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2.1
Hot Spare Feature
Spare disks can be installed in the disk array unit. If a disk drive is defected, the data in the defective
disk drive is recovered in the spare disk. After the data recovery, the disk drive operates normally if
another disk drive is defected.
A defective disk drive can be replaced without turning off the power of the disk array unit.
With the shipping default, if the disk drive defected during the operation by using the spare disk is
replaced with a normal disk drive, the replaced disk drive works as a spare disk.
The data can also be recovered in another other disk enclosure.
Example of hot spare operation (LDN0 RAID5)
PDN14
Spare disk
PDN13
PDN12
PDN11
PDN10
PDN9
PDN8
PDN7
PDN6
PDN5
PDN4
PDN3
LDN0 RAID5
PDN2
PDN1
PDN0
Failure in PDN1
*
PDN: Physical Disk Number
LDN: Logical Disk Number
Do not move any of the factory-installed disk drives into another slot.
The spare disk can operate only when it has a capacity and a revolution
equal to the defected disk drive.
If disk drives having different capacities and/or revolutions coexist, spare
disks of the different capacities and/or revolutions are defined to manage the
disk drives clearly.
Up to 32 spare disks may be installed in the entire disk array unit.
PDN14
PDN13
PDN12
PDN11
PDN10
PDN9
⇒
PDN8
PDN7
PDN6
PDN5
PDN4
PDN3
PDN2
PDN1
PDN0
Recovery of data
in spare disk
PDN14
PDN13
PDN12
PDN11
PDN10
PDN9
⇒
PDN8
PDN7
PDN6
PDN5
PDN4
PDN3
LDN0 RAID5
PDN2
PDN1
PDN0
Replacement of PDN 1
PDN1 works as a spare disk
2-2
LDN0 RAID5
Spare Disk
⇐
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