RAID

[Charles Steinkuehler]

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Charles Steinkuehler wrote:
> Luke-Jr wrote:
>>> So anyway... what's the pros/cons of the various RAID configurations possible 
>>> with 8 of 18 GB HDs? ;)
>>> Any reason to use RAID 5+0 over just RAID 5? At first glance, while 5+0 allows 
>>> loss of two disks, that only appears to be the case if both disks are in a 
>>> separate set of 4. If there's two disks failing, wouldn't that be a 50:50 
>>> chance on 5+0 being ok, or being dead? Is it worth the 18 GB to get that 
>>> 50:50 chance?
> 
> If you're thinking about RAID 5+0 (presumably dual 4-disk RAID 5 sets),
> just run one RAID5 array with 7 disks, and leave the eighth as a
> hot-spare.  You can still sort-of loose two disks (as long as they don't
> both go within a RAID rebuild time of each other...much better odds than
> your 5+0), 

> and you get an extra 18 Gig of drive space.

Umm...I must not be good at math in my head today...

Both options would loose the capacity of two disks, so there's no
capacity benefit to either approach.  The difference is only in the
fault tolerance when loosing two disks (IMHO, the 7-disk RAID5 with a
hot-spare is better than running RAID 5+0).

- --
Charles Steinkuehler
charles at steinkuehler.net
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