Hi,We've a problem to delete a snapshot. There was a child image of the snapshot, but the child image was flatten. And now the snapshot still "think" it has children, and can not be deleted.
Snapshot and children: $ rbd snap ls volumes/volume-49ccf5a6-4c17-434a-a087-f04acef978ef SNAPID NAME SIZE 94183 snapshot-376e23d6-e723-4dbb-b558-174b275244b5 40960 MB$ rbd children volumes/volume-49ccf5a6-4c17-434a-a087-f04acef978ef@snapshot-376e23d6-e723-4dbb-b558-174b275244b5
volumes/volume-a86350ad-2d4e-4863-bff3-67304b4b7b3c Child image (was flatten, and now is without parent): $ rbd info volumes/volume-a86350ad-2d4e-4863-bff3-67304b4b7b3c rbd image 'volume-a86350ad-2d4e-4863-bff3-67304b4b7b3c': size 40960 MB in 10240 objects order 22 (4096 kB objects) block_name_prefix: rbd_data.1d4f6a3cd198f8 format: 2 features: layering, exclusive-lock, object-map flags:When I try to delete the snapshot, ceph tells me that the snapshot is protected. And when I try to unprotect it, it fails telling me there is still a child!?!?
$ rbd snap rm volumes/volume-49ccf5a6-4c17-434a-a087-f04acef978ef@snapshot-376e23d6-e723-4dbb-b558-174b275244b5 rbd: snapshot 'snapshot-376e23d6-e723-4dbb-b558-174b275244b5' is protected from removal. 2017-11-30 11:09:31.054416 7fe80e8f9100 -1 librbd::Operations: snapshot is protected
$ rbd snap unprotect volumes/volume-49ccf5a6-4c17-434a-a087-f04acef978ef@snapshot-376e23d6-e723-4dbb-b558-174b275244b5 2017-11-30 11:09:56.899548 7fc6432cd700 -1 librbd::SnapshotUnprotectRequest: cannot unprotect: at least 1 child(ren) [1d4f6a3cd198f8] in pool 'volumes' 2017-11-30 11:09:56.899578 7fc6432cd700 -1 librbd::SnapshotUnprotectRequest: encountered error: (16) Device or resource busy 2017-11-30 11:09:56.899588 7fc6432cd700 -1 librbd::SnapshotUnprotectRequest: 0xab0d918540 should_complete_error: ret_val=-16 2017-11-30 11:09:56.902702 7fc6432cd700 -1 librbd::SnapshotUnprotectRequest: 0xab0d918540 should_complete_error: ret_val=-16
rbd: unprotecting snap failed: (16) Device or resource busy How can we solve this issue? Cheers, Valery -- SWITCH Valéry Tschopp, Software Engineer Werdstrasse 2, P.O. Box, 8021 Zurich, Switzerland email: valery.tschopp@xxxxxxxxx phone: +41 44 268 1544 30 years of pioneering the Swiss Internet. Celebrate with us at https://swit.ch/30years
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