IBM 200 GB LTO-2, Руководство пользователя

Страница: 63 / 104

Resolving problems reported by the server
The procedure for fixing SCSI bus errors varies, depending on whether the error is
consistent or intermittent, and whether your configuration contains single or
multiple LTO-2s. The sections that follow describe how to fix each type of error.
Fixing SCSI bus errors
Fixing a consistent error with a single drive on a SCSI bus
1. Ensure that the power is on to the LTO-2.
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 5 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 57).
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 5 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 57).
v If 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.
v
If the problem is with only one tape drive, run the SCSI wrap test on that
tape drive (see Function Code 6 in Table 5 on page 36).
Chapter 5. Resolving problems
53