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

From: "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>
To: Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>
Cc: Gabriele Turchi <gabriele(dot)turchi(at)l39a(dot)com>, Mario Weilguni <mweilguni(at)sime(dot)com>, Alan Hodgson <ahodgson(at)simkin(dot)ca>, pgsql-performance(at)postgresql(dot)org
Subject: Re: Experience with HP Smart Array P400 and SATA drives?
Date: 2008-12-09 16:43:46
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
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

   Consulting, Development, Support, Training
   503-667-4564 -
   The PostgreSQL Company, serving since 1997

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