Hot Spare Feature - NEC NF2300-SR412E User Manual

2.1

Hot Spare Feature

Spare disks can be installed in the disk array unit. If a disk drive in the same FC loop as
the spare disk, the data in the defective disk drive is recovered in the spare disk. After the
data recovery, the disk array drive operates normally if another disk drive is defected
(except for RAID level 0). A defective disk drive can be replaced without turning off the
power of the disk array unit.
With the setting at the shipment, if the disk drive defected during the operation by using
the spare disk is replaced with a normal disk drive, the data is immediately repaired from
the spare disk to the normal disk drive.
Example of hot spare operation
DRV14
DRV13
DRV12
DRV11
DRV10
DRV9
DRV8
DRV7
DRV6
DRV5
DRV4
DRV3
DRV2
DRV1
DRV0
Failure in DRV1
* DRV: Disk drive
LDN: Logical Disk Number
Spare disk
→
LDN0 RAID5
The setting of the spare disk is invalid in RAID level 0. Use the spare disk in
RAID level 1, 5, or 10.
Do not move any of the factory-installed disk drives into another slot.
DRV14
DRV13
DRV12
DRV11
DRV10
DRV9
→
DRV8
DRV7
DRV6
DRV5
DRV4
DRV3
LDN0 RAID5
DRV2
DRV1
DRV0
Recovery of data
in spare disk
9
Spare disk
DRV14
DRV13
DRV12
DRV11
DRV10
DRV9
DRV8
DRV7
DRV6
DRV5
DRV4
DRV3
LDN0 RAID5
DRV2
DRV1
DRV0
Replacement of DRV 1
Restore the data from spare
disk to DRV 1