The removed snaps is also in the osd map. It does truncate the list over time to show ranges and such and it is definitely annoying, but it is needed for some of the internals of Ceph. I don't remember what they are, but that was the gist of the answer I got back when we were working on some bugs with the Ceph support team previously.
On Wed, Mar 14, 2018 at 5:38 AM linghucongsong <linghucongsong@xxxxxxx> wrote:
what is the purpose for we to show the removed snaps? look like the removed snaps no use to the user. we use rbd export and import backup images from one ceph cluster to another ceph cluster. the increment image backup depand on the snap.and we wiil remove the snap after the backup.so it will show a lot of snaps removed like below!
'volumes' replicated size 2 min_size 1 crush_rule 1 object_hash rjenkins pg_num 128 pgp_num 128 last_change 5554 flags hashpspool stripe_width 0 application rbd
removed_snaps [1~4,6~5f,66~149,1b0~660,811~1,813~1,815~1,817~1,819~1,81b~1,81d~1,81f~1,821~1,823~1,825~1,827~1,829~1,82b~1,82d~1,82f~1,831~1,833~1,835~1,837~1,839~1,83b~1,83d~1,83f~1,841~1,843~1,845~1,847~1,849~1,84b~1,84d~1,84f~1,851~1,853~1,855~1,857~1,859~1,85b~1,85d~1,85f~1,861~1,863~1,865~1,867~1,869~1,86b~1,86d~1,86f~1,871~1,873~1,875~1,877~1,879~1,87b~1,87d~1,87f~1,881~1,883~1,885~1,887~1,889~1,88b~1,88d~1,88f~1,891~1,893~1,895~1,897~1,899~1,89b~1,89d~1,89f~1,8a1~1,8a3~1,8a5~1,8a7~1,8a9~1,8ab~1,8ad~1,8af~1,8b1~1,8b3~1,8b5~1,8b7~1,8b9~1,8bb~1,8bd~1,8bf~1,8c1~1,8c3~1,8c5~1,8c7~1,8c9~1,8cb~1,8cd~1,8cf~1,8d1~1,8d3~1,8d5~1,8d7~1,8d9~1,8db~1,8dd~1,8df~1,8e1~1,8e3~1,8e5~1,8e7~1,8e9~1,8eb~1,8ed~1,8ef~1,8f1~1,8f3~1,8f5~1,8f7~1,8f9~1,8fb~1,8fd~1,8ff~1,901~1,903~1,905~1,907~1,909~1,90b~1,90d~1,90f~1,911~1,913~1,915~1,917~1,919~1,91b~1,91d~1,91f~1,921~1]_______________________________________________
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