IBM System Storage DS4000, Руководство по техническому обслуживанию аппаратной части, Страница: 98 / 184

Tray ID switch
The Tray ID switch settings range from 0 through 7, and unique IDs
ranging from 00 through 77 can be set.
Note: For controller firmware version 05.33.xx.xx, both host and expansion ports
operate at 2 Gbps only. For controller firmware version 05.4x.xx.xx, the host
ports can operate at either 1 or 2 Gbps (the expansion port speed is still
locked at 2 Gbps only).
Diagnostics
To diagnose fibre channel problems, use FAStT MSJ (see the IBM TotalStorage
DS4000 Problem Determination Guide ).
To diagnose problems on the Type 1722 storage system, use the following
diagnostic tools:
v
Storage management software
v System LEDs
Monitoring status through software
Use the storage management software to monitor the status of the storage server.
Run the software constantly, and check it frequently.
The storage management software provides the best way to diagnose and repair
storage server failures. The software can help you:
v
Determine the nature of the failure
v Locate the failed component
v
Determine the recovery procedures to repair the failure
Although the storage server has fault LEDs, these lights do not necessarily indicate
which component failed or needs to be replaced, or which type of recovery
procedure you must perform. In some cases (such as loss of redundancy in various
components), the fault LED does not turn on. Only the storage management
software can detect the failure.
For example, the recovery procedure for an IBM Predictive Failure Analysis
®
(PFA)
flag (impending drive failure) on a drive varies depending on the drive status (hot
spare, unassigned, RAID level, current logical drive status, and so on). Depending
on the circumstances, a PFA flag on a drive can indicate a high risk of data loss (if
the drive is in a RAID 0 volume) or a minimal risk (if the drive is unassigned).
Only the storage management software can identify the risk level and provide the
necessary recovery procedures.
Note: For PFA flags, the General-system-error LED and Drive fault LEDs do not
turn on, so checking the LEDs will not notify you of the failure, even if the
risk of data loss is high.
Recovering from a storage server failure might require you to perform procedures
other than replacing the component (such as backing up the logical drive or failing
a drive before you remove it). The storage management software gives these
procedures.
Attention: You might lose data if you do not follow the software recovery
procedures.
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IBM TotalStorage DS4000: Hardware Maintenance Manual