Wednesday, 25 May 2011

RAID6 progress revisited

The automatic RAID6 recovery algorithm currently in the works will most likely require at least N-1 disks for successful recovery. This is because the Reed-Solomon calculation depends on the order of disks, from which the chicken-and-egg problem results. If two disks are missing, the chicken-and-egg problem seemengly cannot be resolved automatically.

Even as it is with the N-1 requirement, the algorithm looks quite heavy CPU-wise. Looks like the RAID6 recovery implementation would be CPU-bound unlike all other RAID types, which are I/O-bound.

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