Hi Robert, although I would assume that deleting the pool is safe, I'd rather try to get to the bottom of this as well. Do you still have access to the directories to check for snapshots (.snap directories underneath the root filesystem mount)? Zitat von Robert Sander <r.sander@heinlein-support.de>:
Hi,
there is an old cluster (9 years) that gets constantly upgraded and is currently running version 17.2.7.
3 years ago (when running version 16) a new EC pool was added to the existing CephFS to be used with the directory layout feature.
Now it was decided to remove that pool again. On the filesystem level all files have been copied to the original replicated pool and then deleted. No files or directories have the EC pool in their extended attributes referenced.
But still this EC pool has appr 242 million objects with a total of ca 600 TB data stored. This shows up in "ceph df" and "ceph pg dump".
The objects can be listed with "rados ls" but a "rados stat" or "rados get" will yield an error:
error stat-ing cephfs_data_ec/1001275b3fe.00000241: (2) No such file or directory
How can this be? Are these artifacts from not properly removed snapshots?
Is it really save to remove this pool from CephFS and delete it?
Regards -- Robert Sander Heinlein Support GmbH Linux: Akademie - Support - Hosting http://www.heinlein-support.de
Tel: 030-405051-43 Fax: 030-405051-19
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