From: Mike Rylander <mrylander@gmail.com>
To: pgsql-perform <pgsql-performance@postgresql.org>
Subject: Re: Advice on RAID card
Date: Sun, 25 Sep 2005 15:27:31 +0000
Message-ID: <b918cf3d0509250827321bad1b@mail.gmail.com> (raw)
In-Reply-To: <ABE6B997-2C1E-43B1-9F18-28F54B1620FE@fastcrypt.com>
References: <IGEGINLEEDLANNHAAKCMOECJCCAA.gaulakh@ecmarket.com>
<op.sxll3du6th1vuj@localhost>
<43367937.40809@canaan.co.il>
<ABE6B997-2C1E-43B1-9F18-28F54B1620FE@fastcrypt.com>
On 9/25/05, Dave Cramer <pg@fastcrypt.com> wrote:
> I would think software raid would be quite inappropriate considering
> postgres when it is working is taking a fair amount of CPU as would
> software RAID. Does anyone know if this is really the case ?
>
I attempted to get some extra speed out of my Compaq/HP SA6404 card by
using software RAID1 across to hardware RAID10 sets. It didn't help,
but there was no noticeable load or drop in performance because of it.
Granted, this was on a 4-way Opteron, but, anecdotally speaking, the
linux software RAID has surprisingly low overhead.
My $0.02, hope it helps.
--
Mike Rylander
mrylander@gmail.com
GPLS -- PINES Development
Database Developer
http://open-ils.org
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To: pgsql-performance@postgresql.org
Cc: mrylander@gmail.com
Subject: Re: Advice on RAID card
In-Reply-To: <b918cf3d0509250827321bad1b@mail.gmail.com>
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