Date: Thu, 07 Aug 2008 21:40:00 +1200
From: Mark Kirkwood <markir@paradise.net.nz>
Subject: Re: file system and raid performance
In-reply-to: <489A3B75.6060004@paradise.net.nz>
To: greg@tcscs.com
Cc: 'Mark Wong' <markwkm@gmail.com>, david@lang.hm,
	pgsql-performance@postgresql.org, 'Gabrielle Roth' <gorthx@gmail.com>
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Mark Kirkwood wrote:
> You are right, it does (I may be recalling performance from my other 
> machine that has a 3Ware card - this was a couple of years ago...) 
> Anyway, I'm thinking for the Hardware raid tests they may need to be 
> specified.
>
>

FWIW - of course this somewhat academic given that the single disk xfs 
test failed! I'm puzzled - having a Gentoo system of similar 
configuration (2.6.25-gentoo-r6) and running the fio tests a little 
modified for my config (2 cpu PIII 2G RAM with 4x ATA disks RAID0 and 
all xfs filesystems - I changed sizes of files to 4G and no. processes 
to 4) all tests that failed on Marks HP work on my Supermicro P2TDER + 
Promise TX4000. In fact the performance is pretty reasonable on the old 
girl as well (seq read is 142Mb/s and the random read/write is 12.7/12.0 
Mb/s).

I certainly would like to see some more info on why the xfs tests were 
failing - as on most systems I've encountered xfs is a great performer.

regards

Mark