Quoting <20000615200527.A4294 at tux.blackstar.co.uk>
by Wesley Darlington <wesley at blackstar.co.uk>:
> > > 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! :-)
You can have something that's relatively (fast, safe, cheap), pick any
two. RAID5 is relatively safe and cheap. It's not relatively fast.
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