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ARCTICROC 4T – 4Bay RAID System - User Manual Page | 24

RAID 5 + HotSpare

In the RAID 5 + HotSpare Mode, also called HotStand, the last disk in the system is left empty as

backup. When any of the disks in the system fails, the back up disk will automatically be rebuilt

to replace the failed disk. RAID 5+HotSpare Mode provides more than decent data protection

and fault tolerance. The speed of operation is slow in comparison to other RAID modes.

Under RAID 5+HotSpare Mode, 4 HDDs in an array are required. The storage capacity

will become 3 minus 1, totaling only 2 HDD storing data and is limited to the smallest

size of the HDDs, plus 1 more HDD as the backup disk.

RAID 5+HotSpare

Disk 1 Disk 2 Disk 3 Disk 4

A1 A2

B1 Bp

Cp C1

D2 Dp

Spare

If one of the disks fails, the source data can be reconstructed through parity calculation

without replacing it with a new disk. In the 4-Bay RAID System, the "Disk 4" is located

in the "HDD 1" slot position.

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