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Procedure 3: Verifying SCSI Address Switch Position
If your server is not communicating with the drive, the drive's SCSI address switch
may be set incorrectly:
1. Check the SCSI address switch ( 3 in Figure 4 on page 3) to ensure that it is
2. Make sure that the ID is not one that is used by another device or the SCSI
3. If you change a SCSI ID, power cycle the drive to effect the change.
Procedure 4: Checking SCSI Connections
If your server is not communicating with the drive, the SCSI cable or terminator
connector pins may be damaged or not seated correctly, or the SCSI bus length
may be incorrect.
1. Check whether the SCSI ID is unique. If not, select a unique SCSI ID and
2. Check whether the parameters for the SCSI adapter installation are correct.
3. Ensure that a SCSI terminator is attached to each end of the bus (one
4. Ensure that no more than two bus terminations (typically, one on the host
5. Limit the number of devices on the bus.
6. Check that the SCSI connectors are properly seated (this includes the interposer
7. If communication still fails, check all connector pins for damage. Remove the
8. If communication still fails, check the length of the SCSI bus cable. If your
9. If communication still fails, run the SCSI wrap test (see "Function Code 6: Run
set to the SCSI ID chosen in "Set the SCSI ID" on page 9.
host adapter (note that because ID 7 is the highest priority ID on the SCSI bus,
it is usually reserved for the primary SCSI host adapter).
reconfigure the system. The new ID is effective at the next power-on.
terminator is usually installed at the server).
adapter and one at the last device on the bus) are present.
[if used], terminator, and cable connectors). Push the connectors into their
receptacle connectors, and (if applicable) tighten the retention screws until
firmly seated. Then, retry the operation.
interposer, terminator, and cable connectors, and inspect them for bent,
recessed, or missing pins. If necessary, replace the damaged component and
ensure that all connectors are properly seated, then retry the operation.
drive is the only device on the SCSI bus, ensure that the total bus length does
not exceed 25 m (82 ft). If there are other devices on the bus, ensure that the
total length does not exceed 12 m (39 ft).
SCSI Wrap Test" on page 74). If the test succeeds, the problem may be with the
cables or SCSI host adapter. Refer to your server's documentation and exercise
a host utility to isolate the location of the problem. If the SCSI wrap test fails,
replace the terminator and run the test again.
47
Troubleshooting
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