Hi Robert, Before doing anything on my prod env, I generate r/w on ceph cluster using fio . On my newest cluster, release 12.2.12, I did not manage to get the (REQUEST_SLOW) warning, even if my OSD disk usage goes above 95% (fio ran from 4 diffrent hosts)
On my prod cluster, release 12.2.9, as soon as I run fio on a single host, I see a lot of REQUEST_SLOW warninr gmessages, but "iostat -xd 1" does not show me a usage more that 5-10% on disks... Le lun. 10 juin 2019 à 10:12, Robert LeBlanc <rob...@leblancnet.us> a écrit : > On Mon, Jun 10, 2019 at 1:00 AM BASSAGET Cédric < > cedric.bassaget...@gmail.com> wrote: > >> Hello Robert, >> My disks did not reach 100% on the last warning, they climb to 70-80% >> usage. But I see rrqm / wrqm counters increasing... >> >> 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 4.00 0.00 16.00 0.00 104.00 >> 13.00 0.00 0.00 0.00 0.00 0.00 0.00 >> sdb 0.00 2.00 1.00 3456.00 8.00 25996.00 >> 15.04 5.76 1.67 0.00 1.67 0.03 9.20 >> sdd 4.00 0.00 41462.00 1119.00 331272.00 7996.00 >> 15.94 19.89 0.47 0.48 0.21 0.02 66.00 >> >> dm-0 0.00 0.00 6825.00 503.00 330856.00 7996.00 >> 92.48 4.00 0.55 0.56 0.30 0.09 66.80 >> dm-1 0.00 0.00 1.00 1129.00 8.00 25996.00 >> 46.02 1.03 0.91 0.00 0.91 0.09 10.00 >> >> >> sda is my system disk (SAMSUNG MZILS480HEGR/007 GXL0), sdb and sdd are >> my OSDs >> >> would "osd op queue = wpq" help in this case ? >> Regards >> > > Your disk times look okay, just a lot more unbalanced than I would expect. > I'd give wpq a try, I use it all the time, just be sure to also include the > op_cutoff setting too or it doesn't have much effect. Let me know how it > goes. > ---------------- > Robert LeBlanc > PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 >
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