IBM T400F manual Fixing an Intermittent Error with a Single Drive on a SCSI Bus

vIf the error does not occur, connect one tape drive at a time back to the bus and repeat step 3 for each tape drive until you can identify which drive is defective.

Note: Ensure that the SCSI terminator is always on the last tape drive on the SCSI bus.

4.Determine if the problem is with only one tape drive or with two or more tape drives.

vIf the problem is with only one tape drive, run the SCSI wrap test on that tape drive (see Function Code 6 in Table 9 on page 36).

–If the test runs successfully, replace the SCSI terminator first, then the SCSI cable to that tape drive and interposer (if installed).

–If the test fails, replace the tape drive (see “Removing a SCSI Tape Drive from an Enclosure” on page 83).

vIf the problem is with two or more tape drives, locate the first tape drive that has the error and replace the SCSI cable that connects the tape drive and the interposer (if installed).

Fixing an Intermittent Error with a Single Drive on a SCSI Bus

1.Replace the SCSI terminator on the tape drive.

2.Run the operation that caused the error. If the problem persists, the problem may be with the cable.

3.Isolate which cable is causing the problem by replacing one cable at a time and running the operation that caused the error after each replacement. If the problem persists after all cables have been replaced, the problem may be with the Ultrium 2 Tape Drive.

4.Replace the tape drive (see “Removing a SCSI Tape Drive from an Enclosure”

on page 83). If the problem persists, the problem is with your server. Consult your server’s documentation.

Fixing an Intermittent Error with Multiples Drives on a SCSI Bus

Refer to the server’s error logs to determine which tape drive is the source of the problem:

vIf only one tape drive is reporting a SCSI failure, replace that tape drive (see “Removing a SCSI Tape Drive from an Enclosure” on page 83).

vIf multiple tape drives are reporting SCSI failures, the problem may be with the terminator or the SCSI cables:

–Replace the terminator and run the operation that caused the error. If the problem persists, the problem may be with the cables.

–Isolate which cable is causing the problem by replacing one cable at a time and run the operation that caused the error after each replacement.

78IBM TotalStorage LTO Ultrium 2 Tape Drive