From: Mark Kirkwood <markir@paradise.net.nz>
To: Luke Lonergan <llonergan@greenplum.com>
Cc: Joshua D. Drake <jd@commandprompt.com>
Cc: Craig A. James <cjames@modgraph-usa.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Reliability recommendations
Date: Sat, 25 Feb 2006 13:29:55 +1300
Message-ID: <43FFA503.5070700@paradise.net.nz> (raw)
In-Reply-To: <C024DFA1.1DC2D%llonergan@greenplum.com>
References: <C024DFA1.1DC2D%llonergan@greenplum.com>
Luke Lonergan wrote:
>
> I'd be more shocked if this weren't also true of nearly all SCSI HW RAID
> adapters of this era. If you had ordered an HP DL380 server you'd get about
> the same performance.
>
> BTW - I don't think there's anything reasonable about 50-55 MB/s from 6
> disks, I'd put the minimum for this era machine at 5 x 30 = 150MB/s.
>
He was quoting for 6 disk RAID 10 - I'm thinking 3 x 30MB/s = 90MB/s is
probably more correct? Having aid that, your point is still completely
correct - the performance @55MB/s is poor (e.g. my *ata* system with 2
disk RAID0 does reads @110MB/s).
cheers
Mark
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To: pgsql-performance@postgresql.org
Cc: markir@paradise.net.nz, llonergan@greenplum.com, jd@commandprompt.com, cjames@modgraph-usa.com
Subject: Re: Reliability recommendations
In-Reply-To: <43FFA503.5070700@paradise.net.nz>
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