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LaCie Biggest Quadra
User Manual
page 19
Understanding RAID
3.4. RAID 5 + Hot Spare
is level is the same as RAID 5, but one disk is des-
ignated as a “Hot Spare,” which means that in the event of
a disk failure, the “Hot Spare” disk would automatically be
activated to replace the failed disk.
e storage capacity of a RAID 5+ Hot Spare array fol-
lows the same logic as that of RAID 5, but with the dif-
ference being that there is one less disk in the array. So, for
instance, if there was a RAID 5+ Hot Spare array with three
drives of varying capacities of 40GB, 50GB and 60GB, and
one disk designated as the hot spare with a capacity of 70GB,
the total capacity of the array would be 80GB [2 (3 disks – 1
disk) x 40 = 80].
This diagram represents a
RAID 5 array, consisting of
four disks, which are
connected to the Controller.
Parity blocks are represented
by the letter P.
E
D
C
B
A
CONTROLLER
A
C
PEF
G
B
H
PCD
E
F
PAB
PGH
D
Fig. 3.4.