Last updated on JUNE 27, 2009
Applies to:Linux Kernel - Version: 1.0.0-1 to 1.2.9-1
The OCFS2 subsystem refuses to start; or you can start one node but starting the other nodes brings down running nodes; or you see slow OCFS2 performance.
What is wrong?
The connection between each cluster node and the external storage, including any intranet fabric, switches, cabling, adapter cards, and firewalls, all contribute to the disk heartbeat selection. In particular, the number of alternate paths between the cluster node and the external storage must be a prime consideration in the choice of a disk heartbeat timeout.
Similarly, the topology of the cluster private network that carries the network heartbeat traffic must also be considered. Using bonded Ethernet devices is a frequently overlooked source of network heartbeat latency.
Each node in an OCFS2 cluster must use exactly the same timeout settings. The /etc/sysconfig/o2cb file must be identical on each node. Using the ocfs2console tool to manage these settings ensures a consistent setup, cluster-wide.
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