Message-ID: <48C97740.9040404@emolecules.com>
Date: Thu, 11 Sep 2008 12:53:36 -0700
From: Craig James <craig_james@emolecules.com>
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To: Laszlo Nagy <gandalf@shopzeus.com>
CC: pgsql-performance@postgresql.org
Subject: Re: Choosing a filesystem
References: <48C94770.2090505@shopzeus.com>
	<alpine.DEB.1.10.0809111814130.4454@aragorn.flymine.org>
	<20080911172332.GP6714@it.is.rice.edu>
	<48C90F58.EE98.0025.0@wicourts.gov> <48C959BD.80307@shopzeus.com>
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Laszlo Nagy wrote:
> I cannot spend more money on this computer, but since you are all 
> talking about battery back up, I'll try to get money from the management 
> and buy this:
> 
> Intel® RAID Smart Battery AXXRSBBU3, optional battery back up for use 
> with AXXRAK18E and SRCSAS144E.  RoHS Complaint.

The battery-backup is really important.  You'd be better off to drop down to 8 disks in a RAID 1+0 and put everything on it, if that meant you could use the savings to get the battery-backed RAID controller.  The performance improvement of a BB cache is amazing.

Based on advice from this group, configured our systems with a single 8-disk RAID 1+0 with a battery-backed cache.  It holds the OS, WAL and database, and it is VERY fast.  We're very happy with it.

Craig