We do have 2 ceph (9.2.1) clusters, where one is sending snaphots of pools to the other one for backup purposes.
Snapshots are fine, however the ceph pool get's blown up by sizes not
matching the snapshots.
Here's the size of a snapshot and the resulting cluster usage
afterwards. The snapshot is ~2GB, but the cluster itself increases by
~300GB (every night)
# rbd diff --from-snap 20161017-010003 pool2/image@20161018-010005
--format plain | awk '{ SUM += $2 } END { print SUM/1024/1024/1024 " GB" }'
2.29738 GB
--- before snap ---
GLOBAL:
SIZE AVAIL RAW USED %RAW USED
4947G 2953G 1993G 40.29
-- after snap ---
GLOBAL:
SIZE AVAIL RAW USED %RAW USED
4947G 2627G 2319G 46.88
The originating one behaves correctly. (Increases bit more due to other
pools and images)
# rbd diff --from-snap 20161017-010003 pool1/image@20161018-010005
--format plain | awk '{ SUM += $2 } END { print SUM/1024/1024/1024 " GB" }'
2.29738 GB
--- before snap ---
GLOBAL:
SIZE AVAIL RAW USED %RAW USED
2698G 1292G 1405G 52.10
-- after snap ---
GLOBAL:
SIZE AVAIL RAW USED %RAW USED
2698G 1288G 1409G 52.24
Any ideas where to have a look?
regards
Stefan
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