A fence_sbd stonith device floods the logs with "Doing flush + writing 'b' to sysrq on timeout" in a Pacemaker cluster

Solution In Progress - Updated -

Issue

  • Messages like the following appear frequently in /var/log/messages on a node where a fence_sbd stonith device is in Started state.
Jan 20 16:51:58 fastvm-rhel-7-6-21 sbd[24627]:  notice: main: Doing flush + writing 'b' to sysrq on timeout
Jan 20 16:51:58 fastvm-rhel-7-6-21 sbd[24638]:  notice: main: Doing flush + writing 'b' to sysrq on timeout
Jan 20 16:51:58 fastvm-rhel-7-6-21 sbd[24641]:  notice: main: Doing flush + writing 'b' to sysrq on timeout

Environment

  • Red Hat Enterprise Linux 7 (with the High Availability Add-on)
  • Red Hat Enterprise Linux 8 (with the High Availability Add-on)

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