IBM 866011U - Netfinity 5500 - 8660, Hardware Maintenance Manual

Page: 137 / 402

After you correct a disk-array problem, you might want to
clear the Device Event Log so that you can quickly identify
any subsequent errors.
To clear the Device Event Log:
1. Start the ServeRAID Configuration program (see
“Starting the ServeRAID Configuration program” on
page 77).
2. Select Rebuild/Device Management from the Main
Menu; then, press Enter.
3. Select Erase Device Event Log from the next menu;
then, press Enter to clear the log.
Replacing a faulty drive:
To avoid the loss of critical
data, it is important that you replace and rebuild a defunct
(DDD) drive promptly.
The results of hard disk drive failures depend on the
configuration of the disk arrays and the number of drives
that fail. Before you remove or replace a DDD drive,
review the following examples.
Example 1. One hard disk drive becomes defunct,
but a hot-spare (HSP) drive of the same size exists.
Ÿ
If the failing drive is part of a redundant (RAID
level 1 or RAID level 5) logical drive, the
hot-spare drive takes over immediately.
Ÿ
RAID level 1 and RAID level 5 logical drives
within the array change to the critical (CRT) state
and remain in the CRT state until the rebuild
process completes.
Ÿ
The RAID level 0 logical drives within the array
change to the offline (OFL) state.
Ÿ
All data in the RAID level 0 logical drives within
the array is lost.
Example 2. One hard disk drive becomes defunct,
and an appropriate hot-spare (HSP) drive is not
available.
Ÿ
The RAID level 1 and RAID level 5 logical drives
change to the CRT state and remain in the CRT
state until the rebuild process completes. Data
is not lost from logical drives in the CRT state,
but you must replace the DDD hard disk drive
promptly to avoid the loss of data. (If two drives
within the same array become DDD, all data
within the array is lost.)
Ÿ
The RAID level 0 logical drives change to the
OFL state.
Ÿ
All data in the RAID level 0 logical drives within
the array is lost.
Example 3. Multiple drives within an array become
defunct.
Ÿ
All logical drives in the array change to the
offline (OFL) state.
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