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@xxxxxxxxxxx> 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.
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