Hi Alex,

We had a bigger problem recently which involved the error you mention. I sent it to the mail list and you can find the final solution we chose at [1]. Not the cleanest solution of course, but we managed to recover all VMs... I think in your case the relevant part is the one that mention the "vdsClient setVolumeLegality" command, although I don't know the root reason why you're getting the error (might be a corrupt snapshot, as in our case)...

Hope this helps.

  [1]: https://www.mail-archive.com/users@ovirt.org/msg49300.html

El 2018-07-11 09:16, Alex K escribió:
Due to urgency of the case, I fetched the backup copy from weekend and
proceeded to push missing data to VM (the VM is a git repo). I lost
few notes, though not much damage was done...
I'm starting to feel uncomfortable with this solution though and might
switch (at least the production VMs) to plain KVM where I had never
experienced such issues.

Alex

On Wed, Jul 11, 2018 at 7:27 AM, Yedidyah Bar David <d...@redhat.com>
wrote:

(Changing subject, adding Freddy)

On Tue, Jul 10, 2018 at 8:06 PM, Alex K <rightkickt...@gmail.com>
wrote:

Hi all,

I did a routine maintenance today (updating the hosts) to ovirt
cluster (4.2) and I have one VM that was complaining about an
invalid snapshot. After shutdown of VM the VM is not able to start
again, giving the error:

VM Gitlab is down with error. Exit message: Bad volume
specification {'serial': 'b6af2856-a164-484a-afe5-9836bbdd14e8',
'index': 0, 'iface': 'virtio', 'apparentsize': '51838976',
'specParams': {}, 'cache': 'none', 'imageID':
'b6af2856-a164-484a-afe5-9836bbdd14e8', 'truesize': '52011008',
'type': 'disk', 'domainID':
'142bbde6-ef9d-4a52-b9da-2de533c1f1bd', 'reqsize': '0', 'format':
'cow', 'poolID': '00000001-0001-0001-0001-000000000311', 'device':
'disk', 'path':


'/rhev/data-center/00000001-0001-0001-0001-000000000311/142bbde6-ef9d-4a52-b9da-2de533c1f1bd/images/b6af2856-a164-484a-afe5-9836bbdd14e8/f3125f62-c909-472f-919c-844e0b8c156d',
'propagateErrors': 'off', 'name': 'vda', 'bootOrder': '1',
'volumeID': 'f3125f62-c909-472f-919c-844e0b8c156d', 'diskType':
'file', 'alias': 'ua-b6af2856-a164-484a-afe5-9836bbdd14e8',
'discard': False}.

I see also the following error:

VDSM command CopyImageVDS failed: Image is not a legal chain:
(u'b6af2856-a164-484a-afe5-9836bbdd14e8',)

This error appears a few more times in the list's archive, all of
which seem to be related to rather-old bugs (3.5/3.6 times) or
storage problems. I assume you use 4.2. Are you sure the corruption
happened only now? Did working with snapshots worked well before the
upgrade?

 

Seems as a corrupt VM disk?

Seems so to me, but I am not a storage expert.

 

The VM had 3 snapshots. I was able to delete one from GUI then am
not able to delete the other two as the task fails. Generally I am
not allowed to clone, export or do sth to the VM.
 

Have you encountered sth similar. Any advice?

The lastest post, from 2016, included a workaround, you might (very
carefully!) try that.

I suggest to also open a bug and attach all relevant logs (engine,
vdsm from all relevant hosts, including SPMs at time of snapshot
operations and any other host that ran the VM), and try to give
accurate reproduction steps.

Best regards,
--

Didi


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