LaCie Biggest Quadra | Understanding RAID |
User Manual | page 19 |
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3.4. RAID 5 + Hot Spare
This 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.
The 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,
This diagram represents a
ERAID 5 array, consisting of
D | four disks, which are | |
C | connected to the Controller. | |
Parity blocks are represented | ||
B | ||
by the letter P. | ||
A |
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CONTROLLER
the total capacity of the array would be 80GB [2 (3 disks – 1 disk) x 40 = 80].
A | B | PAB |
C | PCD | D |
PEF | E | F |
G | H | PGH |
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Fig. 3.4.