David Thornton wrote:
>
> raid5 > raid 0=1 ?

Old rule of thumb was only poor uses RAID5. Software RAID 5 does nothing
but suck, though good hardware RAID controller with at least 32MB NVRAM
is often faster with raid5 than RAID 0+1. Depends heavily on type of
disk access.

> Mirror the stripes better than striping the mirrors ?

Well, striped mirrors is better in terms of reliability. For example,
think three 2-way mirrors striped. If one disk fails, there is still 2
mirrored members on stripe set. Should another disk fail, there is
probabilty of 4/5 = 80% disk systems survives. OTOH, in case of mirrored
stripes, there is probability of only 3/5 = 60% disk system survives
another disk failure.

> bsd better than linux ?

Matter of taste mostly. One could argue that bsd has a longer history,
so it's more mature system for server usage. YMMV.

-- 
  Eino Tuominen
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