comments are inline. On 05/02/2016 09:42 PM, Dan Lambright wrote: > > ----- Original Message ----- >> From: "Sergei Hanus" <getallad@xxxxxxxxx> >> To: "Mohammed Rafi K C" <rkavunga@xxxxxxxxxx> >> Cc: "Dan Lambright" <dlambrig@xxxxxxxxxx> >> Sent: Monday, May 2, 2016 9:40:22 AM >> Subject: Re: SSD tier experimenting >> >> Mohammed, thank you once more for getting involved. >> Workload is artificial - I use IOmeter to generate iops. I use 512b, 50% >> random, 75% read profile. >> I have created 100G gluster volume, created vm (using libvirt) and attached >> volume as a separate disk to VM. >> Dataset for testing is 10GB (vm ram size is 4GB). >> >> As I described, when I run test without tiering - I get around 3k iops. >> When I attach tier and restart test with same parameters - I get latency >> about seconds and 50-60 iops for pretty long time (5 mins, didn't run test >> longer. Maybe, should I?). So in case of tiering create workload, there is a performance drop. We are planning to make a volume set command to that can be set if the workload is small file performance oriented. I would be interested to see the numbers on a plane tier volume. What I mean is, create a plane volume, attach a tier, then only start i/o and see the performance numbers. >> >> Requested log file is attached. This is a regression caused in the latest 3.7 branch release. You can track the status here [1]. The fix will be available in next 3.7 release. Though it shows the status as failed, functionally there is no problem, as it just show the status as failed. >> >> As I described, I will be glad to work further on gluster in case you need >> more experimenting. >> > The small file issue Rafi mentioned can be tracked with this patch > > http://review.gluster.org/#/c/13601/ > > This patch will make it downstream, but that will take longer. > > Your drop in performance is worse than anything I've seen, though.. I'm not sure the patch could explain your behavior. > > If you create a new volume made up only of the same bricks /ssd/brick{1..3} in the hot tier and run the same workload, what iops do you see? > _______________________________________________ Gluster-users mailing list Gluster-users@xxxxxxxxxxx http://www.gluster.org/mailman/listinfo/gluster-users
