we have a strange behavior within an oVirt cluster. Version is 3.5.1, engine is running on EL6 machine and hosts are using EL7 as operating system. The cluster uses a GlusterFS backed storage domain amongst others. Three of four hosts are peers in the Gluster cluster (3 bricks, 3 replica).

When all hosts are restarted (maybe due to power outage), engine can't activate them again, because Gluster probe fails. The message given in UI is:

"Gluster command [gluster peer node-03] failed on server node-03."

Checking Gluster peer and volume status on each host confirms that Gluster peers are known to each other and volume is up.

node-03:~ $ gluster peer status
Number of Peers: 2

Hostname: node-02
Uuid: 3fc36f55-d3a2-4efc-b2f0-31f83ed709d9
State: Peer in Cluster (Connected)

Hostname: node-01
Uuid: 18027b35-971b-4b21-bb3d-df252b4dd525
State: Peer in Cluster (Connected)

node-03:~ $ gluster volume status
Status of volume: glusterfs-1
Gluster process                                 Port    Online  Pid
Brick node-01:/export/glusterfs/brick           49152   Y       12409
Brick node-02:/export/glusterfs/brick           49153   Y       9978
Brick node-03:/export/glusterfs/brick           49152   Y       10001
Self-heal Daemon on localhost                   N/A     Y       10003
Self-heal Daemon on node-01                     N/A     Y       11590
Self-heal Daemon on node-02                     N/A     Y       9988

Task Status of Volume glusterfs-1
There are no active volume tasks

Storage domain in oVirt UI is fine (active and green) and usable. But neither Gluster volume nor any brick is visible in UI.

If I try the command which is shown in UI it returns:

root@node-03:~ $ gluster peer probe node-03
peer probe: success. Probe on localhost not needed

root@node-03:~ $ gluster --mode=script peer probe node-03 --xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
  <output>Probe on localhost not needed</output>

Is this maybe just an engine side parsing error?

Kind regards

Jan Siml
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