Thank you Paul. On Wed, Aug 21, 2019 at 5:36 PM Paul Emmerich <paul.emmer...@croit.io> wrote:
> You can't downgrade from Luminous to Kraken.... well officially at least. > > I guess it maybe could somehow work but you'd need to re-create all > the services. For the mon example: delete a mon, create a new old one, > let it sync, etc. > Still a bad idea. > > Paul > > -- > Paul Emmerich > > Looking for help with your Ceph cluster? Contact us at https://croit.io > > croit GmbH > Freseniusstr. 31h > 81247 München > www.croit.io > Tel: +49 89 1896585 90 > > On Wed, Aug 21, 2019 at 1:37 PM nokia ceph <nokiacephus...@gmail.com> > wrote: > > > > Hi Team, > > > > One of our old customer had Kraken and they are going to upgrade to > Luminous . In the process they also requesting for downgrade procedure. > > Kraken used leveldb for ceph-mon data , from luminous it changed to > rocksdb , upgrade works without any issues. > > > > When we downgrade , the ceph-mon does not start and the mon kv_backend > not moving away from rocksdb . > > > > After downgrade , when kv_backend is rocksdb following error thrown by > ceph-mon , trying to load data from rocksdb and end up in this error, > > > > 2019-08-21 11:22:45.200188 7f1a0406f7c0 4 rocksdb: Recovered from > manifest file:/var/lib/ceph/mon/ceph-cn1/store.db/MANIFEST-000716 > succeeded,manifest_file_number is 716, next_file_number is 718, > last_sequence is 311614, log_number is 0,prev_log_number is > 0,max_column_family is 0 > > > > 2019-08-21 11:22:45.200198 7f1a0406f7c0 4 rocksdb: Column family > [default] (ID 0), log number is 715 > > > > 2019-08-21 11:22:45.200247 7f1a0406f7c0 4 rocksdb: EVENT_LOG_v1 > {"time_micros": 1566386565200240, "job": 1, "event": "recovery_started", > "log_files": [717]} > > 2019-08-21 11:22:45.200252 7f1a0406f7c0 4 rocksdb: Recovering log #717 > mode 2 > > 2019-08-21 11:22:45.200282 7f1a0406f7c0 4 rocksdb: Creating manifest 719 > > > > 2019-08-21 11:22:45.201222 7f1a0406f7c0 4 rocksdb: EVENT_LOG_v1 > {"time_micros": 1566386565201218, "job": 1, "event": "recovery_finished"} > > 2019-08-21 11:22:45.202582 7f1a0406f7c0 4 rocksdb: DB pointer > 0x55d4dacf0000 > > 2019-08-21 11:22:45.202726 7f1a0406f7c0 -1 ERROR: on disk data includes > unsupported features: compat={},rocompat={},incompat={9=luminous ondisk > layout} > > 2019-08-21 11:22:45.202735 7f1a0406f7c0 -1 error checking features: (1) > Operation not permitted > > > > We changed the kv_backend file inside /var/lib/ceph/mon/ceph-cn1 to > leveldb and ceph-mon failed with following error, > > > > 2019-08-21 11:24:07.922978 7fc5a25de7c0 -1 WARNING: the following > dangerous and experimental features are enabled: bluestore,rocksdb > > 2019-08-21 11:24:07.922983 7fc5a25de7c0 0 set uid:gid to 167:167 > (ceph:ceph) > > 2019-08-21 11:24:07.923009 7fc5a25de7c0 0 ceph version 11.2.0 > (f223e27eeb35991352ebc1f67423d4ebc252adb7), process ceph-mon, pid 3509050 > > 2019-08-21 11:24:07.923050 7fc5a25de7c0 0 pidfile_write: ignore empty > --pid-file > > 2019-08-21 11:24:07.944867 7fc5a25de7c0 -1 WARNING: the following > dangerous and experimental features are enabled: bluestore,rocksdb > > 2019-08-21 11:24:07.950304 7fc5a25de7c0 0 load: jerasure load: lrc > load: isa > > 2019-08-21 11:24:07.950563 7fc5a25de7c0 -1 error opening mon data > directory at '/var/lib/ceph/mon/ceph-cn1': (22) Invalid argument > > > > Is there any possibility to toggle ceph-mon db between leveldb and > rocksdb? > > Tried to add mon_keyvaluedb = leveldb and filestore_omap_backend = > leveldb in ceph.conf also not worked. > > thanks, > > Muthu > > _______________________________________________ > > ceph-users mailing list > > ceph-users@lists.ceph.com > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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