[ovirt-users] Importing gluster SD from geo-replicated volume

[Ivan Bulatovic]

Hi, I have two DC's (both initialized), two-node each, and on the first 
one I have a replica 2 gluster storage domain that is geo-replicating on 
a replica 2 slave volume on the second DC (managed within the same 
engine). When I stop the replication (volumes are synced) and try to 
import the gluster storage domain that resides on the slave, import 
storage domain dialog throws a general exception.

Exception is raised when vdsm loads the list of backup servers so that 
the backup-volfile-servers mount option could get populated. If I 
override that in storageServer.py, so that it always return blank, or 
when I manually enter this option in the import storage domain dialog, 
then everything works as expected.

Maybe it's worth mentioning that I have a dedicated gluster network and 
hostnames for all nodes in both DC's (node hostname, and hostname I use 
for gluster on that node are different), and that all attempts to import 
a storage domain were on the second DC.

Btw, setting up gluster geo-replication from oVirt was a breeze, easy 
and straightforward. Importing domain based on slave gluster volume 
works when gluster storage domain that resides on master volume gets 
removed from the first DC. This is something that we could improve, if I 
don't detach and remove original gluster sd, import storage dialog just 
shows up again after a short "running circle", but it should provide a 
warning that there is another storage domain already active/registered 
in the engine with the same ID/name and that the domain should be 
removed (or the engine can do it for us). I get this warning only when 
I've already removed storage domain on a master volume from the first DC 
(which doesn't make sense to me).

I can open bug reports for both issues if needed, just want to check if 
the rationale behind the process is correct or not.

vdsm-gluster-4.17.10.1-0.el7
ovirt-engine-webadmin-portal-3.6.1-0.0.master.20151117185807.git529d3d2.el7

engine.log

2015-11-19 07:33:15,245 ERROR 
[org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] 
(default task-23) [34886be8] Correlation ID: null, Call Stack: null, 
Custom Event ID: -1, Message: The error message for connection 
hostname:/volname returned by VDSM was: General Exception
2015-11-19 07:33:15,245 ERROR 
[org.ovirt.engine.core.bll.storage.BaseFsStorageHelper] (default 
task-23) [34886be8] The connection with details 'hostname:/volname' 
failed because of error code '100' and error message is: general exception

vdsm.log

Thread-38::ERROR::2015-11-19 
07:33:15,237::hsm::2465::Storage.HSM::(connectStorageServer) Could not 
connect to storageServer
Traceback (most recent call last):
   File "/usr/share/vdsm/storage/hsm.py", line 2462, in connectStorageServer
     conObj.connect()
   File "/usr/share/vdsm/storage/storageServer.py", line 224, in connect
     self._mount.mount(self.options, self._vfsType, cgroup=self.CGROUP)
   File "/usr/share/vdsm/storage/storageServer.py", line 324, in options
     backup_servers_option = self._get_backup_servers_option()
   File "/usr/share/vdsm/storage/storageServer.py", line 341, in 
_get_backup_servers_option
     servers.remove(self._volfileserver)
ValueError: list.remove(x): x not in list