From: Scott Marlowe <scott.marlowe@gmail.com>
To: Mario Weilguni <mweilguni@sime.com>
Cc: Aidan Van Dyk <aidan@highrise.ca>
Cc: Joshua D. Drake <jd@commandprompt.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Experience with HP Smart Array P400 and SATA drives?
Date: Wed, 10 Dec 2008 09:17:28 -0700
Message-ID: <dcc563d10812100817v119397b8n6b8799fcecb22847@mail.gmail.com> (raw)
In-Reply-To: <493FE8B2.9040809@sime.com>
References: <4934FE60.30702@sime.com>
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<493E6023.3030800@sime.com>
<1228838308.13962.0.camel@jd-laptop.pragmaticzealot.org>
<20081209161750.GO26596@yugib.highrise.ca>
<493FB619.5060205@sime.com>
<20081210155208.GR26596@yugib.highrise.ca>
<493FE8B2.9040809@sime.com>
On Wed, Dec 10, 2008 at 9:05 AM, Mario Weilguni <mweilguni@sime.com> wrote:
> In fact, for this system we're currently going to RAID10, I'm convinced now.
> With other systems we have, RAID5 is a safe option for one reason, the
> machines are clusters, so we have (sort of) RAID50 here:
> Machine A/RAID5 <-- DRBD --> Machine B/RAID5
>
> Seems reliable enough for me. But in this case, the machine will be
> standalone, and so RAID5 might really not be the best choice.
>
> However, I'm pretty sure we'll have the same problems with RAID10, the
> problem seems to have to do with P400 and/or SATA drives.
Yeah, I'm thinking there's something off in your system and until you
resolve it you're going to have issues. I'd check the following:
firmware on RAID controller
how it runs with a couple of SAS drives in RAID-1 or RAID-0 (just for testing)
OS version / kernel version / driver version. especially compared to
your customer's machine. See how much of his environment you can
clone until performance goes up where it should be. Then change one
thing at a time until you break it again. I'm sure everyone here would
like to know what makes a P400 fast or slow.
Or, if you don't have time to mess with it, just order an escalade or
areca card and be done with it. :)
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To: pgsql-performance@postgresql.org
Cc: scott.marlowe@gmail.com, mweilguni@sime.com, aidan@highrise.ca, jd@commandprompt.com
Subject: Re: Experience with HP Smart Array P400 and SATA drives?
In-Reply-To: <dcc563d10812100817v119397b8n6b8799fcecb22847@mail.gmail.com>
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