linux-kernel - Re: 3ware disk latency?

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Message-ID: <Pine.LNX.4.64.0607261809350.6441@p34.internal.lan>
Date:	Wed, 26 Jul 2006 18:10:02 -0400 (EDT)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	adam radford <aradford@...il.com>
cc:	dean gaudet <dean@...tic.org>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Jan Kasprzak <kas@...muni.cz>, linux-kernel@...r.kernel.org
Subject: Re: 3ware disk latency?


On Wed, 26 Jul 2006, adam radford wrote:

> On 7/26/06, dean gaudet <dean@...tic.org> wrote:
>> 
>> unfortunately when i did the experiment i neglected to perform
>> simultaneous tests on more than one 3ware unit on the same controller.  i
>> got great results from a raid1 or from a raid10 (even a raid5)... but
>> never i only tested one unit at a time.
>> 
>
> Did you try setting /sys/class/scsi_host/hostX/cmd_per_lun to 256 / num_units 
> ?
>
> -Adam
> -
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Speaking of this does anyone having any tuning guides for running 10 disk 
raid 5's on this controller? And as far as ext3 goes, what are the best 
optimizations?

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