On Oct 1, 2006, at 11:24 PM, Anton B. Rang wrote:
I was perhaps slightly hasty; RAID-5 is more efficient than a 2-
disk mirror for reads, but RAID-10 (striping & mirroring) can match
(or slightly exceed) its efficiency for small reads. In both cases,
there is a single disk accessed.
With 4 disks, RAID-1+0 can service four independent reads
concurrently, while RAID-5 can service up to four independent reads
concurrently, but perhaps as few as 1 if all reads are directed to
the same spindle. Under heavy loads, all spindles will generally be
busy, so performance is similar.
Let me see if I understand. If I have a RAID10 with 4 or more disk,
then for a mailstore this would be the optimal solution. I expect to
have 6 or more disk in mirrors, so would that increase it's efficiency?
keith
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