[ovirt-users] Snapshot or not?

Demeter Tibor tdemeter at itsmart.hu
Fri Nov 17 07:50:30 UTC 2017 

Hi, 

https://pastebin.com/raw/cFrphHHh 

The problematic disk is 
<disk type='file' device='disk' snapshot='no'>
      <driver name='qemu' type='raw' cache='none' error_policy='stop' io='threads'/>
      <source file='/rhev/data-center/bcc17ec5-3ba3-4664-ba47-24fde9d92a2a/d2f65815-5f25-4740-ba56-76749a0f4571/images/d1db6e0e-87d0-4124-8326-b18bff3fdf90/5974fd33-af4c-4e3b-aadb-bece6054eb6b'>
        <seclabel model='selinux' relabel='no'/>
      </source>
      <target dev='vdc' bus='virtio'/>
      <serial>d1db6e0e-87d0-4124-8326-b18bff3fdf90</serial>
      <alias name='virtio-disk2'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
    </disk> 

What can I do? 

Thank you for your time! 

Tibor 

----- 2017. nov.. 16., 22:40, Nir Soffer <nsoffer at redhat.com> írta: 

> On Thu, Nov 16, 2017 at 7:11 PM Demeter Tibor < [ mailto:tdemeter at itsmart.hu |
> tdemeter at itsmart.hu ] > wrote:

>> Hi,
>> Sorry for my bad English:(

>> Ovirt could not import my VM and disks from original storge-domain. It is an NFS
>> share on a server.
>> Then I create an another NFS share on same storage and attached to ovirt as new
>> storgae domain.
>> At this step I've created a new VM on new storage-domain with same disks. (three
>> think provisioned, 100GB, 60GB and 13TB disks). It was necessary, because ovirt
>> cant import my original disks and VM from the re-attached storage domain.
>> Finally I renamed my old disks from old storage domain to new on new storgae
>> domain (it was possible because are there on same file system on nfs server)
>> At this moment only two virtual disk working fine. The 100 and 60GB disks does
>> working fine, but the 13TB is not. It has a snapshot. Or not? Is it a snapshot
>> or not?

>> My problem is inside VM I see the content as raw disk. I thing Ovirt don't want
>> to use it as a snapshotted image. Or what ?

> Demeter, can you share the output of this command on a host running your vm?

> virsh -r dumpxml vm-name

> Nir

>> Thank you.

>> Tibor

>> ----- 2017. nov.. 16., 15:57, Benny Zlotnik < [ mailto:bzlotnik at redhat.com |
>> bzlotnik at redhat.com ] > írta:

>>> Hi Tibor,
>>> Can you please explain this part: " After this I just wondered, I will make a
>>> new VM with same disk and I will copy the images (really just rename) from
>>> original to recreated."
>>> What were the exact steps you took?

>>> Thanks

>>> On Thu, Nov 16, 2017 at 4:19 PM, Demeter Tibor < [ mailto:tdemeter at itsmart.hu |
>>> tdemeter at itsmart.hu ] > wrote:

>>>> Hi,

>>>> Thank you for your reply.

>>>> So. I have a disk with snapshot. Or - really - I just think that is a snapshot.
>>>> It was attached originally to a VM (with other two disks, that is not have
>>>> snapshot) I did a detach-attach-storage procedure, but after attach, - I don't
>>>> know why - ovirt could not import the VM and disks from this (ovirt said it is
>>>> not possible). After this I just wondered, I will make a new VM with same disk
>>>> and I will copy the images (really just rename) from original to recreated.

>>>> It was partial success because the VM can boot, but the disk, where there is a
>>>> snapshot I can't read the LVM table. I see just it seems to corrupt.
>>>> Now this disk in a very interested state: I can see the snapshot datas from the
>>>> vm as raw disk.
>>>> I think Ovirt don't know that is a snapshotted image and attach to VM as raw
>>>> disk.

>>>> So my really question, how can I add this disk image as good to ovirt?

>>>> Please help me, it is very important me.:(

>>>> Thanks in advance,

>>>> Have a nice day,

>>>> Tibor

>>>> ----- 2017. nov.. 16., 11:55, Ala Hino < [ mailto:ahino at redhat.com |
>>>> ahino at redhat.com ] > írta:

>>>>> Hi Tibor,
>>>>> I am not sure I completely understand the scenario.

