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Unable to Remove a Server From the ServerPool Using EMC PowerPath : catch_error: /dev/emcpowerX already mounted on /poolfsmnt/YYYYYY (Doc ID 2395957.1)

Last updated on AUGUST 04, 2018

Applies to:

Oracle VM - Version 3 and later
Linux x86-64
EMC Powerpath is in use and DM multipath is disabled.

Symptoms

Removing a server from the pool fails with:
Error : [2017-10-13 13:20:48 5212] ERROR (service:97) catch_error: /dev/emcpowerc already mounted on /poolfsmnt/0004fb000005000094979add784e5a5f

The servers /var/log/pvs-agent.log contains the  following kind of messages:

2018-01-16 16:50:14 4742] DEBUG (service:75) call start: deconfigure_server_for_cluster('0004fb000005000092ff73832a06fb2a',)
[2018-01-16 16:50:14 4742] DEBUG (ocfs2:267) Trying to umount /dev/mapper/36000144000000010f0051491eb3a77c6
[2018-01-16 16:50:14 4742] DEBUG (ocfs2:279) /dev/mapper/36000144000000010f0051491eb3a77c6 not mounted, skip umounting
[2018-01-16 16:50:14 4742] DEBUG (ocfs2:162) cluster debug: {'/sys/kernel/debug/o2dlm': ['ovm', '0004FB000005000092FF73832A06FB2A'], '/sys/kernel/debug/o2net': ['connected_nodes', 'stats', 'sock_containers', 'send_tracking'], '/sys/kernel/debug/o2hb': ['0004FB000005000092FF73832A06FB2A', 'failed_regions', 'quorum_regions', 'live_regions', 'livenodes'], '/sys/kernel/debug/ocfs2': ['0004FB000005000092FF73832A06FB2A'], 'service o2cb status': 'Driver for "configfs": Loaded\nFilesystem "configfs": Mounted\nStack glue driver: Loaded\nStack plugin "o2cb": Loaded\nDriver for "ocfs2_dlmfs": Loaded\nFilesystem "ocfs2_dlmfs": Mounted\nChecking O2CB cluster "3195ad683a7cff46": Online\n Heartbeat dead threshold: 61\n Network idle timeout: 60000\n Network keepalive delay: 2000\n Network reconnect delay: 2000\n Heartbeat mode: Global\nChecking O2CB heartbeat: Active\n 0004FB000005000092FF73832A06FB2A /dev/emcpowera\nNodes in O2CB cluster: 0 1 \nActive userdlm domains: ovm\nDebug file system at /sys/kernel/debug: mounted\n'}
[2018-01-16 16:50:16 4742] DEBUG (ocfs2:238) Trying to mount /dev/mapper/36000144000000010f0051491eb3a77c6 to /poolfsmnt/0004fb000005000092ff73832a06fb2a
[2018-01-16 16:50:16 4742] ERROR (service:97) catch_error: /dev/emcpowera already mounted on /poolfsmnt/0004fb000005000092ff73832a06fb2a
Traceback (most recent call last):
File "/usr/lib64/python2.6/site-packages/agent/lib/service.py", line 95, in wrapper
return func(*args)
File "/usr/lib64/python2.6/site-packages/agent/api/cluster/o2cb.py", line 259, in deconfigure_server_for_cluster
mount_device(poolfs_device, poolfs_mount_point)
File "/usr/lib64/python2.6/site-packages/agent/lib/ocfs2.py", line 254, in mount_device
raise Exception("%s already mounted on %s" % (dev, mnt))
Exception: /dev/emcpowera already mounted on /poolfsmnt/0004fb000005000092ff73832a06fb2a



Changes

 Trying to remove a server from the serverpool.

Cause

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