LaCie 4big Quadra Enterprise Class handleiding

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Handleiding

LaCie 4big Quadra Enterprise Class • Design by Neil Poulton RAID

User Manual page 17

3.1.5. RAID 5 and RAID 5+Spare

RAID 5 combines the striping of RAID 0 with data redundancy in an

array with a minimum of three disks (Fig. 12).

Data is striped across all disks and a parity block (P) for each data

block is written on the same stripe. If one physical disk fails, the data

from the failed disk can be rebuilt onto a replacement disk. No

data is lost in the case of a single disk failure, but if a second disk

fails before data can be rebuilt to a replacement drive, all data in

the array will be lost.

In RAID 5+Spare, one disk in the array is left empty. If a drive in

the array fails, the data from the failed disk is automatically rebuilt

to the empty or “spare” disk (Fig. 13).

Applications

RAID 5 combines data safety with efﬁcient use of disk space.

Disk failure does not result in a service interruption because

data is read from parity blocks. RAID 5 is useful for people

who need performance and constant access to their data,

like video editors.

In RAID 5+Spare disk failure does not require immedi-

ate attention because the system rebuilds itself using the hot

spare, but the failed disk should be replaced as soon as

possible.

RAID 5

Disk 1 Disk 2 Disk 3 Disk 4

RAID 5+Spare

Disk 1 Disk 2 Disk 3 Disk 4

Spare

Cp C2

Fig. 12

Fig. 13

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