[ceph-users] unusual growth in cluster after replacing journalSSDs

Jogi Hofmüller jogi at mur.at
Thu Nov 16 23:15:17 PST 2017


Hi,

Am Donnerstag, den 16.11.2017, 13:44 +0100 schrieb Burkhard Linke:

> > What remains is the growth of used data in the cluster.
> > 
> > I put background information of our cluster and some graphs of
> > different metrics on a wiki page:
> > 
> >    https://wiki.mur.at/Dokumentation/CephCluster
> > 
> > Basically we need to reduce the growth in the cluster, but since we
> > are
> > not sure what causes it we don't have an idea.
> 
> Just a wild guess (wiki page is not accessible yet):

Oh damn, sorry! Fixed that.  The wiki page is accessible now.

> Are you sure that the journals were creating on the new SSD? If the 
> journals were created as files in the OSD directory, their size might
> be accounted for in the cluster size report (assuming OSDs are
> reporting their free space, not a sum of all object sizes).

Yes, I am sure.  Just checked and all the journal links point to the
correct devices.  See OSD 5 as an example:

ls -l /var/lib/ceph/osd/ceph-5
total 64
-rw-r--r--   1 root root   481 Mar 30  2017 activate.monmap
-rw-r--r--   1 ceph ceph     3 Mar 30  2017 active
-rw-r--r--   1 ceph ceph    37 Mar 30  2017 ceph_fsid
drwxr-xr-x 342 ceph ceph 12288 Apr  6  2017 current
-rw-r--r--   1 ceph ceph    37 Mar 30  2017 fsid
lrwxrwxrwx   1 root root    58 Oct 17 14:43 journal -> /dev/disk/by-
partuuid/f04832e3-2f09-460e-806f-4a6fe7aa1425
-rw-r--r--   1 ceph ceph    37 Oct 25 11:12 journal_uuid
-rw-------   1 ceph ceph    56 Mar 30  2017 keyring
-rw-r--r--   1 ceph ceph    21 Mar 30  2017 magic
-rw-r--r--   1 ceph ceph     6 Mar 30  2017 ready
-rw-r--r--   1 ceph ceph     4 Mar 30  2017 store_version
-rw-r--r--   1 ceph ceph    53 Mar 30  2017 superblock
-rw-r--r--   1 ceph ceph     0 Nov  7 11:45 systemd
-rw-r--r--   1 ceph ceph    10 Mar 30  2017 type
-rw-r--r--   1 ceph ceph     2 Mar 30  2017 whoami

Regards,
-- 
J.Hofmüller

           Nisiti
           - Abie Nathan, 1927-2008

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