>>>>> You have a VM with two disks and then you create a snapshot including the two
>>>>> disks?
>>>>> Before creating the snapshot, did the VM recognize the two disks?

>>>>> On Mon, Nov 13, 2017 at 10:36 PM, Demeter Tibor < [ mailto:tdemeter at itsmart.hu |
>>>>> tdemeter at itsmart.hu ] > wrote:

>>>>>> Dear Users,

>>>>>> I have a disk of a vm, that is have a snapshot. It is very interesting, because
>>>>>> there are two other disk of that VM, but there are no snapshots of them.
>>>>>> I found this while I've try to migrate a storage-domain between two datacenter.
>>>>>> Because, I didn't import that vm from the storage domain, I did an another
>>>>>> similar VM with exactly same sized thin-provisioned disks. I have renamed,
>>>>>> copied to here my originals.

>>>>>> The VM started successfully, but the disk that contain a snapshot did not
>>>>>> recognized by the os. I can see the whole disk as raw. (disk id, format in
>>>>>> ovirt, filenames of images, etc) . I think ovirt don't know that is a
>>>>>> snapshotted image and use as raw. Is it possible?
>>>>>> I don't see any snapshot in snapshots. Also I have try to list snapshots with
>>>>>> qemu-img info and qemu-img snapshot -l , but it does not see any snapshots in
>>>>>> the image.

>>>>>> Really, I don't know how is possible this.

>>>>>> [root at storage1 8d815282-6957-41c0-bb3e-6c8f4a23a64b]# qemu-img info
>>>>>> 5974fd33-af4c-4e3b-aadb-bece6054eb6b
>>>>>> image: 5974fd33-af4c-4e3b-aadb-bece6054eb6b
>>>>>> file format: qcow2
>>>>>> virtual size: 13T (13958643712000 bytes)
>>>>>> disk size: 12T
>>>>>> cluster_size: 65536
>>>>>> backing file:
>>>>>> ../8d815282-6957-41c0-bb3e-6c8f4a23a64b/723ad5aa-02f6-4067-ac75-0ce0a761627f
>>>>>> backing file format: raw
>>>>>> Format specific information:
>>>>>> compat: 0.10

>>>>>> [root at storage1 8d815282-6957-41c0-bb3e-6c8f4a23a64b]# qemu-img info
>>>>>> 723ad5aa-02f6-4067-ac75-0ce0a761627f
>>>>>> image: 723ad5aa-02f6-4067-ac75-0ce0a761627f
>>>>>> file format: raw
>>>>>> virtual size: 2.0T (2147483648000 bytes)
>>>>>> disk size: 244G

>>>>>> [root at storage1 8d815282-6957-41c0-bb3e-6c8f4a23a64b]# ll
>>>>>> total [ tel:(309)%20698-7560 | 13096987560 ]
>>>>>> -rw-rw----. 1 36 36 13149448896512 Nov 13 13:42
>>>>>> 5974fd33-af4c-4e3b-aadb-bece6054eb6b
>>>>>> -rw-rw----. 1 36 36 1048576 Nov 13 19:34
>>>>>> 5974fd33-af4c-4e3b-aadb-bece6054eb6b.lease
>>>>>> -rw-r--r--. 1 36 36 262 Nov 13 19:54 5974fd33-af4c-4e3b-aadb-bece6054eb6b.meta
>>>>>> -rw-rw----. 1 36 36 2147483648000 Jul 8 2016
>>>>>> 723ad5aa-02f6-4067-ac75-0ce0a761627f
>>>>>> -rw-rw----. 1 36 36 1048576 Jul 7 2016
>>>>>> 723ad5aa-02f6-4067-ac75-0ce0a761627f.lease
>>>>>> -rw-r--r--. 1 36 36 335 Nov 13 19:52 723ad5aa-02f6-4067-ac75-0ce0a761627f.meta

>>>>>> qemu-img snapshot -l 5974fd33-af4c-4e3b-aadb-bece6054eb6b

>>>>>> (nothing)

>>>>>> Because it is a very big (13 TB) disk I can't migrate to an another image,
>>>>>> because I don't have enough free space. So I just would like to use it in ovirt
>>>>>> like in the past.

>>>>>> I have a very old ovirt (3.5)

>>>>>> How can I use this disk?

>>>>>> Thanks in advance,

>>>>>> Regards,

>>>>>> Tibor

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