[ovirt-users] Re: Import an snapshot of an iSCSI Domain

[Vinícius Ferrão via Users]

Hi Nir and Strahil.

On 6 Mar 2022, at 19:09, Nir Soffer 
mailto:nsof...@redhat.com>> wrote:

On Fri, Mar 4, 2022 at 8:28 AM Vinícius Ferrão via Users
mailto:users@ovirt.org>> wrote:

Hi again, I don’t know if it will be possible to import the storage domain due 
to conflicts with the UUID of the LVM devices. I’ve tried to issue a 
vgimportclone to chance the UUIDs and import the volume but it still does not 
shows up on oVirt.

LVM can change VG/PV UUIDs and names, but storage domain metadata kept in the
VG tags and volume metadata area contain the old VG and PV names and UUIDs,
so it is unlikely to work.

The system is designed so if the original PVs are bad, you can
disconnect them and
connect a backup of the PVs, and import the storage domain again to the system.

Can you explain in more details what you are trying to do?

Nir

What I was trying to accomplish is get some VM snapshots from days ago.

On my storage system it generates a snapshot of the entire disk pool in a daly 
basis. So it was natural, at least for me, to mount a snapshot at a given time 
to export some VMs from those snapshots. The environment had an attack and 
needed to be recovered from it, and rolling back was the approach.

But that what the issue happened, when trying to import the snapshot from the 
iSCSI share it conflicted with the running iSCSI share, since it’s a storage 
snapshot, it have the exactly same metadata.

I think the issue here is a missing feature on oVirt to remap the metadata and 
permit the mount in this situation, right?

What I ended up doing:
* Removed one of the servers from oVirt Cluster / Datacenter
* Reinstalled from the ground
* Fired up a new hosted engine on a new iSCSI HE dedicated share
* Reconfigured everything: network, VLAN, iSCSI, etc.
* == IMPORTED the snapshot on this new engine
* Created an export domain on another NFS share
* Exported the 6 VM’s that I need to export from the storage-level snapshot to 
the export domain
* Detached the export domain from the temporary engine
* Added the export domain on the production engine
* Deleted the compromised VMs
* Imported the “snapshoted" VM’s from the export domain
* == INFRA is back
* Destroyed the new engine, the snapshot iSCSI share and the export domain
* Reinstalled the host
* Added back to the original Datacenter / Cluster.

As you can see was a tiresome work just to get the VM’s back from an storage 
level snapshot of the iSCSI share, but is what I’ve ended up doing.

Lesson learned: it’s too difficult to recover storage-level snapshots, it’s 
hard on NFS and on iSCSI is extremely worse since you can’t mount iSCSI 
whatever you want to.

My opinion: Should be a feature on oVirt to at least allow to mount this kind 
of conflicting volume as readonly for recovery reasons only.

Thanks.


I don’t know how to mount the iSCSI volume to recover the data. The data is 
there but it’s extremely difficult to get it.

Any ideias?

Thanks.


On 3 Mar 2022, at 20:56, Vinícius Ferrão 
mailto:fer...@versatushpc.com.br>> wrote:

I think I’ve found the root cause, and it’s the LVM inside the iSCSI volume:

[root@rhvh5 ~]# pvscan
WARNING: Not using device /dev/mapper/36589cfc00db9cf56949c63d338ef for PV 
fTIrnd-gnz2-dI8i-DesK-vIqs-E1BK-mvxtha.
WARNING: PV fTIrnd-gnz2-dI8i-DesK-vIqs-E1BK-mvxtha prefers device 
/dev/mapper/36589cfc006f6c96763988802912b because device is used by LV.
PV /dev/mapper/36589cfc006f6c96763988802912bVG 
9377d243-2c18-4620-995f-5fc680e7b4f3   lvm2 [<10.00 TiB / 7.83 TiB free]
PV /dev/mapper/36589cfc00a1b985d3908c07e41adVG 
650b0003-7eec-4fa5-85ea-c019f6408248   lvm2 [199.62 GiB / <123.88 GiB free]
PV /dev/mapper/3600605b00805d8a01c2180fd0d8d8dad3   VG rhvh_rhvh5   
  lvm2 [<277.27 GiB / 54.55 GiB free]
Total: 3 [<10.47 TiB] / in use: 3 [<10.47 TiB] / in no VG: 0 [0   ]

The device that’s not being using is the snapshot. There’s a way to change the 
ID of the device so I can import the data domain?

