Chapter 9
Post-Installation Array Settings Configuration
131
Disabling and Reconstructing a Drive
If a drive fails, it is automatically disabled by the system. This prevents any further
access to the drive. The data on the drive is available by reconstructing it using
RAID redundancy data in the volume. When a drive is disabled, the volume is
operating without any further redundancy protection, so the failed drive needs to be
replaced as soon as possible.
If the volume has a hot-spare configured and that drive is available, the data on the
disabled drive is reconstructed on the hot-spare drive. When this operation is
complete, the volume is operating with full redundancy protection, so another drive
in the volume may fail without loss of data.
After a drive has been replaced, the original data is automatically reconstructed on
the new drive. If no hot-spare was used, the data is regenerated using the RAID
redundancy data in the volume. If the failed drive data has been reconstructed onto
a hot-spare, After the reconstruction has completed, a copy-back operation begins
during which the hot-spare data is copied to the newly replaced drive.
Interconnect card 2
Disabled
Interconnect card 1+2
Disable (system down)
Controller
Disable (controller failover)
Battery
Disabled
Battery warranty expires
Disabled
Battery refresh
Disable (hold time low)
28-day battery refresh
Disable (during 12-minute battery discharge)
1
Power and cooling unit 1
Disabled
Power and cooling unit 2
Disabled
Power and cooling unit 1+2
Disable (system down)
Battery DC not OK
Disabled
Host cable
Enable (LUN failover)
Media Interface Adapter
Enable (LUN failover)
Host GBIC
Enable (LUN failover)
Missing FRU
Disabled
1. Battery discharge may be slightly longer or shorter than 12 minutes.
TABLE 9-2
Cache Transition States (Continued)
Failure or Problem
Write-Behind Cache State
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