Re: 3ware disk latency?

[Justin Piszcz <jpiszcz@lucidpixels.com>]

On Wed, 26 Jul 2006, adam radford wrote:

> On 7/26/06, dean gaudet <dean@arctic.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
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/

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?

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/