Thanks.

On 3 Mar 2022, at 20:21, Vinícius Ferrão via Users 
mailto:users@ovirt.org>> wrote:

Hello,

I need to import an old snapshot of my Data domain but oVirt does not find the 
snapshot version when importing on the web interface.

To be clear, I’ve mounted a snapshot on my storage, and exported it on iSCSI. I 
was expecting that I could be able to import it on the engine.

On the web interface this Import Pre-Configured Domain finds the relative IQN 
but it does not show up as a target.

Any ideas?


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[ovirt-users] Re: Import an snapshot of an iSCSI Domain

[Nir Soffer]

On Fri, Mar 4, 2022 at 8:28 AM Vinícius Ferrão via Users
 wrote:
>
> Hi again, I don’t know if it will be possible to import the storage domain 
> due to conflicts with the UUID of the LVM devices. I’ve tried to issue a 
> vgimportclone to chance the UUIDs and import the volume but it still does not 
> shows up on oVirt.

LVM can change VG/PV UUIDs and names, but storage domain metadata kept in the
VG tags and volume metadata area contain the old VG and PV names and UUIDs,
so it is unlikely to work.

The system is designed so if the original PVs are bad, you can
disconnect them and
connect a backup of the PVs, and import the storage domain again to the system.

Can you explain in more details what you are trying to do?

Nir

> I don’t know how to mount the iSCSI volume to recover the data. The data is 
> there but it’s extremely difficult to get it.
>
> Any ideias?
>
> Thanks.
>
>
> > On 3 Mar 2022, at 20:56, Vinícius Ferrão  wrote:
> >
> > I think I’ve found the root cause, and it’s the LVM inside the iSCSI volume:
> >
> > [root@rhvh5 ~]# pvscan
> >  WARNING: Not using device /dev/mapper/36589cfc00db9cf56949c63d338ef 
> > for PV fTIrnd-gnz2-dI8i-DesK-vIqs-E1BK-mvxtha.
> >  WARNING: PV fTIrnd-gnz2-dI8i-DesK-vIqs-E1BK-mvxtha prefers device 
> > /dev/mapper/36589cfc006f6c96763988802912b because device is used by LV.
> >  PV /dev/mapper/36589cfc006f6c96763988802912bVG 
> > 9377d243-2c18-4620-995f-5fc680e7b4f3   lvm2 [<10.00 TiB / 7.83 TiB free]
> >  PV /dev/mapper/36589cfc00a1b985d3908c07e41adVG 
> > 650b0003-7eec-4fa5-85ea-c019f6408248   lvm2 [199.62 GiB / <123.88 GiB free]
> >  PV /dev/mapper/3600605b00805d8a01c2180fd0d8d8dad3   VG rhvh_rhvh5  
> >lvm2 [<277.27 GiB / 54.55 GiB free]
> >  Total: 3 [<10.47 TiB] / in use: 3 [<10.47 TiB] / in no VG: 0 [0   ]
> >
> > The device that’s not being using is the snapshot. There’s a way to change 
> > the ID of the device so I can import the data domain?
> >
> > Thanks.
> >
> >> On 3 Mar 2022, at 20:21, Vinícius Ferrão via Users  wrote:
> >>
> >> Hello,
> >>
> >> I need to import an old snapshot of my Data domain but oVirt does not find 
> >> the snapshot version when importing on the web interface.
> >>
> >> To be clear, I’ve mounted a snapshot on my storage, and exported it on 
> >> iSCSI. I was expecting that I could be able to import it on the engine.
> >>
> >> On the web interface this Import Pre-Configured Domain finds the relative 
> >> IQN but it does not show up as a target.
> >>
> >> Any ideas?
> >>
> >>
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> >
>
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[ovirt-users] Re: Import an snapshot of an iSCSI Domain

