[rescue] does this guy know his stuff?

[vance at neurotica.com]

On Sun, 27 Jul 2003, Mike Meredith wrote:

> > On Sun, 27 Jul 2003, Mike Meredith wrote: I prefer RAID 5, rather than
> > 0+1, becuase it's more space-efficient.
>
> Oh I do too ... even on database servers (at least whilst the bottleneck
> is application inefficiency), but even with hardware RAID you get around
> a 25% performance hit for RAID5(benchmarked on an untuned system with a
> T3). I'd expect software RAID5 to be somewhat worse, although I haven't
> benchmarked it.

If I am that concerned about performance, I'll do a RAID 0 with batched
lazy writes to backup constantly.  It is effectively the same as 0+1, but
I don't need fast drives for the mirrors.

Peace...  Sridhar