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SubjectRe: RAID extremely slow
On Fri, 27 Jul 2012 14:45:18 -0700, you wrote:

>On 07/27/2012 12:08 PM, Bill Davidsen wrote:
>> Have you set the io scheduler to deadline on all members of the array?
>> That's kind of "job one" on older kernels.
>I have not, thanks for the tip, I'll look into that now.

Plus I disable the on-drive queuing (NCQ) during startup, right now
I don't have benchmarks to show the difference. This on a six by 1TB
drive RAID6 array I built over a year ago on Slackware64-13.37:

# cat /etc/rc.d/rc.local
# turn off NCQ on the RAID drives by adjusting queue depth to 1
echo "rc.local: Disable RAID drives' NCQ"
for d in a b c d e f
echo " set NCQ depth to $n on sd${d}"
echo $n > /sys/block/sd${d}/device/queue_depth

Maybe you could try that? See if it makes a difference. My drives
are Seagate.


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