There have been bugs here in the recent past which have been fixed for hammer, at least...it's possible we didn't backport it for the giant point release. :(
But for users going forward that procedure should be good! -Greg On Thu, Mar 26, 2015 at 11:26 AM, Kyle Hutson <kylehut...@ksu.edu> wrote: > For what it's worth, I don't think "being patient" was the answer. I was > having the same problem a couple of weeks ago, and I waited from before 5pm > one day until after 8am the next, and still got the same errors. I ended up > adding a "new" cephfs pool with a newly-created small pool, but was never > able to actually remove cephfs altogether. > > On Thu, Mar 26, 2015 at 12:45 PM, Jake Grimmett <j...@mrc-lmb.cam.ac.uk> > wrote: >> >> On 03/25/2015 05:44 PM, Gregory Farnum wrote: >>> >>> On Wed, Mar 25, 2015 at 10:36 AM, Jake Grimmett <j...@mrc-lmb.cam.ac.uk> >>> wrote: >>>> >>>> Dear All, >>>> >>>> Please forgive this post if it's naive, I'm trying to familiarise myself >>>> with cephfs! >>>> >>>> I'm using Scientific Linux 6.6. with Ceph 0.87.1 >>>> >>>> My first steps with cephfs using a replicated pool worked OK. >>>> >>>> Now trying now to test cephfs via a replicated caching tier on top of an >>>> erasure pool. I've created an erasure pool, cannot put it under the >>>> existing >>>> replicated pool. >>>> >>>> My thoughts were to delete the existing cephfs, and start again, however >>>> I >>>> cannot delete the existing cephfs: >>>> >>>> errors are as follows: >>>> >>>> [root@ceph1 ~]# ceph fs rm cephfs2 >>>> Error EINVAL: all MDS daemons must be inactive before removing >>>> filesystem >>>> >>>> I've tried killing the ceph-mds process, but this does not prevent the >>>> above >>>> error. >>>> >>>> I've also tried this, which also errors: >>>> >>>> [root@ceph1 ~]# ceph mds stop 0 >>>> Error EBUSY: must decrease max_mds or else MDS will immediately >>>> reactivate >>> >>> >>> Right, so did you run "ceph mds set_max_mds 0" and then repeating the >>> stop command? :) >>> >>>> >>>> This also fail... >>>> >>>> [root@ceph1 ~]# ceph-deploy mds destroy >>>> [ceph_deploy.conf][DEBUG ] found configuration file at: >>>> /root/.cephdeploy.conf >>>> [ceph_deploy.cli][INFO ] Invoked (1.5.21): /usr/bin/ceph-deploy mds >>>> destroy >>>> [ceph_deploy.mds][ERROR ] subcommand destroy not implemented >>>> >>>> Am I doing the right thing in trying to wipe the original cephfs config >>>> before attempting to use an erasure cold tier? Or can I just redefine >>>> the >>>> cephfs? >>> >>> >>> Yeah, unfortunately you need to recreate it if you want to try and use >>> an EC pool with cache tiering, because CephFS knows what pools it >>> expects data to belong to. Things are unlikely to behave correctly if >>> you try and stick an EC pool under an existing one. :( >>> >>> Sounds like this is all just testing, which is good because the >>> suitability of EC+cache is very dependent on how much hot data you >>> have, etc...good luck! >>> -Greg >>> >>>> >>>> many thanks, >>>> >>>> Jake Grimmett >>>> _______________________________________________ >>>> ceph-users mailing list >>>> ceph-users@lists.ceph.com >>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >> >> Thanks for your help - much appreciated. >> >> The "set_max_mds 0" command worked, but only after I rebooted the server, >> and restarted ceph twice. Before this I still got an >> "mds active" error, and so was unable to destroy the cephfs. >> >> Possibly I was being impatient, and needed to let mds go inactive? there >> were ~1 million files on the system. >> >> [root@ceph1 ~]# ceph mds set_max_mds 0 >> max_mds = 0 >> >> [root@ceph1 ~]# ceph mds stop 0 >> telling mds.0 10.1.0.86:6811/3249 to deactivate >> >> [root@ceph1 ~]# ceph mds stop 0 >> Error EEXIST: mds.0 not active (up:stopping) >> >> [root@ceph1 ~]# ceph fs rm cephfs2 >> Error EINVAL: all MDS daemons must be inactive before removing filesystem >> >> There shouldn't be any other mds servers running.. >> [root@ceph1 ~]# ceph mds stop 1 >> Error EEXIST: mds.1 not active (down:dne) >> >> At this point I rebooted the server, did a "service ceph restart" twice. >> Shutdown ceph, then restarted ceph before this command worked: >> >> [root@ceph1 ~]# ceph fs rm cephfs2 --yes-i-really-mean-it >> >> Anyhow, I've now been able to create an erasure coded pool, with a >> replicated tier which cephfs is running on :) >> >> *Lots* of testing to go! >> >> Again, many thanks >> >> Jake >> >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
