[cvsnt] performence problem
jpeacock at rowman.com
Tue Feb 22 14:24:42 GMT 2005
Peter Crowther wrote:
> - RAID '10' (duplexed RAID 5) for repository - or, if performance is your *absolute* requirement, duplexed RAID 0 and watch like a hawk for disk failures!
> For extra points, make the mirrors duplexed, i.e. on different controllers.
Just to pick nits here, RAID 10 (often referred to as 1+0) has nothing
whatsoever to do with RAID 5. RAID 5 includes distributed parity on
each drive and a single drive failure is easy to recover from. RAID 1+0
is a mirrored (for maximum reliability) set of striped drives (for
maximum performance), where multiple drive failures are recoverable
(under certain circumstances). Here's a good link with nice graphics:
RAID 1+0 works very well with dual controllers so that the mirrored
writes can be absolutely parallel. Don't confuse RAID 1+0 with 0+1
which is _not_ the same thing; I think your reference to "duplexed RAID
0" is what most people refer to as 0+1.
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