[ceph-users] Using Cephfs Snapshots in Luminous

[Felix Stolte]

Hi folks,

is anybody using cephfs with snapshots on luminous? Cephfs snapshots are
declared stable in mimic, but I'd like to know about the risks using
them on luminous. Do I risk a complete cephfs failure or just some not
working snapshots? It is one namespace, one fs, one data and one
metadata pool.

Also I'd like to know if there is a way to list all current snapshot
(folders) in cephfs. Since a snaphot is created by the mkdir command,
snapshot creation can be done by every user and I would like to monitor
snapshotted folders and snaphshot size (if possible).

Best regards

Felix

Forschungszentrum JÃŒlich GmbH
52425 JÃŒlich
Sitz der Gesellschaft: JÃŒlich
Eingetragen im Handelsregister des Amtsgerichts DÃŒren Nr. HR B 3498
Vorsitzender des Aufsichtsrats: MinDir. Dr. Karl Eugen Huthmacher
GeschÀftsfÌhrung: Prof. Dr.-Ing. Wolfgang Marquardt (Vorsitzender),
Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt,
Prof. Dr. Sebastian M. Schmidt

[Yan, Zheng]

Post by Felix Stolte
Hi folks,
is anybody using cephfs with snapshots on luminous? Cephfs snapshots are
declared stable in mimic, but I'd like to know about the risks using
them on luminous. Do I risk a complete cephfs failure or just some not
working snapshots? It is one namespace, one fs, one data and one
metadata pool.

For luminous, snapshot in single mds setup basically works. But
snapshot is complete broken in multiple setup.

Post by Felix Stolte
Also I'd like to know if there is a way to list all current snapshot
(folders) in cephfs. Since a snaphot is created by the mkdir command,
snapshot creation can be done by every user and I would like to monitor
snapshotted folders and snaphshot size (if possible).

In mimic, there is command "ceph daemon mds.x dump snaps"

Post by Felix Stolte
Best regards
Felix
Forschungszentrum Jülich GmbH
52425 Jülich
Sitz der Gesellschaft: Jülich
Eingetragen im Handelsregister des Amtsgerichts Düren Nr. HR B 3498
Vorsitzender des Aufsichtsrats: MinDir. Dr. Karl Eugen Huthmacher
Geschäftsführung: Prof. Dr.-Ing. Wolfgang Marquardt (Vorsitzender),
Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt,
Prof. Dr. Sebastian M. Schmidt
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[Marc Roos]

Post by Yan, Zheng

Post by Felix Stolte
is anybody using cephfs with snapshots on luminous? Cephfs snapshots
are declared stable in mimic, but I'd like to know about the risks
using them on luminous. Do I risk a complete cephfs failure or just
some not working snapshots? It is one namespace, one fs, one data and
one metadata pool.

For luminous, snapshot in single mds setup basically works. But

snapshot is

Post by Yan, Zheng
complete broken in multiple setup.

Single active mds not? And hardlinks are not supported with snapshots?