[ovirt-users] Error mounting hosted engine Volume (Glusterfs) via VDSM

[Ralf Schenk]

Hello,

I think options for mounting the hosted-engine Volume changed in latest
vdsm to support mounting from backup-volfile-servers.

[root at microcloud28 ~]# rpm -qi vdsm
Name        : vdsm
Version     : 4.17.28
Release     : 1.el7
Architecture: noarch
Install Date: Fri 10 Jun 2016 11:17:37 AM CEST
Group       : Applications/System
Size        : 3828639
License     : GPLv2+
Signature   : RSA/SHA1, Fri 03 Jun 2016 12:53:20 AM CEST, Key ID
7aebbe8261e8806c
Source RPM  : vdsm-4.17.28-1.el7.src.rpm

Now my hosts have problems to mount the Volume. On hosted-engine setup I
configured the (Replica 3) volume to be
"glusterfs.rxmgmt.databay.de:/engine" which ist a Round-Robin DNS to my
gluster hosts and _not_ the DNS-Name of any gluster-brick.

Now VDSM logs:

jsonrpc.Executor/3::DEBUG::2016-06-25
19:40:02,520::fileUtils::143::Storage.fileUtils::(createdir) Cre
ating directory:
/rhev/data-center/mnt/glusterSD/glusterfs.rxmgmt.databay.de:_engine
mode: None
jsonrpc.Executor/3::DEBUG::2016-06-25
19:40:02,520::storageServer::364::Storage.StorageServer.MountCon
nection::(_get_backup_servers_option) Using bricks:
['microcloud21.rxmgmt.databay.de', 'microcloud24.r
xmgmt.databay.de', 'microcloud27.rxmgmt.databay.de']
jsonrpc.Executor/3::WARNING::2016-06-25
19:40:02,520::storageServer::370::Storage.StorageServer.MountC
onnection::(_get_backup_servers_option) gluster server
u'glusterfs.rxmgmt.databay.de' is not in bricks
 ['microcloud21.rxmgmt.databay.de', 'microcloud24.rxmgmt.databay.de',
'microcloud27.rxmgmt.databay.de'
], possibly mounting duplicate servers
jsonrpc.Executor/3::DEBUG::2016-06-25
19:40:02,520::mount::229::Storage.Misc.excCmd::(_runcmd) /usr/bi
n/taskset --cpu-list 0-7 /usr/bin/sudo -n /usr/bin/systemd-run --scope
--slice=vdsm-glusterfs /usr/bin
/mount -o
backup-volfile-servers=microcloud21.rxmgmt.databay.de:microcloud24.rxmgmt.databay.de:microcl
oud27.rxmgmt.databay.de glusterfs.rxmgmt.databay.de:/engine
/rhev/data-center/mnt/glusterSD/glusterfs.
rxmgmt.databay.de:_engine (cwd None)
jsonrpc.Executor/3::ERROR::2016-06-25
19:40:02,540::hsm::2473::Storage.HSM::(connectStorageServer) Cou
ld not connect to storageServer
Traceback (most recent call last):
  File "/usr/share/vdsm/storage/hsm.py", line 2470, in connectStorageServer
    conObj.connect()
  File "/usr/share/vdsm/storage/storageServer.py", line 237, in connect
    six.reraise(t, v, tb)
  File "/usr/share/vdsm/storage/storageServer.py", line 229, in connect
    self._mount.mount(self.options, self._vfsType, cgroup=self.CGROUP)
  File "/usr/share/vdsm/storage/mount.py", line 225, in mount
    return self._runcmd(cmd, timeout)
  File "/usr/share/vdsm/storage/mount.py", line 241, in _runcmd
    raise MountError(rc, ";".join((out, err)))
MountError: (32, ';Running scope as unit run-13461.scope.\nmount.nfs: an
incorrect mount option was specified\n')

So the mount is tried as NFS which hasn't the option "-o
backup-volfile-servers=...".

As a consequence the host is disabled in engine. The only way to get it
up is mounting the volume manually to
/rhev/data-center/mnt/glusterSD/glusterfs.
rxmgmt.databay.de:_engine and activate it manually in Management-GUI.

Should and can I change the hosted_storage entry-point globally to i.e.
"microcloud21.rxmgmt.databay.de" or wouldn't it be better globally that
VDSM uses "-t glusterfs" to try to mount the gluster-Volume regardless
which DNS Name for the gluster-service is used ?

Ovirt is:

ovirt-release36.noarch                             1:3.6.6-1

Bye
-- 


*Ralf Schenk*
fon +49 (0) 24 05 / 40 83 70
fax +49 (0) 24 05 / 40 83 759
mail *rs at databay.de* <mailto:rs at databay.de>
	  	
*Databay AG*
Jens-Otto-Krag-Straße 11
D-52146 Würselen
*www.databay.de* <http://www.databay.de>

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Vorstand: Ralf Schenk, Dipl.-Ing. Jens Conze, Aresch Yavari, Dipl.-Kfm.
Philipp Hermanns
Aufsichtsratsvorsitzender: Klaus Scholzen (RA)

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