Seems like all the engine logs are full with the same error.

From vdsm.log.16.xz I can see an error which might explain this failure:

2018-02-12 07:51:16,161+0100 INFO (ioprocess communication (40573)) [IOProcess] Starting ioprocess (__init__:447)

2018-02-12 07:51:16,201+0100 INFO (jsonrpc/3) [vdsm.api] FINISH mergeSnapshots return=None from=::ffff:10.0.0.46,57032, flow_id=fd4041b3-2301-44b0-aa65-02bd089f6568, task_id=1be430dc-eeb0-4dc9-92df-3f5b7943c6e0 (api:52)

2018-02-12 07:51:16,275+0100 INFO (jsonrpc/3) [jsonrpc.JsonRpcServer] RPC call Image.mergeSnapshots succeeded in 0.13 seconds (__init__:573)

2018-02-12 07:51:16,276+0100 INFO (tasks/1) [storage.ThreadPool.WorkerThread] START task 1be430dc-eeb0-4dc9-92df-3f5b7943c6e0 (cmd=<bound method Task.commit of <vdsm.storage.task.Task instance at 0x7fa1a0785248>>, args=None) (threadPool:208)

2018-02-12 07:51:16,543+0100 INFO (tasks/1) [storage.Image] sdUUID=47b7c9aa-ef53-48bc-bb55-4a1a0ba5c8d5 vmUUID= imgUUID=ee9ab34c-47a8-4306-95d7-dd4318c69ef5 ancestor=9cdc96de-65b7-4187-8ec3-8190b78c1825 successor=8f595e80-1013-4c14-a2f5-252bce9526fdpostZero=False discard=False (image:1240)

2018-02-12 07:51:16,669+0100 ERROR (tasks/1) [storage.TaskManager.Task] (Task='1be430dc-eeb0-4dc9-92df-3f5b7943c6e0') Unexpected error (task:875)

Traceback (most recent call last):

File "/usr/lib/python2.7/site-packages/vdsm/storage/task.py", line 882, in _run

return fn(*args, **kargs)

File "/usr/lib/python2.7/site-packages/vdsm/storage/task.py", line 336, 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/lib/python2.7/site-packages/vdsm/storage/sp.py", line 1853, in mergeSnapshots

discard)

File "/usr/lib/python2.7/site-packages/vdsm/storage/image.py", line 1251, in merge

srcVol = vols[successor]

KeyError: u'8f595e80-1013-4c14-a2f5-252bce9526fd'

Ala, maybe you know if there is any known issue with mergeSnapshots?

The usecase here are VMs from oVirt 3.5 which got registered to oVirt 4.2.

Regards,

Maor

On Wed, Feb 14, 2018 at 10:11 AM, Enrico Becchetti <enrico.becchetti@pg.infn.it> wrote:

Hi,
also you can download them throught these
links:

https://owncloud.pg.infn.it/index.php/s/QpsTyGxtRTPYRTD

https://owncloud.pg.infn.it/index.php/s/ph8pLcABe0nadeb

Thanks again !!!!
Best Regards
Enrico
Il 13/02/2018 14:52, Maor Lipchuk ha scritto:
On Tue, Feb 13, 2018 at 3:51 PM, Maor Lipchuk <mlipchuk@redhat.com> wrote:

On Tue, Feb 13, 2018 at 3:42 PM, Enrico Becchetti <enrico.becchetti@pg.infn.it> wrote:

see the attach files please ... thanks for your attention !!!

Seems like the engine logs does not contain the entire process, can you please share older logs since the import operation?

And VDSM logs as well from your host
Best Regards
Enrico

Il 13/02/2018 14:09, Maor Lipchuk ha scritto:

On Tue, Feb 13, 2018 at 1:48 PM, Enrico Becchetti <enrico.becchetti@pg.infn.it> wrote:

Dear All,
I have been using ovirt for a long time with three hypervisors and an external engine running in a centos vm .

This three hypervisors have HBAs and access to fiber channel storage. Until recently I used version 3.5, then I reinstalled everything from scratch and now I have 4.2.

Before formatting everything, I detach the storage data domani (FC) with the virtual machines and reimported it to the new 4.2 and all went well. In
this domain there were virtual machines with and without snapshots.

Now I have two problems. The first is that if I try to delete a snapshot the process is not end successful and remains hanging and the second problem is that
in one case I lost the virtual machine !!!

Not sure that I fully understand the scneario.'

How was the virtual machine got lost if you only tried to delete a snapshot?

So I need your help to kill the three running zombie tasks because with taskcleaner.sh I can't do anything and then I need to know how I can delete the old snapshots
made with the 3.5 without losing other data or without having new processes that terminate correctly.

If you want some log files please let me know.

Hi Enrico,

Can you please attach the engine and VDSM logs

Thank you so much.
Best Regards
Enrico

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-- _______________________________________________________________________ Enrico Becchetti Servizio di Calcolo e Reti Istituto Nazionale di Fisica Nucleare - Sezione di Perugia Via Pascoli,c/o Dipartimento di Fisica 06123 Perugia (ITALY) Phone:+39 075 5852777 Mail: Enrico.Becchetti<at>pg.infn.it ______________________________________________________________________
-- 
_______________________________________________________________________

Enrico Becchetti                    Servizio di Calcolo e Reti

Istituto Nazionale di Fisica Nucleare - Sezione di Perugia
Via Pascoli,c/o Dipartimento di Fisica  06123 Perugia (ITALY)
Phone:+39 075 5852777             Mail: Enrico.Becchetti<at>pg.infn.it
______________________________________________________________________ 
-- 
_______________________________________________________________________

Enrico Becchetti                    Servizio di Calcolo e Reti

Istituto Nazionale di Fisica Nucleare - Sezione di Perugia
Via Pascoli,c/o Dipartimento di Fisica  06123 Perugia (ITALY)
Phone:+39 075 5852777             Mail: Enrico.Becchetti<at>pg.infn.it
______________________________________________________________________ 