After configuring HA, the administrator runs cmsh status and notices the secondary head node reports mysql [FAIL]. What is the most likely cause?

In a Bright Cluster Manager (BCM) High Availability (HA) configuration, the MySQL database, which contains critical cluster configuration, relies on DRBD for block-level replication between the active and passive head nodes. The MySQL service resource is managed by the HA software (Pacemaker). A mysql [FAIL] status on the secondary (passive) node typically indicates a problem with the underlying storage resource. If the DRBD volume containing the MySQL data is not properly synchronized or is in a "Split-Brain" state, the HA cluster manager will report the dependent MySQL resource as failed on that node to prevent data corruption.

A) The BCM HA setup process ensures all necessary packages, including MySQL, are installed and configured on both head nodes.

C) A firewall issue on the active node would affect client connectivity but would not cause the HA resource to be marked as failed on the passive node.

D) The MySQL service is intentionally stopped on the passive node during normal operation, so memory usage for the service itself is not a factor.

1. Bright Cluster Manager Administrator Manual. (Version 9.2). Section 6.9 "Troubleshooting Head Node Failover". This section explains the relationship between services and DRBD, stating, "The failover of services depends on the state of the DRBD devices... If a DRBD device is not in a good state, then services that depend on it cannot be started." This directly links service failure to DRBD state.

2. DRBD User's Guide. (Version 9.0). Section 5.3 "Split Brain". The guide details how split brain scenarios prevent data synchronization and require manual intervention, which would cause a dependent service managed by a cluster resource manager to fail its health check.