Hi Sylvain, Yeah, that's the best and safes way to do it. The pool I wrecked was fortunately a dummy-pool. The pool for which I want to change to EC profile is ~4PiB large, so moving all files (pool is used in CephFS) on it to a new pool might take some time and I was hoping for an in-place configuration change. But as demonstrated by my own recklessness, this does not work and will take most of the OSD down with it. Regards, Michael Am 22.06.2020 um 21:39 schrieb St-Germain, Sylvain (SSC/SPC): > The way I did is I create a new pool, copy data on it and put the new pool in place of the old one after I delete the former pool > > echo "--------------------------------------------------------------------" > echo " Create a new pool with erasure coding" > echo "--------------------------------------------------------------------" > sudo ceph osd pool create $pool.new 64 64 erasure ecprofile-5-3 > > echo "--------------------------------------------------------------------" > echo " Copy the original pool to the new pool" > echo "--------------------------------------------------------------------" > sudo rados cppool $pool $pool.new > > echo "--------------------------------------------------------------------" > echo " Rename the original pool to .old" > echo "--------------------------------------------------------------------" > sudo ceph osd pool rename $pool $pool.old > > echo "--------------------------------------------------------------------" > echo " Rename the new erasure coding pool to $pool" > echo "--------------------------------------------------------------------" > sudo ceph osd pool rename $pool.new $pool > > echo "--------------------------------------------------------------------" > echo " Set the pool: $pool to autoscaling" > echo "--------------------------------------------------------------------" > sudo ceph osd pool set $pool pg_autoscale_mode on > > echo "--------------------------------------------------------------------" > echo " Show detail off the new create pool" > echo "--------------------------------------------------------------------" > sudo ceph osd pool get $pool all > > Sylvain > > -----Message d'origine----- > De : Michael Fladischer <michael(a)fladi.at> > Envoyé : 22 juin 2020 15:23 > À : ceph-users(a)ceph.io > Objet : [ceph-users] Re: OSD crash with assertion > > Turns out, I really messed up when changing the EC profile. Removing the pool did not get rid of it's PGs on the OSDs that have crashed. > > To get my OSDs back up I used ceph-objectstore-tool like this: > > for PG in $(ceph-objectstore-tool --data-path $DIR --type=bluestore --op=list-pgs |grep '^$POOL_ID'); do > ceph-objectstore-tool --data-path $DIR --type=bluestore --op=remove --force --pgid=$PG done > > $DIR is the data path of the crashed OSD. > $POOL_ID is the ID of the pool with the messed up EC profile. > > I'm now curious if there is an easier way to do this? > > After getting rid of all PGs the OSD were able to start again. Hope this helps someone. > > Regards, > Michael > > > Am 22.06.2020 um 19:46 schrieb Michael Fladischer: >> Hi, >> >> a lot of our OSD have crashed a few hours ago because of a failed >> assertion: >> >> /build/ceph-15.2.3/src/osd/ECUtil.h: 34: FAILED >> ceph_assert(stripe_width % stripe_size == 0) >> >> Full output here: >> https://pastebin.com/D1SXzKsK >> >> All OSDs are on bluestore and run 15.2.3. >> >> I think I messed up when I tried to change an existing EC profile >> (using >> --force) for an active EC pool. >> >> I already tried to delete the pool and the EC profile and start the >> OSDs but they keep crashing with the same assertion. >> >> Is there a way to at least find out what the values are for >> stripe_width and stripe_size? >> >> Regards, >> Michael >> _______________________________________________ >> ceph-users mailing list -- ceph-users(a)ceph.io To unsubscribe send an >> email to ceph-users-leave(a)ceph.io > _______________________________________________ > ceph-users mailing list -- ceph-users(a)ceph.io To unsubscribe send an email to ceph-users-leave(a)ceph.io > _______________________________________________ > ceph-users mailing list -- ceph-users(a)ceph.io > To unsubscribe send an email to ceph-users-leave(a)ceph.io >

Hi, although changing an existing EC profile (by force) is possible (I haven't tried in Octopus yet) it won't have any effect on existing pools [1]: You can either change the crush_rule for that pool to get a different distribution (but it won't change k and m) or follow Sylvain's description to copy the pool content to a new pool with the desired EC profile. Regards, Eugen [1] https://docs.ceph.com/docs/master/rados/operations/erasure-code/#erasure-co… Zitat von Michael Fladischer <michael(a)fladi.at>at>: