rich.fromm wrote:
But to speak out against sweeping generalizations, I wouldn't necessarily agree that RAID 5 is always a good idea.
Both of your "if I recalls" agree with my present-day experience. Writing is a bit slower, and it's not possible to add a disk and enlarge an array (on our controller or others I've known).
For mapping purposes, I don't know that either of these are particularly major, though. Writing happens a few times, reading happens a zillion times, so the tradeoff is quite worthwhile.
And enlarging the array isn't an issue of RAID-5, but of system planning in general: number of drive bays, power capacity, etc.
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