IBM System Storage Ideas Portal


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Status Not under consideration
Workspace IBM DS8000
Created by Guest
Created on Jul 11, 2017

RELATED IDEAS

Dynamic RAID / Declustered RAID for Next DS8880

Distributed RAID or Declustered RAID or Dynamic RAID is especially popular with RAID-6 (what is now a default), and larger drive capacities.
With larger drive capacities, the rebuild times in general grow a lot. Now this Distributed RAID not only distributes the parity blocks across all drives within the RAID, but also there is no own Hot Spare anymore, as the Hot Spare(s) too become part of the overall drive backend and also will get distributed.
So this can sharply improve RAID rebuild times, as well as it increases performance also.

Midrange products like Storwize V7000 support this (cf. Spectrum Virtualize code since V7.6), or even some entry products like DS3000. Also XIV has a much shorter rebuild time -- even more so, the DS8000 should get that.
A RAID rebuild can be done in 2 passes, of which the duration for the first pass (e.g. to reestablish redundancy in the case of an assumed RAID-5) can be brought down to a fraction.

Several customers so far asking.

Idea priority Medium

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