Re: 3ware disk latency?

From: Jeff V. Merkey
Date: Wed Jul 26 2006 - 18:11:42 EST


adam radford wrote:

On 7/26/06, dean gaudet <dean@xxxxxxxxxx> 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@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

Adam,

Isn't it set to this by default or is the default 128?

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