16.2.1 Prerequisite software program
Use of the multi-node function requires HA Monitor.
HADB uses the HA Monitor's monitor mode function to monitor node failures. If a failure occurs in the master node, the HA Monitor function is used to switch over one of the slave nodes to the master node, in order to allow operations to continue. If a node failure occurs for a slave node, the HA Monitor function is used to separate the slave node in which the problem occurred from the multi-node configuration in order to allow operations to continue by using the remaining nodes.
For details on the separation of a slave node in the event of a node failure, see 16.15 Operations when a node failure occurs.
Note that depending on the version of Linux you are using, the prerequisite version of HA Monitor differs as follows:
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Red Hat Enterprise Linux Server 6 (64-bit x86_64): 01-56-01 or later
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Red Hat Enterprise Linux Server 7 (64-bit x86_64): 01-61 or later
- Important
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Make sure the version of HA Monitor is the same on all nodes.