Re: Postgres on RAID5

From: Greg Stark <gsstark(at)mit(dot)edu>
To: Alex Turner <armtuk(at)gmail(dot)com>
Cc: Greg Stark <gsstark(at)mit(dot)edu>, Arshavir Grigorian <ag(at)m-cam(dot)com>, linux-raid(at)vger(dot)kernel(dot)org, pgsql-performance(at)postgresql(dot)org
Subject: Re: Postgres on RAID5
Date: 2005-03-14 20:17:11
Message-ID: 87zmx6rni0.fsf@stark.xeocode.com
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Alex Turner <armtuk(at)gmail(dot)com> writes:

> a 14 drive stripe will max out the PCI bus long before anything else,

Hopefully anyone with a 14 drive stripe is using some combination of 64 bit
PCI-X cards running at 66Mhz...

> the only reason for a stripe this size is to get a total accessible
> size up.

Well, many drives also cuts average latency. So even if you have no need for
more bandwidth you still benefit from a lower average response time by adding
more drives.

--
greg

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