed in the drive. This test initially verifies the communication path
from the host to the tape drive. If communication can be established, the test performs a quick
test of the drive's RAM and then performs the built-in RAM diagnostic. This diagnostic can vary
depending on the type of the drive. For autoloaders/changers, no other tests are performed. For
tape drives, the diagnostic writes several blocks of data and filemarks on the drive and tests the
drive’s ability to space along the filemarks.
– Tape Drive Media Test — Writes data to media present in the drive. Ensure that any media in the
drive is writable. The quick test will attempt to write 30 percent of the media's capacity and then
space back to the beginning of the media. The data is then read to confirm the written data's
integrity. The data is erased when the test is complete. The full test will attempt to write
80 percent of the media's capacity.
NOTE: Tape tests can take several hours to complete because the tests are proportional to the tape
capacities. Regular tests can take more than ten hours to complete, while the quick test can take up to ten
hours to complete.