Callahan, Tom wrote:
You "should" have a designated spare for RAID-5.
Not sure why you have 3 disks for each RAID1, RAID1 is mirror, and unless
the third drive is a spare, it is not needed.
Thanks,
Tom Callahan
Why would you have a hot spare? In RAID-1 if one drive failed you would
copy the full set of data to the "spare" so you know what to copy,
another mirror can help your read performance under heavy load. You get
the same protection as a hot spare, it's online if you need it, it
covers the case where two drives fail... what's not to like? ;-)
If a third drive is justified, I see no reason to keep it as a spare
rather than a live mirror in RAID-1.
--
bill davidsen <davidsen@xxxxxxx>
CTO TMR Associates, Inc
Doing interesting things with small computers since 1979
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