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Complex RAID 5 Variations


RAID 50. This array has got significant differences from a typical RAID 5. The write speed increases as compared to a simple RAID 5. The array can survive a single disk failure. RAID 50 is used to decrease a probability of two disks failing simultaneously in one RAID 5 set.

RAID 50

RAID 5 with a hot spare disk, RAID 5E and RAID 5EE. These arrays have additional unused capacity which equals to the size of one member disk. It allows to start rebuilding the array immediately in case of a disk failure. For a RAID 5 with hot spare, additional disk sits idle; in RAID 5E and RAID 5EE the spare capacity is distributed between all the array member disks to improve performance. Diagrams of such arrays are shown below:

RAID 5 + Hot Spare RAID 5E RAID 5EE
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