Hi Marc,
thank you for the response. Since upgrading to nautilus I also encounter the cache pressure warnings while doing tape backup of the filesystem, so it is probably not related to snapshots.
Anyone else who likes to share his experience with cephfs snapshots?
Best regards
Felix
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Forschungszentrum Juelich GmbH
52425 Juelich
Sitz der Gesellschaft: Juelich
Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498
Vorsitzender des Aufsichtsrats: MinDir Dr. Karl Eugen Huthmacher
Geschaeftsfuehrung: Prof. Dr.-Ing. Wolfgang Marquardt (Vorsitzender),
Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt
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Am 06.05.20, 10:30 schrieb "Marc Roos" <M.Roos@xxxxxxxxxxxxxxxxx>:
I have been using snapshots on cephfs since luminous, 1xfs and
1xactivemds and used an rsync on it for backup.
Under luminious I did not encounter any problems with this setup. I
think I was even snapshotting user dirs every 7 days having thousands of
snapshots (which I later heard, is not recommend and one should stick
below 400 or so?)
When upgrading to nautilus, this snapshot feature was disabled (that is
default in the upgrade). Did not notice nor expected this. When I
enabled again snapshotting. I had problems with the rsync backup. So I
reverted back to the slower ceph-fuse mount. I also brought down the
snapshots to 36, but I am still stuck with "clients failing to respond
to capability release", "clients failing to respond to cache pressure"
and "MDSs report slow requests"
Which is odd, since my use did not change since luminous.
All in all is fine, but what I do not like is, that such a thing can
happen between upgrades.
-----Original Message-----
From: Stolte, Felix [mailto:f.stolte@xxxxxxxxxxxxx]
Sent: 06 May 2020 09:09
To: ceph-users@xxxxxxx
Subject: Cephfs snapshots in Nautilus
Hi Folks,
I really like to use snapshots on cephfs, but even on octopus release
snapshots are still marked as an experimental feature. Is anyone using
snapshots in production environments? Which issues did you encounter? Do
I risk a corrupted filesystem or just non-working snapshots?
We run a single fs with one active mds.
Best regards
Felix
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Forschungszentrum Juelich GmbH
52425 Juelich
Sitz der Gesellschaft: Juelich
Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498
Vorsitzender des Aufsichtsrats: MinDir Dr. Karl Eugen Huthmacher
Geschaeftsfuehrung: Prof. Dr.-Ing. Wolfgang Marquardt (Vorsitzender),
Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt
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