Oh, didn't realize, Thanks Dietmar On 2020-03-16 09:44, Ashley Merrick wrote: > This was a bug in 14.2.7 and calculation for EC pools. > > It has been fixed in 14.2.8 > > > ---- On Mon, 16 Mar 2020 16:21:41 +0800 *Dietmar Rieder > <dietmar.rieder@xxxxxxxxxxx>* wrote ---- > > Hi, > > I was planing to activate the pg_autoscaler on a EC (6+3) pool which I > created two years ago. > Back then I calculated the total # of pgs for this pool with a target > per ods pg # of 150 (this was the recommended /osd pg number as far > as I > recall). > > I used the RedHat ceph pg per pool calculator [1] with the following > settings: > PoolyType: EC > K: 6 > M: 3 > OSD #: 220 > %Data: 100.00 > Target PGs per OSD: 150 > > This resulted into a suggested PG count of 4096, which I used to create > that pool. > (BTW: I get the same using the ceph.io pgcalc [2], setting size to 9 > (=EC 6+3)) > > # ceph osd df shows that I have now 162-169 pgs / osd > > Now I enabled the pg_autoscaler and set autoscale_mode to "warn", using > the following commands: > > # ceph mgr module enable pg_autoscaler > # ceph osd pool set hdd-ec-data-pool pg_autoscale_mode warn > > when i set the target_ratio_size to 1, using: > > # ceph osd pool set hdd-ec-data-pool target_size_ratio 1 > > I get the warning: > 1 pools have too few placement groups > > The autoscale status shows that pg number in the EC pool would get > scaled up to 16384 pgs: > > # ceph osd pool autoscale-status > POOL SIZE TARGET SIZE RATE RAW CAPACITY RATIO TARGET > RATIO BIAS PG_NUM NEW PG_NUM AUTOSCALE > ssd-rep-metadata-pool 11146M 3.0 29805G 0.0011 > 1.0 64 4 off > ssd-rep-data-pool 837.8G 3.0 29805G 0.0843 > 1.0 1024 64 off > hdd-ec-data-pool 391.3T 1.5 1614T 0.3636 > 1.0000 1.0 4096 16384 warn > > How does this relate the the calculated number of 4096 pgs for that EC > pool? I mean 16384 is quite a jump from the original value. > Is the autoscaler miscalculating something or is the pg calculator > wrong? > > Can someone explain it? (My cluster is on ceph version 14.2.7) > > > > Thanks so much > Dietmar > > [1]: https://access.redhat.com/labs/cephpgc/ > [2]: https://ceph.io/pgcalc/ > > > -- > _________________________________________ > D i e t m a r R i e d e r, Mag.Dr. > Innsbruck Medical University > Biocenter - Institute of Bioinformatics > Innrain 80, 6020 Innsbruck > Email: dietmar.rieder@xxxxxxxxxxx <mailto:dietmar.rieder@xxxxxxxxxxx> > Web: http://www.icbi.at > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx > <mailto:ceph-users@xxxxxxx> > To unsubscribe send an email to ceph-users-leave@xxxxxxx > <mailto:ceph-users-leave@xxxxxxx> > > > -- _________________________________________ D i e t m a r R i e d e r, Mag.Dr. Innsbruck Medical University Biocenter - Institute of Bioinformatics Innrain 80, 6020 Innsbruck Email: dietmar.rieder@xxxxxxxxxxx Web: http://www.icbi.at _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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