Unable to start Virtual Machine on an Oracle VM server with OVMRU_005007E "Virtual Machine XX cannot be started/resumed on Server: XX. Reasons: - The cluster on Server: XX, is DOWN." after a SAN outage (Doc ID 2098818.1)

Last updated on APRIL 16, 2024

Applies to:

Symptoms

 On Oracle VM, when making use of iscsi, after an outage on a storage which is hosting the pool filesystem of the Server pool for a given server, even if the Storage server is now up with the following kind of error message :

OVMRU_005007E Virtual Machine: LowPri, cannot be started/resumed on Server: dell-ppr1. Reasons: - The cluster on Server: dell-ppr1, is DOWN. . [Thu Jan 21 13:11:10 CET 2016]

In the VM Manager GUI, there is an exclamation mark next to the server's name:

When attempting to display the status of the o2cb service, it shows as offline :

[# service o2cb status
Driver for "configfs": Loaded
Filesystem "configfs": Mounted
Stack glue driver: Loaded
Stack plugin "o2cb": Loaded
Driver for "ocfs2_dlmfs": Loaded
Filesystem "ocfs2_dlmfs": Mounted
Checking O2CB cluster "7065b37c7521e060": Offline
Debug file system at /sys/kernel/debug: mounted

When attempting to start the o2cb service, it fails with the following kind of error message :

[root@dell-ppr1 ~]# service o2cb start
checking debugfs...
Setting cluster stack "o2cb": OK
Registering O2CB cluster "7065b37c7521e060": OK
Setting O2CB cluster timeouts : OK
Starting global heartbeat for cluster "7065b37c7521e060": Failed
o2cb: Heartbeat region could not be found 0004FB0000050000D1D733CD98F00AF7
Stopping global heartbeat on cluster "7065b37c7521e060": OK

The following command reports no open iscsi sesssions whereas there should be some open towards the storage :

# iscsiadm -m session
iscsiadm: No active sessions.

Changes

 Changes in configuration or outage on the storage server.

Cause

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