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  3. August 2008

Re: Performance Impact of going from 2 parity drives to 4 paritydrives in a 4-disk RAID set

On Thu, Aug 21, 2008 at 11:05 PM, Charles Wilt <charles.wilt@xxxxxxxxx> wrote:
You are saying there's a performance improvement going from a 4-disk
RAID 5 that only uses 2 parity drives to a 4-disk RAID 5 that uses all
4 drives for parity.

That's what I expected, but IBM is telling us otherwise.

Well, there, writes will be more balanced. Currently, parity writing
is forced on 2 disks, so your write speed will suffer.

However, the amount by which the performance will increase might or
might not be large, depending on what you're doing.


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