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Resolving Problems Reported by the Server
The procedure for fixing SCSI bus or Fibre Channel errors varies, depending on
whether the error is consistent or intermittent, and whether your configuration
contains single or multiple Ultrium 2 Tape Drives. The sections that follow describe
how to fix each type of error.
Fixing SCSI Bus Errors
Note: If you are using a Storage Area Network (SAN) Data Gateway to convert a
drive with a SCSI interface to a Fibre Channel interface, ensure that the
problem is occurring between the SAN Data Gateway and the drive by
running the SCSI wrap test on the drive and running the SCSI loopback test
on the SAN Data Gateway. (To run the SCSI wrap test, see Function Code 6
in Table 9 on page 36; to run the SCSI loopback test, refer to the section
about that test in the IBM Storage Area Network Gateway Module Setup,
Operator, and Service Guide.) If you are using a Fibre Channel drive and are
having problems, see “Fixing Fibre Channel Errors” on page 79.
Fixing a Consistent Error with a Single Drive on a SCSI Bus
1. Ensure that the power is on to the Ultrium 2 Tape Drive.
2. Ensure that the tape drive’s SCSI address is the same as the SCSI address
assigned by the server.
3. Run the SCSI wrap test (see Function Code 6 in Table 9 on page 36).
v If the test runs successfully, replace the SCSI terminator first, then the SCSI
cable and the interposer (if installed). Repeat the operation that caused the
error. If you replaced the SCSI terminator or SCSI cable and the problem
persists, the fault is with the server’s hardware or software. To isolate the
cause of the failure, refer to the server’s service documentation.
v If the test fails, replace the tape drive (see “Removing a SCSI Tape Drive
from an Enclosure” on page 83).
Fixing a Consistent Error with Multiple Drives on a SCSI Bus
When a consistent error occurs in a configuration that has multiple tape drives on
the SCSI bus, you must determine if the problem exists with more than one tape
drive. If the problem is with all of the devices on the SCSI bus, the bus is stuck in a
SCSI phase and cannot change to another phase or the SCSI cable from the server
to the first device is defective.
1. Ensure that the SCSI cable from the server to the first device is connected.
2. Disconnect all but the first tape drive on the SCSI bus. Move the terminator to
the first SCSI device.
3. Run a device driver utility (such as IBM’s ntutil or tapeutil) to determine whether
the error will occur.
v If the error occurs, run the SCSI wrap test on the first 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 and the interposer (if installed) to the first tape drive. Repeat
the operation that caused the error. If you replaced the SCSI terminator or
SCSI cable and the problem persists, the fault is with the server’s
hardware or software. To isolate the cause of the failure, refer to the
server’s service documentation.
– If the test fails, replace the tape drive (see “Removing a SCSI Tape Drive
from an Enclosure” on page 83).
Chapter 6. Resolving Problems 77