What does the messages mean: corosync [CPG ] got mcast request?
Environment
- Red Hat Enterprise Linux Server 6 (with the High Availability Add on)
Issue
- What do the messages in the
/var/log/cluster/corosync.logmean when debugging is enabled?
Oct 22 11:28:10 corosync [CPG ] got mcast request on 0x22180f0
Resolution
If debugging is enabled on a Red Hat Enterprise Linux Server 6 (with the High Availability Add on) then messages like the following will be written to the log /var/log/cluster/corosync.log:
Oct 22 11:28:10 corosync [CPG ] got mcast request on 0x22180f0
These messages are saying that a request to send a multicast message has come from some application. All cluster nodes will send slightly different number of messages. This means some cluster nodes will have more of these messages than others. The number of messages only indicates the work being done by a cluster node. For instance if one cluster node is the primary doing all the work then it would have more messages than a cluster node that is the backup.
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