Re: Experience with HP Smart Array P400 and SATA drives?

On Tue, 2008-12-09 at 09:25 -0700, Scott Marlowe wrote:
> On Tue, Dec 9, 2008 at 9:03 AM, Gabriele Turchi
> <gabriele(dot)turchi(at)l39a(dot)com> wrote:
> > We reached a fairly good performance on a P400 controller (8 SATA 146GB 2,5"
> > 10k rpm) with raid5 or raid6 Linux software raid: the writing bandwidth
> > reached about 140 MB/s sustained throughput (the hardware raid5 gave a
> > sustained 20 MB/s...). With a second, equal controller (16 disks) we reached
> > (raid6 spanning all 16 disks) about 200 MB/s sustained.
>
> That's better than you were getting but still quite slow. I was
> bothered that my 12x15k4 SAS RAID-10 array could only sustain about
> 350Megs/second sequential read, thinking that each drive should be
> able to approach 80 or so megs/second and I was only getting about
> 60...
>
> This sounds more and more like HP is trying to undercompete along with
> Dell in the RAID controller market or at least the raid controller
> driver market.

It is certainly possible. The 400 is the higher end of the lower end
with HP... 200, 400, 600, 800 (800 is a nice controller).

Joshua D. Drake

>
--
PostgreSQL
Consulting, Development, Support, Training
503-667-4564 - http://www.commandprompt.com/
The PostgreSQL Company, serving since 1997