Re: Spurious HD convictions

["Majed B." <majedb@gmail.com>]

As far as I know, the numbers in between define the queue depth of
commands sent to the disks.

It's a matter of whether you want the disk(s) firmware to manage
sorting & executing the commands (when the queue is > 1) or not. In
all cases, as far as I know, the kernel does the sorting before
sending the commands to the disk(s). So if you notice better
performance (when the array is stable) with the queue=1, then keep it
that way.

On Tue, Dec 15, 2009 at 8:06 AM, Leslie Rhorer <lrhorer@satx.rr.com> wrote:
>> Hi Leslie,
>>
>> I was wondering if you were able to stop the weird behavior with your
>> disks.
>
>        It seems to have done so, yes.  I've looked around the web trying to
> find some additional info, but I've come up empty handed.  Perhaps someone
> here can answer at least one of my questions?  I know that putting a value
> of 32 into /sys/block/<driveID>/device/queue_depth fully enables NCQ, and
> putting a value of 1 there disables NCQ.  What do all the numbers in between
> do?
>
>



-- 
       Majed B.
--
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html