Hi All,
On Thu, Jun 15, 2000 at 07:46:03PM +0100, Paul Jakma wrote:
> > You have an extra column's worth of data to write - the parity info.
> for which you have an extra disk. so forget that argument.
> > That's 50% more data for a 3-column RAID5 than for a mirror.
> no, the 3disk RAID5 has double the read throughput of a 2 disk RAID1.
Yeah, I'll go along with this. A good (*) raid5 card with plenty of
writeback battery-backed cache (**) is better (***) than anything else.
Benchmark, benchmark, benchmark! :-)
Wesley.
(*) One that doesn't bother doing any reads when it's writing to a
whole stripe...
(**) ...and that has enough cache to minimise the effects of /having/
to write smaller fragments.
(***) Except perhaps in degraded and rebuild modes. And for certain
highly specialised applications, like ... um ... sorry, I can't
think of any. :-(
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