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Re: [K12OSN] backend raid 1, raid 5 or none of the above?



On Wed, 8 Aug 2007 08:34:43 +1200, Krsnendu dasa wrote
> >
> >
> > If you need something *very* reliable, then RAID 50 would be your bet.
> > If you need balls-out speed and good reliability, RAID 10 is your bet.
> >
> > --TP
> >
> How is RAID 50 more reliable than RAID? Doesn't the 0 part add speed not
> reliablility?

Here is a description of RAID 50 and RAID 05.

http://www.pcguide.com/ref/hdd/perf/raid/levels/multLevel05-c.html

This should clear up the benefits of either.

Short version, RAID 50 is a RAID 0 stripe of RAID 5 arrays. RAID 05 is a RAID 5 array
made from RAID 0 stripes.  In RAID 50 since you have a stripe of multiple RAID 5's you
get more fault tolerance (can loose a drive from both arrays and still function), and
the striping should provide improved speeds.

HTH
Jim

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