[ovirt-users] Problem with Adding Pre-Configured Domain

[Roger Meier]

Hi Ivan,

The problem is their is no warning in the webUI. I can press the button
and nothing happens (i only see the error message in the logfile) no
error, i stuck in the config UI.

I tried now another approach based on your idea. I turned the master
storage domain into maintenance mode and changed the nfs path and
activated it again with the new share path. After this ovirt used the
slave storage and i can start the VM's of the snapshot and read/write on
it. After the test i switched back with modify the nfs path and started
the VM on the master storage without problem. This works if master 
storage is completly lost and i must switch complete to the slave storage.

The only problem now is for the use case if only one VM had a problem
and I only need the snapshot data which is on the slave storage. I read
your link, and this can perhaps be that what i need, but at the moment
it looks like
a feature that is on status implementation since october last year.
Perhaps it works when i add a new VM on the data storage which create's
empty disk images (or use the existing broken VM) and after that i copy
the disk images from the slave storage over the empty disk images. But
this woul'd be in the console and fault-prone.  An way to import
snaps/replicated storage domains would be realy cool.

Greetings
Roger

On 24.11.2015 20:32, Ivan Bulatovic wrote:
> Hi Roger,
>
> you can not import the snapshot because you already have an active
> storage domain that contains the same (meta)data. Try detaching the
> storage domain that you take snapshots from, and remove it (do not
> select to wipe the data), and then try to import the snapshot. You
> will see a warning that the domain is already registered within ovirt
> engine and you can force the import to continue. After that, you
> should see the domain registered in ovirt webadmin. Before detaching
> the domain, make sure you have another domain active so it can become
> a master domain, and create exports of the VM's that are part of that
> domain just in case.
>
> I had the same problem while trying to import a replicated storage
> domain, you can see that oVirt tries to import the domain, but it just
> returns to import domain dialog. It actually mounts the domain for a
> few seconds, then disconnects and removes the mount point under
> /rhev/data-center/ and then it tries to unmount it and fails because
> mount point doesn't exist anymore.
>
> Mentioned it here recently:
> http://lists.ovirt.org/pipermail/users/2015-November/036027.html
>
> Maybe there is a workaround for importing the clone/snap of the domain
> while the source is still active (messing with the metadata), but I
> haven't tried it so far (there are several implications that needs to
> be taken into the account). However, I'm also interested if there is a
> way to do such a thing, especially when you have two separate
> datacenters registered within the same engine, and it would be great
> for us to be able to import snaps/replicated storage domains and/or
> VM's that reside on it while still having the original VM's active and
> running.
>
> Something similar to the third RFE here (this is only for VM's):
> http://www.ovirt.org/Features/ImportUnregisteredEntities#RFEs
>
> In any case, I'll try this ASAP, always an interesting topic. Any
> insights on this is highly appreciated.
>
> Ivan
>
> On 11/24/2015 12:40 PM, Roger Meier wrote:
>> Hi All,
>>
>> I don't know if this is a Bug or an error on my side.
>>
>> At the moment,  i have a oVirt 3.6 installation with two Nodes and
>> Two Storage Server, which
>> are configured themselfs als master/slave (solaris zfs snapshot copy
>> from master to slave all 2 hours)
>>
>> Now i try to do some tests for some failure use cases like, master
>> storage isn't available anymore or
>> one of the virtual machines must be restored from the snapshot.
>>
>> Because the data n the slave is a snapshot copy, all data which are
>> on the Data Domain NFS Storage,
>> are also on the slave NFS Storage.
>>
>> I tried it to add over WebUI over the option "Import Domain" (Import
>> Pre-Configured Domain) with both
>> Domain Functions (Data and Export) but nothing happens, expect some
>> errors in the vdsm.log Logfile.
>>
>> Something like this
>>
>> Thread-253746::ERROR::2015-11-24
>> 11:44:41,758::hsm::2549::Storage.HSM::(disconnectStorageServer) Could
>> not disconnect from storageServer
>> Traceback (most recent call last):
>>   File "/usr/share/vdsm/storage/hsm.py", line 2545, in
>> disconnectStorageServer
>>     conObj.disconnect()
>>   File "/usr/share/vdsm/storage/storageServer.py", line 425, in
>> disconnect
>>     return self._mountCon.disconnect()
>>   File "/usr/share/vdsm/storage/storageServer.py", line 254, in
>> disconnect
>>     self._mount.umount(True, True)
>>   File "/usr/share/vdsm/storage/mount.py", line 256, in umount
>>     return self._runcmd(cmd, timeout)
>>   File "/usr/share/vdsm/storage/mount.py", line 241, in _runcmd
>>     raise MountError(rc, ";".join((out, err)))
>> MountError: (32, ';umount:
>> /rhev/data-center/mnt/192.168.1.13:_oi-srv2-sasData1_oi-srv1-sasData1_nfsshare1:
>> mountpoint not found\n')
>>
>> I checked with nfs-check.py if all permissions are ok, the tool say
>> this:
>>
>> Konsole output
>> [root at lin-ovirt1 contrib]# python ./nfs-check.py
>> 192.168.1.13:/oi-srv2-sasData1/oi-srv1-sasData1/nfsshare1
>> Current hostname: lin-ovirt1 - IP addr 192.168.1.14
>> Trying to /bin/mount -t nfs
>> 192.168.1.13:/oi-srv2-sasData1/oi-srv1-sasData1/nfsshare1...
>> Executing NFS tests..
>> Removing vdsmTest file..
>> Status of tests [OK]
>> Disconnecting from NFS Server..
>> Done!
>>
>> Greetings
>> Roger Meier
>>
>>
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