Subject: Re: availability of SATA vendors
From: "Joshua D. Drake" <jd@commandprompt.com>
To: Jeff Frost <jeff@frostconsultingllc.com>
Cc: Bucky Jordan <bjordan@lumeta.com>,
 Luke Lonergan <llonergan@greenplum.com>,
	pgsql-performance@postgresql.org
In-Reply-To: 
 <Pine.LNX.4.64.0611220834400.4382@discord.home.frostconsultingllc.com>
References: <78ED28FACE63744386D68D8A9D1CF5D420A080@MAIL.corp.lumeta.com>
	<Pine.LNX.4.64.0611220834400.4382@discord.home.frostconsultingllc.com>
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Organization: Command Prompt, Inc.
Date: Wed, 22 Nov 2006 09:00:16 -0800
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On Wed, 2006-11-22 at 08:36 -0800, Jeff Frost wrote:
> On Wed, 22 Nov 2006, Bucky Jordan wrote:
> 
> > Dells (at least the 1950 and 2950) come with the Perc5, which is
> > basically just the LSI MegaRAID. The units I have come with a 256MB BBU,
> > I'm not sure if it's upgradeable, but it looks like a standard DIMM in
> > there...
> >
> > I posted some dd and bonnie++ benchmarks of a 6-disk setup a while back
> > on a 2950, so you might search the archive for those numbers if you're
> > interested- you should be able to get the same or better from a
> > similarly equipped LSI setup. I don't recall if I posted pgbench
> > numbers, but I can if that's of interest.
> 
> I could only find the 6 disk RAID5 numbers in the archives that were run with 
> bonnie++1.03.  Have you run the RAID10 tests since?  Did you settle on 6 disk 
> RAID5 or 2xRAID1 + 4XRAID10?

Why not 6 drive raid 10? IIRC you need 4 to start RAID 10 but only pairs
after that.

Joshua D. Drake


> 
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