procedure that 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 a
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 RAID storage controller failure
might require you to perform procedures other than replacing the component
(such as backing up the logical drive or failing a drive before removing it).
The storage-management software gives these procedures.
Attention:
Not following the software-recovery procedures can result in data loss.
Checking the LEDs
The LEDs display the status of the IBM NAS 300 components. Green LEDs indicate
a normal operating status; amber LEDs indicate a possible failure.
It is important to check all the LEDs on the front and back of the components when
you turn on the power. In addition to checking for faults, you can use the LEDs on
the front of the storage server to determine if the drives are responding to I/O
transmissions from the network.
See the following diagram and Table 8 for information about the front-panel LEDs.
Drive activity LED
Hot-swap
drive CRU
Tray handle
Latch
Drive fault LED
Power-on LED
General-system-
error LED
For information about rear-panel LEDs, see:
v
Table 9 on page 37
v
Table 10 on page 39
v
Table 11 on page 39
Table 8. LEDs located on front panel of a RAID storage controller
LED
Color
Operating states
1
36
IBM NAS 300 Service Guide
Summary of Contents for TotalStorage NAS 300
Page 1: ...IBM TotalStorage Network Attached Storage 300 Model 325 Service Guide ...
Page 2: ......
Page 3: ...IBM TotalStorage Network Attached Storage 300 Model 325 Service Guide ...
Page 76: ...66 IBM NAS 300 Service Guide ...
Page 130: ...120 IBM NAS 300 Service Guide ...
Page 136: ...126 IBM NAS 300 Service Guide ...
Page 140: ...130 IBM NAS 300 Service Guide ...
Page 144: ...134 IBM NAS 300 Service Guide ...
Page 150: ...140 IBM NAS 300 Service Guide ...
Page 176: ...166 IBM NAS 300 Service Guide ...
Page 196: ...186 IBM NAS 300 Service Guide ...
Page 197: ...Appendix I Notices 187 ...
Page 198: ...188 IBM NAS 300 Service Guide ...
Page 199: ...Appendix I Notices 189 ...
Page 200: ...190 IBM NAS 300 Service Guide ...
Page 201: ...Appendix I Notices 191 ...
Page 214: ...204 IBM NAS 300 Service Guide ...
Page 222: ...212 IBM NAS 300 Service Guide ...
Page 226: ...216 IBM NAS 300 Service Guide ...
Page 229: ......