Best practices for enabling multicast traffic for Red Hat Cluster Suite on Cisco Catalyst switches
Issue
- Nodes do not receive traffic being sent by other cluster members during bootup, which may result in a non-quorate cluster or a split brain scenario
- There is a delay before network requests for nodes can be serviced.
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Each node shows itself as online and the other(s) as offline.
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Nodes are fenced during bootup.
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Nodes are only able to form a cluster when
CMANis started manually, but not when started as part of the boot process. -
Only one node is able to bring its cluster services online, while other nodes print messages similar to:
openais[1234]: [CMAN ] cman killed by node 1 because we rejoined the cluster without a full restart
Environment
- Red Hat Cluster Suite 4+
- Red Hat Enterprise Linux Server 5 (with the High Availability and Resilient Storage Add Ons)
- Red Hat Enterprise Linux Server 6 (with the High Availability and Resilient Storage Add Ons)
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