[Strahil Nikolov via Users]

Are you sureyou don't have lvm filter that ignores the PV ?
Best Regards,Strahil Nikolov
 
 
  On Fri, Mar 4, 2022 at 8:26, Vinícius Ferrão via Users 
wrote:   Hi again, I don’t know if it will be possible to import the storage 
domain due to conflicts with the UUID of the LVM devices. I’ve tried to issue a 
vgimportclone to chance the UUIDs and import the volume but it still does not 
shows up on oVirt.

I don’t know how to mount the iSCSI volume to recover the data. The data is 
there but it’s extremely difficult to get it.

Any ideias?

Thanks.


> On 3 Mar 2022, at 20:56, Vinícius Ferrão  wrote:
> 
> I think I’ve found the root cause, and it’s the LVM inside the iSCSI volume:
> 
> [root@rhvh5 ~]# pvscan 
>  WARNING: Not using device /dev/mapper/36589cfc00db9cf56949c63d338ef for 
>PV fTIrnd-gnz2-dI8i-DesK-vIqs-E1BK-mvxtha.
>  WARNING: PV fTIrnd-gnz2-dI8i-DesK-vIqs-E1BK-mvxtha prefers device 
>/dev/mapper/36589cfc006f6c96763988802912b because device is used by LV.
>  PV /dev/mapper/36589cfc006f6c96763988802912b    VG 
>9377d243-2c18-4620-995f-5fc680e7b4f3  lvm2 [<10.00 TiB / 7.83 TiB free]
>  PV /dev/mapper/36589cfc00a1b985d3908c07e41ad    VG 
>650b0003-7eec-4fa5-85ea-c019f6408248  lvm2 [199.62 GiB / <123.88 GiB free]
>  PV /dev/mapper/3600605b00805d8a01c2180fd0d8d8dad3  VG rhvh_rhvh5             
>               lvm2 [<277.27 GiB / 54.55 GiB free]
>  Total: 3 [<10.47 TiB] / in use: 3 [<10.47 TiB] / in no VG: 0 [0  ]
> 
> The device that’s not being using is the snapshot. There’s a way to change 
> the ID of the device so I can import the data domain?
> 
> Thanks.
> 
>> On 3 Mar 2022, at 20:21, Vinícius Ferrão via Users  wrote:
>> 
>> Hello,
>> 
>> I need to import an old snapshot of my Data domain but oVirt does not find 
>> the snapshot version when importing on the web interface.
>> 
>> To be clear, I’ve mounted a snapshot on my storage, and exported it on 
>> iSCSI. I was expecting that I could be able to import it on the engine.
>> 
>> On the web interface this Import Pre-Configured Domain finds the relative 
>> IQN but it does not show up as a target.
>> 
>> Any ideas?
>> 
>> 
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> 

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[ovirt-users] Re: Import an snapshot of an iSCSI Domain

[Vinícius Ferrão via Users]

Hi again, I don’t know if it will be possible to import the storage domain due 
to conflicts with the UUID of the LVM devices. I’ve tried to issue a 
vgimportclone to chance the UUIDs and import the volume but it still does not 
shows up on oVirt.

I don’t know how to mount the iSCSI volume to recover the data. The data is 
there but it’s extremely difficult to get it.

Any ideias?

Thanks.


