From: Joshua D. Drake <jd@commandprompt.com>
To: Thomas F. O'Connell <tfo@sitening.com>
Cc: Kenji Morishige <kenjim@juniper.net>
Cc: pgsql-performance@postgresql.org
Subject: Re: most bang for buck with ~ $20,000
Date: Tue, 08 Aug 2006 15:28:14 -0700
Message-ID: <44D90FFE.7010807@commandprompt.com> (raw)
In-Reply-To: <9EE66C7F-0B04-4472-9EBD-CD567AC9EA1D@sitening.com>
References: <20060808204354.GN29379@juniper.net>
<44D906E1.7010405@commandprompt.com>
<9EE66C7F-0B04-4472-9EBD-CD567AC9EA1D@sitening.com>
Thomas F. O'Connell wrote:
>
> On Aug 8, 2006, at 4:49 PM, Joshua D. Drake wrote:
>
>>> I am considering a setup such as this:
>>> - At least dual cpu (possibly with 2 cores each)
>>> - 4GB of RAM
>>> - 2 disk RAID 1 array for root disk
>>> - 4 disk RAID 1+0 array for PGDATA
>>> - 2 disk RAID 1 array for pg_xlog
>>> Does anyone know a vendor that might be able provide such setup?
>
> Wouldn't it be preferable to put WAL on a multi-disk RAID 10 if you had
> the opportunity? This gives you the redundancy of RAID 1 but approaches
> the performance of RAID 0, especially as you add disks to the array. In
> benchmarking, I've seen consistent success with this approach.
WALL is written in order so RAID 1 is usually fine. We also don't need
journaling for WAL so the speed is even faster.
Joshua D. Drake
>
> --
> Thomas F. O'Connell
> Sitening, LLC
>
> http://www.sitening.com/
> 3004B Poston Avenue
> Nashville, TN 37203-1314
> 615-469-5150 x802
> 615-469-5151 (fax)
>
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To: pgsql-performance@postgresql.org
Cc: jd@commandprompt.com, tfo@sitening.com, kenjim@juniper.net
Subject: Re: most bang for buck with ~ $20,000
In-Reply-To: <44D90FFE.7010807@commandprompt.com>
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