Re: CephFS: no MDS does join the filesystem

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Yeah, seems like the help output is incomplete. But this seems to work (use "init" before "--filesystem"):

# cephfs-data-scan init --filesystem secondfs
Inode 0x0x1 already exists, skipping create. Use --force-init to overwrite the existing object. Inode 0x0x100 already exists, skipping create. Use --force-init to overwrite the existing object.

Zitat von Robert Sander <r.sander@xxxxxxxxxxxxxxxxxxx>:

Hi,

Am 7/14/25 um 15:06 schrieb Eugen Block:

# cephfs-table-tool secondfs:0 show session

That works. But what about cephfs-data-scan?

# cephfs-data-scan init
Specify a filesystem with --filesystem
Error ((22) Invalid argument)
# cephfs-data-scan --filesystem test init
Unknown argument 'test'
Error ((22) Invalid argument)
# cephfs-data-scan --filesystem=test init
Unknown argument 'init'
Error ((22) Invalid argument)
# cephfs-data-scan init --filesystem=test
Unknown argument '--filesystem=test'
Error ((22) Invalid argument)

# cephfs-data-scan --help
does not even list "--filesystem" as a valid argument.

Regards
--
Robert Sander
Linux Consultant

Heinlein Consulting GmbH
Schwedter Str. 8/9b, 10119 Berlin

https://www.heinlein-support.de

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