Re: Raid 5 vs Raid 10 Benchmarks Using bonnie++

On Wed, Aug 17, 2011 at 01:32:41PM -0500, Ogden wrote:
>
> On Aug 17, 2011, at 1:31 PM, ktm(at)rice(dot)edu wrote:
>
> > On Wed, Aug 17, 2011 at 01:26:56PM -0500, Ogden wrote:
> >> I am using bonnie++ to benchmark our current Postgres system (on RAID 5) with the new one we have, which I have configured with RAID 10. The drives are the same (SAS 15K). I tried the new system with ext3 and then XFS but the results seem really outrageous as compared to the current system, or am I reading things wrong?
> >>
> >> The benchmark results are here:
> >>
> >> http://malekkoheavyindustry.com/benchmark.html
> >>
> >>
> >> Thank you
> >>
> >> Ogden
> >
> > That looks pretty normal to me.
> >
> > Ken
>
> But such a jump from the current db01 system to this? Over 20 times difference from the current system to the new one with XFS. Is that much of a jump normal?
>
> Ogden

Yes, RAID5 is bad for in many ways. XFS is much better than EXT3. You would get similar
results with EXT4 as well, I suspect, although you did not test that.

Regards,
Ken