I have a ceph filesystem that I can manually mount on my ovirt host. 

[root@ovirt121 ~]# mount -t ceph ceph01:/ /mnt -o name=admin,secret=<secret removed for security>
[root@ovirt121 ~]# touch /mnt/test

works great!  Then I umount that filesystem and attempt to add storage domain in ovirt engine.  Settings:

Storage type: POSIX compliant FS
Host to use: ovirt121
name: cephdata
Path: ceph01:/
vfs type: ceph
mount options: name=admin,secret=<secret removed for security>

In the oVirt web UI I get a "General Exception" error.  On the host I see this in vdsm.log:

2018-10-03 23:47:58,165+0000 INFO  (jsonrpc/6) [vdsm.api] START connectStorageServer(domType=6, spUUID=u'00000000-0000-0000-0000-000000000000', conList=[{u'mnt_options': u'name=admin,secret=AQDJI7RbS4Z2GhAAhlyWUvX7wtPNzO6n5vqjsQ==', u'id': u'00000000-0000-0000-0000-000000000000', u'connection': u'ceph01:/', u'iqn': u'', u'user': u'', u'tpgt': u'1', u'vfs_type': u'ceph', u'password': '********', u'port': u''}], options=None) from=::ffff:10.78.7.221,54910, flow_id=ba106a2d-e204-4da7-acc7-29b70c3ff759, task_id=b5e0c87c-8838-4b49-8590-11382a02d67f (api:46)
2018-10-03 23:47:58,166+0000 INFO  (jsonrpc/6) [storage.StorageServer.MountConnection] Creating directory u'/rhev/data-center/mnt/ceph01:_' (storageServer:167)
2018-10-03 23:47:58,166+0000 INFO  (jsonrpc/6) [storage.fileUtils] Creating directory: /rhev/data-center/mnt/ceph01:_ mode: None (fileUtils:197)
2018-10-03 23:47:58,166+0000 INFO  (jsonrpc/6) [storage.Mount] mounting ceph01:/ at /rhev/data-center/mnt/ceph01:_ (mount:204)
2018-10-03 23:47:58,218+0000 ERROR (jsonrpc/6) [storage.HSM] Could not connect to storageServer (hsm:2415)
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/vdsm/storage/hsm.py", line 2412, in connectStorageServer
    conObj.connect()
  File "/usr/lib/python2.7/site-packages/vdsm/storage/storageServer.py", line 183, in connect
    self.getMountObj().getRecord().fs_file)
  File "/usr/lib/python2.7/site-packages/vdsm/storage/mount.py", line 253, in getRecord
    (self.fs_spec, self.fs_file))
OSError: [Errno 2] Mount of `ceph01:/` at `/rhev/data-center/mnt/ceph01:_` does not exist
2018-10-03 23:47:58,218+0000 INFO  (jsonrpc/6) [vdsm.api] FINISH connectStorageServer return={'statuslist': [{'status': 100, 'id': u'00000000-0000-0000-0000-000000000000'}]} from=::ffff:10.78.7.221,54910, flow_id=ba106a2d-e204-4da7-acc7-29b70c3ff759, task_id=b5e0c87c-8838-4b49-8590-11382a02d67f (api:52)

However, if i run "monut" or "cat /proc/mounts" I can see the cephfs was properly mounted, I can even touch files.

[root@ovirt121 ~]# touch /rhev/data-center/mnt/ceph01\:_/ceph_ovirt_test
[root@ovirt121 ~]#


[root@ovirt121 ~]# cat /proc/mounts
<...bunch of mounts...>
10.78.71.1:/ /rhev/data-center/mnt/ceph01:_ ceph rw,relatime,name=admin,secret=<hidden>,acl,wsize=16777216 0 0
[root@ovirt121 ~]#

Any thoughts?

oVirt version is 4.2.6.4-1.el7, running on CentOS 7 18.05.
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