On Thu, Jul 1, 2021 at 9:48 AM Jan Kasprzak <kas@xxxxxxxxxx> wrote:
>
> Ilya Dryomov wrote:
> : On Thu, Jul 1, 2021 at 8:37 AM Jan Kasprzak <kas@xxxxxxxxxx> wrote:
> : >
> : > Hello, Ceph users,
> : >
> : > How can I figure out why it is not possible to unprotect a snapshot
> : > in a RBD image? I use this RBD pool for OpenNebula, and somehow there
> : > is a snapshot in one image, which OpenNebula does not see. So I wanted
> : > to delete the snapshot:
> : >
> : > # rbd info one/one-1312
> : > rbd image 'one-1312':
> : > size 8 GiB in 2048 objects
> : > order 22 (4 MiB objects)
> : > snapshot_count: 1
> : > id: 6732dccd50fa75
> : > block_name_prefix: rbd_data.6732dccd50fa75
> : > format: 2
> : > features: layering, exclusive-lock, object-map, fast-diff, deep-flatten
> : > op_features:
> : > flags:
> : > create_timestamp: Wed Jun 30 10:41:59 2021
> : > access_timestamp: Wed Jun 30 16:48:30 2021
> : > modify_timestamp: Wed Jun 30 15:52:18 2021
> : >
> : > # rbd snap ls one/one-1312
> : > SNAPID NAME SIZE PROTECTED TIMESTAMP
> : > 1727 snap 8 GiB yes Wed Jun 30 16:11:39 2021
> : >
> : > # rbd snap rm one/one-1312@snap
> : > Removing snap: 0% complete...failed.
> : > rbd: snapshot 'snap' is protected from removal.
> : > 2021-07-01 08:33:41.489 7f79c6ffd700 -1 librbd::Operations: snapshot is protected
> : >
> : > # rbd snap unprotect one/one-1312@snap
> : > 2021-07-01 08:28:40.747 7f3cb6ffd700 -1 librbd::SnapshotUnprotectRequest: cannot unprotect: at least 1 child(ren) [68ba8e7bace188] in pool 'one'
> : > 2021-07-01 08:28:40.749 7f3cb6ffd700 -1 librbd::SnapshotUnprotectRequest: encountered error: (16) Device or resource busy
> : > 2021-07-01 08:28:40.749 7f3cb6ffd700 -1 librbd::SnapshotUnprotectRequest: 0x56522f10e830 should_complete_error: ret_val=-16
> : > rbd: unprotecting snap failed: 2021-07-01 08:28:40.751 7f3cb6ffd700 -1 librbd::SnapshotUnprotectRequest: 0x56522f10e830 should_complete_error: ret_val=-16
> : >
> : > As far as I can see neither the snapshot nor the RBD image itself is
> : > used by a running qemu in my cluster. How can I delete the snapshot
> : > or debug the problem further?
> :
> : Hi Jan,
> :
> : There seems to be a clone image that is based on that snapshot.
> : "rbd children one/one-1312@snap" should give you its name.
>
> Hi Ilya,
>
> thanks for the tip. But apparently there seem to be no children
> of the snap or the base image:
>
> # rbd children one/one-1312@snap
> # rbd children one/one-1312
It is probably in the trash. Try "rbd children -a one/one-1312@snap"
or "rbd trash ls -a one".
Thanks,
Ilya
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