From: Merlin Moncure <mmoncure@gmail.com>
To: Michael Ben-Nes <miki@epoch.co.il>
Cc: PostgreSQL Performance <pgsql-performance@postgresql.org>
Subject: Re: Integrated perc 5/i
Date: Thu, 16 Aug 2007 08:59:51 -0400
Message-ID: <b42b73150708160559h18502bb9ved421ec4b7be7c1a@mail.gmail.com> (raw)
In-Reply-To: <f3be18fa0708160126i62a857d6ubd993546bc3c197b@mail.gmail.com>
References: <f3be18fa0708160126i62a857d6ubd993546bc3c197b@mail.gmail.com>
On 8/16/07, Michael Ben-Nes <miki@epoch.co.il> wrote:
> Hi
>
> I wanted to know if the integrated perc 5/i which come with Dell 2950 will
> yield maximum performance from RAID 10 ( 15K SAS ).
> Or should I ask for different card ?
>
> I read an old post that shows that RAID 10 does not work eficently under
> perc 5/i
> http://groups.google.com/group/pgsql.performance/browse_thread/thread/b85926fe6de1f6c2/38837995887b6...
>
> Does any one have any experience with RAID 10 & perc 5/i ?
no, I've tested raid 10 on a few different perc 5/i and never had
those results. raid 10 often gives poor sequential read performance
relative to a raid 5 but better random performance generally, which is
usually more important. That said, the perc 5/e (never done raid 5 on
the 5/i) has posted some of the best raid 5 numbers I've ever seen in
terms of random performance on sata.
merlin
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To: pgsql-performance@postgresql.org
Cc: mmoncure@gmail.com, miki@epoch.co.il
Subject: Re: Integrated perc 5/i
In-Reply-To: <b42b73150708160559h18502bb9ved421ec4b7be7c1a@mail.gmail.com>
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