Chris.Ellis@xxxxxxxxxxxxxxxxx wrote:
Stefan Kaltenbrunner <stefan@xxxxxxxxxxxxxxxx> wrote on 01/04/2009 06:53:07:
> Chris.Ellis@xxxxxxxxxxxxxxxxx wrote:
> >
> > Scott Marlowe <scott.marlowe@xxxxxxxxx> wrote on 31/03/2009 15:53:34:
> >
> > > On Tue, Mar 31, 2009 at 8:21 AM,
<Chris.Ellis@xxxxxxxxxxxxxxxxx> wrote:
> > > >
> > > > Scott Marlowe <scott.marlowe@xxxxxxxxx> wrote on 31/03/2009
15:16:01:
> > > >
> > > >> I'd call IBM and ask them to come pick up their boat anchors.
> > > >
> > > > My sentiments exactly, unfortunately, I seem stuck with them :(
> > >
> > > Can you at least source your own RAID controllers?
> >
> > Yes I will be, I never really did trust IBM and I certainly don't now!
> >
> > I just need to choose the correct RAID card now, good performance
at the
> > right price.
>
> you are jumping to conclusions too quickly - while the 8k is not the
> worlds fastest raid card available it is really not (that) bad at all.
> we have plenty of x3650 in production and last time I tested I was
> easily able to get >>2000tps even on an untuned postgresql install and
> with fwer disks.
Could you provide any more information upon your configurations if
possible, please?
x3650, dual quadcore Xeon 5430. Servraid 8k with 256MB-BBWC and likely
RAID6 during that testing. OS was/is debian etch/amd64. Don't have the
exact (pgbench) test parameters handy anymore though...
>
> So I really think you are looking at another problem here (be it
> defective hardware or a driver/OS level issue).
Hardware is always a possiblity, finally managed to get hold of IBM too.
I have tried two different Linux distro's, with different kernels, My
current Mandriva test using a fairly upto date kernel.
I may try a custom kernel.
also test with different IO schedulers(especially deadline and noop).
Stefan
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