[ovirt-users] critical production issue for a vm

[Maor Lipchuk]

On Wed, Dec 6, 2017 at 12:30 PM, Nicolas Ecarnot <nicolas at ecarnot.net>
wrote:

> Le 06/12/2017 à 11:21, Nathanaël Blanchet a écrit :
>
>> Hi all,
>>
>> I'm about to lose one very important vm. I shut down this vm for
>> maintenance and then I moved the four disks to a new created lun. This vm
>> has 2 snapshots.
>>
>> After successful move, the vm refuses to start with this message:
>>
>> Bad volume specification {u'index': 0, u'domainID':
>> u'961ea94a-aced-4dd0-a9f0-266ce1810177', 'reqsize': '0', u'format':
>> u'cow', u'bootOrder': u'1', u'discard': False, u'volumeID':
>> u'a0b6d5cb-db1e-4c25-aaaf-1bbee142c60b', 'apparentsize': '2147483648
>> <(214)%20748-3648>', u'imageID': u'4a95614e-bf1d-407c-aa72-2df414abcb7a',
>> u'specParams': {}, u'readonly': u'false', u'iface': u'virtio', u'optional':
>> u'false', u'deviceId': u'4a95614e-bf1d-407c-aa72-2df414abcb7a',
>> 'truesize': '2147483648 <(214)%20748-3648>', u'poolID':
>> u'48ca3019-9dbf-4ef3-98e9-08105d396350', u'device': u'disk', u'shared':
>> u'false', u'propagateErrors': u'off', u'type': u'disk'}.
>>
>> I tried to merge the snaphots, export , clone from snapshot, copy disks,
>> or deactivate disks and every action fails when it is about disk.
>>
>> I began to dd lv group to get a new vm intended to a standalone
>> libvirt/kvm, the vm quite boots up but it is an outdated version before the
>> first snapshot. There is a lot of disks when doing a "lvs | grep 961ea94a"
>> supposed to be disks snapshots. Which of them must I choose to get the last
>> vm before shutting down? I'm not used to deal snapshot with virsh/libvirt,
>> so some help will be much appreciated.
>>
>
The disks which you want to copy should contain the entire volume chain.
Based on the log you mentioned, It looks like this image is problematic:

  storage id: '961ea94a-aced-4dd0-a9f0-266ce1810177',
  imageID': u'4a95614e-bf1d-407c-aa72-2df414abcb7a
  volumeID': u'a0b6d5cb-db1e-4c25-aaaf-1bbee142c60b'

What if you try to deactivate this image and try to run the VM, will it run?




>
>> Is there some unknown command to recover this vm into ovirt?
>>
>> Thank you in advance.
>>
>>
>>




>
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>>
>>
> Beside specific oVirt answers, did you try to get informations about the
> snapshot tree with qemu-img info --backing-chain on the adequate /dev/...
> logical volume?
> As you know how to dd from LVs, you could extract every needed snapshots
> files and rebuild your VM outside of oVirt.
> Then take time to re-import it later and safely.
>
> --
> Nicolas ECARNOT
> _______________________________________________
> Users mailing list
> Users at ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
>
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