Disabling And Reconstructing The Drive - Sun Microsystems StorEdge T3 Installation, Operation And Service Manual

TABLE 2
Failure or Problem
Battery DC not OK
Host cable
Media Interface Adapter
Host GBIC
Missing FRU
1. Battery discharge may be slightly longer or shorter than 12 minutes.
3.2.4

Disabling and Reconstructing the 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, once the reconstruction has completed, a copy-back operation begins
where the hot spare data is copied to the newly replaced drive.
3-8 Sun StorEdge T3 Disk Tray Installation, Operation, and Service Manual • July 2000
Cache Transition States (Continued)
Write-Behind Cache State
Disable
Enable (LUN failover)
Enable (LUN failover)
Enable (LUN failover)
Disable