Sašo Kiselkov wrote:
On 02/18/2013 05:18 AM, Grant Albitz wrote:
I would like to discuss one more item:
Based on the writes below vs the reads it seems like I am able to get more data
out of a w/s as apposed to a read per second. I may just be misunderstanding
the results but the disks themselves are rated for higher read performance then
write. I am just wondering if there is a zfs tunable I can play with. The disks
seem have much more queued up during writes then reads as well.
time dd if=/dev/zero of=/PSC.Net/dd.tst bs=2048000 count=131027
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t24d0
0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c2t0d0
0.0 1057.2 0.0 89869.6 0.0 9.6 0.0 9.1 1 67 c1t0d0
0.0 1057.2 0.0 89852.5 0.0 9.6 0.0 9.1 1 67 c1t1d0
0.0 1057.4 0.0 89946.6 0.0 9.6 0.0 9.1 1 66 c1t2d0
0.0 1057.0 0.0 89912.4 0.0 9.6 0.0 9.1 1 67 c1t3d0
0.0 1038.0 0.0 87068.1 0.0 9.5 0.0 9.1 1 66 c1t4d0
0.0 1037.2 0.0 87015.8 0.0 9.5 0.0 9.1 1 66 c1t5d0
0.0 1037.0 0.0 87076.6 0.0 9.5 0.0 9.2 1 66 c1t6d0
time dd if=/PSC.Net/dd.tst of=/dev/null bs=2048000
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t24d0
0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c2t0d0
884.1 0.0 38373.3 0.0 0.0 0.3 0.0 0.4 1 13 c1t0d0
873.7 0.0 38425.6 0.0 0.0 0.3 0.0 0.4 1 14 c1t1d0
883.5 0.0 38399.9 0.0 0.0 0.3 0.0 0.4 1 13 c1t2d0
875.1 0.0 38408.2 0.0 0.0 0.3 0.0 0.4 1 13 c1t3d0
876.5 0.0 38528.1 0.0 0.0 0.3 0.0 0.4 1 13 c1t4d0
880.7 0.0 38520.2 0.0 0.0 0.3 0.0 0.4 1 14 c1t5d0
874.9 0.0 38510.4 0.0 0.0 0.3 0.0 0.4 1 13 c1t6d0
That PERC H710 is probably really messing with your results here. First
of all, the transparent compression of SSDs seems to be helping you out
in the first instance. You'll need to circumvent that sucker (e.g. by
writing compressed files).
Next, I suggest you get rid of that H710 if possible, stick the H310 in
and configure it in JBOD mode - we can try to resolve the driver issues,
there's been some work in Illumos on this lately, so you might be able
to build some custom driver modules (or I can do it for you).
I agree with Sas's comments on the 710.
If you have driver problems with a 310, try Solaris 11 as an experiment
to verify performance, I have a number of Dells with 310 in JBOD mode
running Solaris and they work well.
--
Ian.
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