I haven't found anything other the leaks issue, you can try to run
$ qemu-img check -r leaks <img> 
(make sure to have it backed up)

On Tue, Feb 26, 2019 at 5:40 PM Alan G <alan+ovirt@griff.me.uk> wrote:
Logs are attached. The first error from snapshot deletion is at 2019-02-26 13:27:11,877Z in the engine log.


---- On Tue, 26 Feb 2019 15:11:39 +0000 Benny Zlotnik <bzlotnik@redhat.com> wrote ----

Can you provide full vdsm & engine logs?

On Tue, Feb 26, 2019 at 5:10 PM Alan G <alan+ovirt@griff.me.uk> wrote:

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Hi,


I performed the following: -

1. Shutdown VM.
2. Take a snapshot
3. Create a clone from snapshot.
4. Start the clone. Clone starts fine.
5. Attempt to delete snapshot from original VM, fails.
6. Attempt to start original VM, fails with "Bad volume specification".

This was logged in VDSM during the snapshot deletion attempt.

2019-02-26 13:27:10,907+0000 ERROR (tasks/3) [storage.TaskManager.Task] (Task='67577e64-f29d-4c47-a38f-e54b905cae03') Unexpected error (task:872)
Traceback (most recent call last):
  File "/usr/share/vdsm/storage/task.py", line 879, in _run
    return fn(*args, **kargs)
  File "/usr/share/vdsm/storage/task.py", line 333, in run
    return self.cmd(*self.argslist, **self.argsdict)
  File "/usr/lib/python2.7/site-packages/vdsm/storage/securable.py", line 79, in wrapper
    return method(self, *args, **kwargs)
  File "/usr/share/vdsm/storage/sp.py", line 1892, in finalizeMerge
    merge.finalize(subchainInfo)
  File "/usr/share/vdsm/storage/merge.py", line 271, in finalize
    optimal_size = subchain.base_vol.optimal_size()
  File "/usr/share/vdsm/storage/blockVolume.py", line 440, in optimal_size
    check = qemuimg.check(self.getVolumePath(), qemuimg.FORMAT.QCOW2)
  File "/usr/lib/python2.7/site-packages/vdsm/qemuimg.py", line 157, in check
    out = _run_cmd(cmd)
  File "/usr/lib/python2.7/site-packages/vdsm/qemuimg.py", line 426, in _run_cmd
    raise QImgError(cmd, rc, out, err)
QImgError: cmd=['/usr/bin/qemu-img', 'check', '--output', 'json', '-f', 'qcow2', '/rhev/data-center/mnt/blockSD/024109d5-ea84-47ed-87e5-1c8681fdd177/images/f7dea7bd-04
6c-4923-b5a5-d0c1201607fc/ac540314-989d-42c2-9e7e-3907eedbe27f'], ecode=3, stdout={
    "image-end-offset": 52210892800,
    "total-clusters": 1638400,
    "check-errors": 0,
    "leaks": 323,
    "leaks-fixed": 0,
    "allocated-clusters": 795890,
    "filename": "/rhev/data-center/mnt/blockSD/024109d5-ea84-47ed-87e5-1c8681fdd177/images/f7dea7bd-046c-4923-b5a5-d0c1201607fc/ac540314-989d-42c2-9e7e-3907eedbe27f",
    "format": "qcow2",
    "fragmented-clusters": 692941
}
, stderr=Leaked cluster 81919 refcount=1 reference=0
Leaked cluster 81920 refcount=1 reference=0
Leaked cluster 81921 refcount=1 reference=0
etc..

Is there any way to fix these leaked clusters? 

Running oVirt 4.1.9 with FC block storage.

Thanks,

Alan

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