SCSI or Interface MAP

SCSI or Interface MAP

Before you start, ensure that the DLT7000 tape drive SCSI IDs, at the rear of the tape library, are the same IDs that the host program expects.
If they are not correct, set the switches to the proper values.
Go to 'End of Call' and rerun the host program.

The SCSI Interface MAP tests and checks the SCSI connections on the tape library and DLT7000 tape drives.
The host-to-library SCSI cable is considered to be part of the host system, and is covered in Step 4.

Turn off the power to the system and disconnect the host-to-tape library SCSI cable at the tape library controller.
In another library or other devices are connected to the tape library on this SCSI bus, disconnect those devices from the tape library as well.
If the tape library being tested does not have terminator, temporarily install one.

Check the drive-to-SCSI cables and the terminator for proper seating or bent pins before proceeding.
If you find a problem, correct or replace the part. Continue with this MAP to verify fix.

Step 1

Is the tape library the only device failing to communicate?
Yes    Verify the tape library SCSI ID (see 'Setup Information' and
     'Setup Procedure', or refer to the right digit on the top line
     of the display panel (this digit is the SCSI tape library ID).:p.
     Is it the same SCSI ID that the host program expects?
     Yes Run the communication test (COMM TEST) and the
      tape drive load and unload test (DRVLDULD) from the tape library
     operator panel.
     See 'Library Excersiser, Diagnostic, and Fix Verify Selections'.
     These tests use the SCSI communications. The library becomes the initiator
     that issues SCSI commands over the bus to the tape drives.
     If the test run without failing, suspect an intermittent problem or
     host-to-library SCSI cable or SCSI adapter problem.
     If one or both tests fail, replace the FRUs in the following order
     (one at a time), and rerun the tests until they run without failing.
      ° Library controller card (see 'Removing and Replacing the Controller')
      ° Drive-to-drive and drive-to-controller SCSI cables
      ° Base tape library (see 'Removing and Replacing a Base Tape Library')
     Go to Step 4.
     If the problem persits, call your next level of support.
     No Set the SCSI ID to the correct value
      (see 'Setup Procedure').
      Go to 'End of Call'. After completion, rerun
      the host program to verify proper operation.
     No Go to Step 2.

Step 2

Is a tape drive (even if two are installed) the only device failing to communicate?
Yes    Run the communication test (COMM TEST) from the operator panel.
     Did the test fail?
     If the tape drive is the last drive on the bus, replace the
     SCSI cable that connects to that drive. Rerun the communication
     test to verify. If the problem persists, replace the tape drive.
     Rerun the communication test to verify the replacement part.
     Also, run the DLT7000 diagnostic (DLT DIAGNOSTIC) from the tape library
     operator panel on the replacement part
     (see 'DLT7000 Tape Drive Diagnostic and Fix Verify Selections').
     Go to 'End of Call'.
     Run the tape drive load and unload test (DRVLDULD) from the tape
     library operator panel.
     See 'Library Exerciser, Diagnostic, and Fix Verify Selections'.
     These tests use the SCSI communications.
     The library becomes the initiator that issues SCSI commands over
     the bus to the tape drives. If the tests run without failing, suspect
     an intermittent problem or host-to-library SCSI cable or SCSI adapter problem.
     Go to Step 4. If the problem persists, call your next level of support.
    No    Go to Step 3.

Step 3

You have indicated a general SCSI problem that affects two or more of the devices on the bus.
Run the communication test from the tape library operator panel to determine if the library and tape drives are communicating over the SCSI bus with the library acting as the initiator.

Did the SCSI communication test fail?
Yes    Replace the drive-to-drive and drive-to-controller SCSI cables and
     terminator. Rerun the Communication Test to verify proper operation.
     If the problem persists, reenter the MAP with a new symptom or call
     the next level of support.
    No    Go to Step 4. The problem does not appear to be with the tape library.
     Ensure that all SCSI cables and the terminator are connected to their
     proper locations.

Step 4
To find system test tools that may be available for the specific operating system or independent software vendor platform that you are using, see Appendix C, 'Accessing the System Error Log (for the RS/6000 Only)'.
Only a select group is listed. Whether you run system tests, the following FRUs or firmware should be considered as problems:

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