Hello,
The snapshot with a cache tier part was answered by Greg Farnum (https://www.mail-archive.com/ceph-users@xxxxxxxxxxxxxx/msg18329.html).
What about fstrim with a cache tier ? It doesn't seem to work.
Also is there a background task that recovers freed blocks
?
Best regards,
Frédéric.
Le 25/03/2015 11:14, Frédéric Nass a
écrit :
Hello,
I have a
few questions regarding snapshots and fstrim with cache tiers.
In the
"cache tier and erasure coding FAQ" related to ICE 1.2 (based
on Firefly), Inktank says "Snapshots are not supported in
conjunction with cache tiers."
What are
the risks of using snapshots with cache tiers ? Would this
"better not use it recommandation" still be true with Giant or
Hammer ?
Regarding
the fstrim command, it doesn't seem to work with cache tiers.
The freed up blocks don't get back in the ceph cluster.
Can someone confirm this ? Is there something we can do to get
those freed up blocks back in the cluster ?
Also, can
we run an fstrim task from the cluster side ? That is, without
having to map and mount each rbd image or rely on the client
to operate this task ?
Best
regards,
--
Frédéric Nass
Sous-direction Infrastructures
Direction du Numérique
Université de Lorraine
email : frederic.nass@xxxxxxxxxxxxxxxx
Tél : +33 3 83 68 53 83
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--
Frédéric Nass
Sous direction des Infrastructures,
Direction du Numérique,
Université de Lorraine.
Tél : 03.83.68.53.83
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