Hello, On Tue, 11 Dec 2018 23:22:40 +0300 Igor Fedotov wrote: > Hi Tyler, > > I suspect you have BlueStore DB/WAL at these drives as well, don't you? > > Then perhaps you have performance issues with f[data]sync requests which > DB/WAL invoke pretty frequently. > Since he explicitly mentioned using these SSDs with filestore AND the journals on the same SSD I'd expect a similar impact aka piss-poor performance in his existing setup (the 300 other OSDs). Unless of course some bluestore is significantly more sync happy than the filestore journal and/or other bluestore particulars (reduced caching space, not caching in some situations) are rearing their ugly heads. Christian > See the following links for details: > > https://www.percona.com/blog/2018/02/08/fsync-performance-storage-devices/ > > https://www.sebastien-han.fr/blog/2014/10/10/ceph-how-to-test-if-your-ssd-is-suitable-as-a-journal-device/ > > The latter link shows pretty poor numbers for M500DC drives. > > > Thanks, > > Igor > > > On 12/11/2018 4:58 AM, Tyler Bishop wrote: > > > Older Crucial/Micron M500/M600 > > _____________________________________________ > > > > *Tyler Bishop* > > EST 2007 > > > > > > O:513-299-7108 x1000 > > M:513-646-5809 > > http://BeyondHosting.net <http://beyondhosting.net/> > > > > > > This email is intended only for the recipient(s) above and/or > > otherwise authorized personnel. The information contained herein and > > attached is confidential and the property of Beyond Hosting. Any > > unauthorized copying, forwarding, printing, and/or disclosing > > any information related to this email is prohibited. If you received > > this message in error, please contact the sender and destroy all > > copies of this email and any attachment(s). > > > > > > On Mon, Dec 10, 2018 at 8:57 PM Christian Balzer <chibi@xxxxxxx > > <mailto:chibi@xxxxxxx>> wrote: > > > > Hello, > > > > On Mon, 10 Dec 2018 20:43:40 -0500 Tyler Bishop wrote: > > > > > I don't think thats my issue here because I don't see any IO to > > justify the > > > latency. Unless the IO is minimal and its ceph issuing a bunch > > of discards > > > to the ssd and its causing it to slow down while doing that. > > > > > > > What does atop have to say? > > > > Discards/Trims are usually visible in it, this is during a fstrim of a > > RAID1 / : > > --- > > DSK | sdb | busy 81% | read 0 | write 8587 > > | MBw/s 2323.4 | avio 0.47 ms | > > DSK | sda | busy 70% | read 2 | write 8587 > > | MBw/s 2323.4 | avio 0.41 ms | > > --- > > > > The numbers tend to be a lot higher than what the actual interface is > > capable of, clearly the SSD is reporting its internal activity. > > > > In any case, it should give a good insight of what is going on > > activity > > wise. > > Also for posterity and curiosity, what kind of SSDs? > > > > Christian > > > > > Log isn't showing anything useful and I have most debugging > > disabled. > > > > > > > > > > > > On Mon, Dec 10, 2018 at 7:43 PM Mark Nelson <mnelson@xxxxxxxxxx > > <mailto:mnelson@xxxxxxxxxx>> wrote: > > > > > > > Hi Tyler, > > > > > > > > I think we had a user a while back that reported they had > > background > > > > deletion work going on after upgrading their OSDs from > > filestore to > > > > bluestore due to PGs having been moved around. Is it possible > > that your > > > > cluster is doing a bunch of work (deletion or otherwise) > > beyond the > > > > regular client load? I don't remember how to check for this > > off the top > > > > of my head, but it might be something to investigate. If > > that's what it > > > > is, we just recently added the ability to throttle background > > deletes: > > > > > > > > https://github.com/ceph/ceph/pull/24749 > > > > > > > > > > > > If the logs/admin socket don't tell you anything, you could > > also try > > > > using our wallclock profiler to see what the OSD is spending > > it's time > > > > doing: > > > > > > > > https://github.com/markhpc/gdbpmp/ > > > > > > > > > > > > ./gdbpmp -t 1000 -p`pidof ceph-osd` -o foo.gdbpmp > > > > > > > > ./gdbpmp -i foo.gdbpmp -t 1 > > > > > > > > > > > > Mark > > > > > > > > On 12/10/18 6:09 PM, Tyler Bishop wrote: > > > > > Hi, > > > > > > > > > > I have an SSD only cluster that I recently converted from > > filestore to > > > > > bluestore and performance has totally tanked. It was fairly > > decent > > > > > before, only having a little additional latency than > > expected. Now > > > > > since converting to bluestore the latency is extremely high, > > SECONDS. > > > > > I am trying to determine if it an issue with the SSD's or > > Bluestore > > > > > treating them differently than filestore... potential garbage > > > > > collection? 24+ hrs ??? > > > > > > > > > > I am now seeing constant 100% IO utilization on ALL of the > > devices and > > > > > performance is terrible! > > > > > > > > > > IOSTAT > > > > > > > > > > avg-cpu: %user %nice %system %iowait %steal %idle > > > > > 1.37 0.00 0.34 18.59 0.00 79.70 > > > > > > > > > > Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s > > > > > avgrq-sz avgqu-sz await r_await w_await svctm %util > > > > > sda 0.00 0.00 0.00 9.50 0.00 64.00 > > > > > 13.47 0.01 1.16 0.00 1.16 1.11 1.05 > > > > > sdb 0.00 96.50 4.50 46.50 34.00 11776.00 > > > > > 463.14 132.68 1174.84 782.67 1212.80 19.61 100.00 > > > > > dm-0 0.00 0.00 5.50 128.00 44.00 8162.00 > > > > > 122.94 507.84 1704.93 674.09 1749.23 7.49 100.00 > > > > > > > > > > avg-cpu: %user %nice %system %iowait %steal %idle > > > > > 0.85 0.00 0.30 23.37 0.00 75.48 > > > > > > > > > > Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s > > > > > avgrq-sz avgqu-sz await r_await w_await svctm %util > > > > > sda 0.00 0.00 0.00 3.00 0.00 17.00 > > > > > 11.33 0.01 2.17 0.00 2.17 2.17 0.65 > > > > > sdb 0.00 24.50 9.50 40.50 74.00 10000.00 > > > > > 402.96 83.44 2048.67 1086.11 2274.46 20.00 100.00 > > > > > dm-0 0.00 0.00 10.00 33.50 78.00 2120.00 > > > > > 101.06 287.63 8590.47 1530.40 10697.96 22.99 100.00 > > > > > > > > > > avg-cpu: %user %nice %system %iowait %steal %idle > > > > > 0.81 0.00 0.30 11.40 0.00 87.48 > > > > > > > > > > Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s > > > > > avgrq-sz avgqu-sz await r_await w_await svctm %util > > > > > sda 0.00 0.00 0.00 6.00 0.00 40.25 > > > > > 13.42 0.01 1.33 0.00 1.33 1.25 0.75 > > > > > sdb 0.00 314.50 15.50 72.00 122.00 17264.00 > > > > > 397.39 61.21 1013.30 740.00 1072.13 11.41 99.85 > > > > > dm-0 0.00 0.00 10.00 427.00 78.00 27728.00 > > > > > 127.26 224.12 712.01 1147.00 701.82 2.28 99.85 > > > > > > > > > > avg-cpu: %user %nice %system %iowait %steal %idle > > > > > 1.22 0.00 0.29 4.01 0.00 94.47 > > > > > > > > > > Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s > > > > > avgrq-sz avgqu-sz await r_await w_await svctm %util > > > > > sda 0.00 0.00 0.00 3.50 0.00 17.00 > > > > > 9.71 0.00 1.29 0.00 1.29 1.14 0.40 > > > > > sdb 0.00 0.00 1.00 39.50 8.00 10112.00 > > > > > 499.75 78.19 1711.83 1294.50 1722.39 24.69 100.00 > > > > > > > > > > > > > > > _______________________________________________ > > > > > ceph-users mailing list > > > > > ceph-users@xxxxxxxxxxxxxx <mailto:ceph-users@xxxxxxxxxxxxxx> > > > > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > _______________________________________________ > > > > ceph-users mailing list > > > > ceph-users@xxxxxxxxxxxxxx <mailto:ceph-users@xxxxxxxxxxxxxx> > > > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > > > > > > > -- > > Christian Balzer Network/Systems Engineer > > chibi@xxxxxxx <mailto:chibi@xxxxxxx> Rakuten Communications > > > > > > _______________________________________________ > > ceph-users mailing list > > ceph-users@xxxxxxxxxxxxxx > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com -- Christian Balzer Network/Systems Engineer chibi@xxxxxxx Rakuten Communications _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
 |