Hello Cephers,
I’m trying to understand Cephfs design and specially how file system view reflect OSD pools in order to perform a backup / restore operation (VM context).
I’m able to backup and restore sucessfully OSDs but I have some issues with filesystem layer.
When I create files after backup time, after OSD restoration I’m still seeing these files even if they are not usable (since osd do not have knowledge of these).
I tried to shutdown/start fs before/after restoration but no change
Same no luck with journal export/import
I had a look at http://docs.ceph.com/docs/mimic/cephfs/disaster-recovery/ but since I do not really know what’s beneath all the tools/procedures, I don’t know how to start with this
I know there’s a really usefull feature called cephfs snapshot (.snap) but for some reasons I could not use it here.
Could someone kind enough to guide me ?
My goal is to restore datas and cephfs layer.
OSD restoration seems ok but how to make cephfs consistent with the OSD pool restoration ?
Is there some cache files somewhere on MDS to refresh ? (did not find any)
Or maybe something wrong with the OSD metadata pool linked to my cephfs fs but I don’t really know how to check
I’m using Ceph Mimic (ceph version 13.2.5 (cbff874f9007f1869bfd3821b7e33b2a6ffd4988) mimic (stable)) with 3 MDS / 1 active and bluestore
Thank you for your precious help !
Vincent
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