Clustered Red Hat Enterprise Linux 5 servers had to be rebooted after dlm_send process hit 100% usage

Solution Verified - Updated -

Issue

In a clustered Red Hat Enterprise Linux 5 environment, disk I/O has been steadily increasing over 8 days or so, culminating in extremely high load and disk I/O contention. After attempting to remove node 1 from the cluster, the dlm_send process on the node started consuming 100% CPU, and required a reboot of the machine to rectify.

Environment

  • Red Hat Enterprise Linux 5
  • GFS2

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