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.
Thanks,
Ilya
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