Library Exerciser, Diagnostic, and Fix Verify Selections

Library Exerciser, Diagnostic, and Fix Verify Selections

•  Library Power On Self Test and Initialization
•  Confidence Test
•  Tape Drive Load and Unload Test (DRVLDULD)
•  SCSI Communications Test (COMM TEST)
•  Move Cartridge Test

The following are tape library exercisers and diagnostics that are available in the DIAG OFFLINE mode using the tape library operator panel and control keys.
Before using any of these routines, review the following notices and suggestions to help you with your selection and in your assessment of the tape library functions.

Note: For details about how to invoke these routines, see 'Menu Operations'.

•  Ensure that all host-to-target (especially host-to-tape drive) operations are finished and that all  customer cartridges are returned to their storage cells.
   The tape library and tape drives must be off-line to host Operations.
   Diagnostic tests, such as the DRVLDULD (tape drive load and unload test) and the COMM TEST (SCSI communications test), use the tape library controller as the SCSI  command initiator to the tape drives. If both the host and the tape library controller attempt to initiate SCSI commands, ccnflicts and bus hangs could result.
•  The DRVLDULD test and CONFIDENCE TEST are excellent tests for diagnosing intermittent problems.
•  The CONFIDENCE TEST moves cartridges from one storage cell to another in the tape library.
   The DRVLDULD test moves a tape cartridge from a cell to a tape drive and loads the tape cartridge to the load point.
   While the tape drives are occupied, the DRVLDULD test moves tape cartridges from one cell to another.
  Do not use customer cartridges for these tests. Remove the magazine with the customer's tape cartridges and record the location of the cartndges in  the fixed cells before removing the cartridges.
   The CONFIDENCE TEST can be run using only one tape cartridge.
   The DRVLDULD test requires at least three cartridges: the CE cartridge and two scratch or blank cartridges.
   Both of these tests can run with or without the magazine in place.
   Be sure to return the customer's cartridges to their original locations after the tests are completed.
•  You can use the MOVE CARTRIDGE test to verify that the library can load and unload a tape drive successfully.
•  Be very careful not to select the DLT DIAGNOSTIC test while a customer tape cartridge is in a tape drive.
   The DLT DIAGNOSTIC test is a read/write test that can will overwrite the data on the customer tape cartridge.
•  Some retries of tape library operations are normal and should not be construed as a problem.
   However, more than three retries per operation are excessive, and might indicate a problem.

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