17.2.1 Prerequisite software program
Cold standby configurations require HA Monitor.
HADB uses HA Monitor's monitor mode function to monitor failures in the active system. If a failure occurs in the active system, HA Monitor's hot standby function switches operation to the standby system.
For details on the host switching that takes place in the event of a failure, see 17.12 Operations when a failure occurs.
Note that depending on the version of Linux you are using, the prerequisite version of HA Monitor differs as follows:
-
Red Hat Enterprise Linux Server 6 (64-bit x86_64): 01-56-01 or later
-
Red Hat Enterprise Linux Server 7 (64-bit x86_64): 01-61 or later