After a network split and recovery in a RHEL 5 or 6 cluster using fence_scsi, one node is killed and the remaining node cannot access storage devices

Solution Unverified - Updated -

Issue

  • In a two node cluster with fence_scsi, if there is a a temporary network split, after recovery only one node remains in the cluster but it cannot access the storage devices
  • After a network issue in a two node cluster, the one remaining node is not registered to the SCSI devices any longer and gets SCSI reservation conflicts
  • It seems that in a two node cluster if network connectivity is lost for a short time, the cluster ends up in an unworkable state.

Environment

  • Red Hat Enterprise Linux (RHEL) 5 or 6 with the High Availability Add On
  • Cluster configured to use fence_scsi
  • Two-node cluster

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