Re: Unexpected disk write activity with btrfs OSDs

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Thanks!

Just so I understand correctly, the btrfs snapshots are mainly useful if
the journals are on the same disk as the osd, right? Is it indeed safe
to turn them off if the journals are on a separate ssd?

Kind regards,

Erik.


On 22-06-15 20:18, Krzysztof Nowicki wrote:
> pon., 22.06.2015 o 20:09 użytkownik Lionel Bouton
> <lionel-subscription@xxxxxxxxxxx
> <mailto:lionel-subscription@xxxxxxxxxxx>> napisał:
> 
>     On 06/22/15 17:21, Erik Logtenberg wrote:
>     > I have the journals on a separate disk too. How do you disable the
>     > snapshotting on the OSD?
>     http://ceph.com/docs/master/rados/configuration/filestore-config-ref/ :
> 
>     filestore btrfs snap = false
> 
> Once this is done and verified working (after a restart of the OSD) make
> sure to remove the now unnecessary snapshots (snap_xxx) from the osd
> filesystem as failing to do so will cause an increase of occupied space
> over time (old and unneeded versions of objects will remain stored).
> This can be done by running 'sudo btrfs subvolume delete
> /var/lib/ceph/osd/ceph-xx/snap_yy'. To verify that the option change is
> effective you can observe the 'snap_xxx' directories - after disabling
> snapshotting their revision number should not increase any more).
> 
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