> On 3 Mar 2022, at 20:56, Vinícius Ferrão  wrote:
> 
> I think I’ve found the root cause, and it’s the LVM inside the iSCSI volume:
> 
> [root@rhvh5 ~]# pvscan 
>  WARNING: Not using device /dev/mapper/36589cfc00db9cf56949c63d338ef for 
> PV fTIrnd-gnz2-dI8i-DesK-vIqs-E1BK-mvxtha.
>  WARNING: PV fTIrnd-gnz2-dI8i-DesK-vIqs-E1BK-mvxtha prefers device 
> /dev/mapper/36589cfc006f6c96763988802912b because device is used by LV.
>  PV /dev/mapper/36589cfc006f6c96763988802912bVG 
> 9377d243-2c18-4620-995f-5fc680e7b4f3   lvm2 [<10.00 TiB / 7.83 TiB free]
>  PV /dev/mapper/36589cfc00a1b985d3908c07e41adVG 
> 650b0003-7eec-4fa5-85ea-c019f6408248   lvm2 [199.62 GiB / <123.88 GiB free]
>  PV /dev/mapper/3600605b00805d8a01c2180fd0d8d8dad3   VG rhvh_rhvh5
>  lvm2 [<277.27 GiB / 54.55 GiB free]
>  Total: 3 [<10.47 TiB] / in use: 3 [<10.47 TiB] / in no VG: 0 [0   ]
> 
> The device that’s not being using is the snapshot. There’s a way to change 
> the ID of the device so I can import the data domain?
> 
> Thanks.
> 
>> On 3 Mar 2022, at 20:21, Vinícius Ferrão via Users  wrote:
>> 
>> Hello,
>> 
>> I need to import an old snapshot of my Data domain but oVirt does not find 
>> the snapshot version when importing on the web interface.
>> 
>> To be clear, I’ve mounted a snapshot on my storage, and exported it on 
>> iSCSI. I was expecting that I could be able to import it on the engine.
>> 
>> On the web interface this Import Pre-Configured Domain finds the relative 
>> IQN but it does not show up as a target.
>> 
>> Any ideas?
>> 
>> 
>> ___
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> 

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[ovirt-users] Re: Import an snapshot of an iSCSI Domain

[Vinícius Ferrão via Users]

I think I’ve found the root cause, and it’s the LVM inside the iSCSI volume:

[root@rhvh5 ~]# pvscan 
  WARNING: Not using device /dev/mapper/36589cfc00db9cf56949c63d338ef for 
PV fTIrnd-gnz2-dI8i-DesK-vIqs-E1BK-mvxtha.
  WARNING: PV fTIrnd-gnz2-dI8i-DesK-vIqs-E1BK-mvxtha prefers device 
/dev/mapper/36589cfc006f6c96763988802912b because device is used by LV.
  PV /dev/mapper/36589cfc006f6c96763988802912bVG 
9377d243-2c18-4620-995f-5fc680e7b4f3   lvm2 [<10.00 TiB / 7.83 TiB free]
  PV /dev/mapper/36589cfc00a1b985d3908c07e41adVG 
650b0003-7eec-4fa5-85ea-c019f6408248   lvm2 [199.62 GiB / <123.88 GiB free]
  PV /dev/mapper/3600605b00805d8a01c2180fd0d8d8dad3   VG rhvh_rhvh5 
lvm2 [<277.27 GiB / 54.55 GiB free]
  Total: 3 [<10.47 TiB] / in use: 3 [<10.47 TiB] / in no VG: 0 [0   ]

The device that’s not being using is the snapshot. There’s a way to change the 
ID of the device so I can import the data domain?

Thanks.

> On 3 Mar 2022, at 20:21, Vinícius Ferrão via Users  wrote:
> 
> Hello,
> 
> I need to import an old snapshot of my Data domain but oVirt does not find 
> the snapshot version when importing on the web interface.
> 
> To be clear, I’ve mounted a snapshot on my storage, and exported it on iSCSI. 
> I was expecting that I could be able to import it on the engine.
> 
> On the web interface this Import Pre-Configured Domain finds the relative IQN 
> but it does not show up as a target.
> 
> Any ideas?
> 
> 
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