Rebuild Feature - NEC Express5800 series User Manual

50 Operation

3.6 Rebuild Feature

The rebuild feature can recovers a degraded array. Before the feature can be used, the defected hard
disk drive must be replaced with a normal hard disk drive.
The rebuild can be done in the following three ways.
[Hot-swap rebuild]:
This method provides rebuild by replacing a hard disk drive defected during system operation with a
normal hard disk drive.
[Hot-spare rebuild]:
This method previously creates a hot-spare disk and starts rebuild by using the spare disk
automatically when a hard disk drive is defected.
Hot-spare disks include the following two types.
Global Hot-spare
Hot-spare disks of the type are used to operate for all arrays.
Dedicated Spare
Hot-spare disks of the type are used to operate for specified arrays.
[Rebuild from MSM]:
The feature starts rebuild by selecting [Rebuild] displayed by right-clicking the defected hard disk
drive. Because the feature uses the defected hard disk drive to try array recovery, the rebuild may fail
or the array may be degraded immediately after it can be recovered.
Accordingly, it cannot secure the operation after the rebuild.
The hot-swap and hot-spare rebuild operations are described below.
NOTES:
Do not use the hot-swap feature during array rebuild
To enable rebuild, the disk capacity of the new hard disk
operation.
drive should be equal to or larger than the disk capacity of
the defected hard disk drive.