In a split-brain scenario, this command enables the automatic shutdown of the cluster engine on the other node, after the cluster resource manager determines which node has quorum and selects the primary node. This feature is disabled by default.
A split-brain condition occurs when a failure in the HA interface causes communication and data synchronization to stop. The secondary node cannot determine whether the primary node crashed or whether the primary node is healthy, because the communication link is broken and there is no heartbeat. The secondary node attempts to take over the primary role. If the primary node is in fact healthy, the two nodes are now operating independently instead of as a cluster pair.
To resolve the split-brain condition, the cluster resource manager determines which node should be primary. If both nodes are configured and have connected appliances, the node with the majority of connected appliances is selected as the primary node. If the two nodes have the same number of connected appliances, a string comparison function compares the hostnames of the nodes and breaks the tie.
After the primary node is selected, if automatic shutdown is enabled, the other node's cluster engine is stopped. If automatic shutdown is disabled, the other node's cluster engine continues to run.
Note
This is a local configuration. It is performed from each node, and is applied to only that node.
Syntax
[no] ha engine split-brain shutdown auto
Parameters
no
Disables automatic shutdown of the cluster engine.
Example
The following example enables automatic shutdown on node2.
node2 (config) # ha engine split-brain shutdown auto
User role
Admin
Command mode
Config
Supported appliances
This command is supported on the following appliances running the specified releases or later:
Central Management System: Before Release 6.4.0
Note
For more information about Central Management System HA, see the Central Management System High Availability Guide.