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

[Ivan Bulatovic]

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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