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Chapter 7 Failover for Database Replication
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7.2 HMXCC1 Master-Slave Database Replication Failover
As there is single HMXCC1 controller unit operating in the system, the administrator must regularly backup the setting data and
logs of this controller unit to the computer manually. Once this single controller unit failed or became offline, the administrator
can restore the latest backup files back to a new controller unit to replace the failed controller unit manually.
While there are one HMXCC1 master unit and one HMXCC1 slave unit operating in parallel in the system, the slave unit will
regularly poll the master unit and replicate setting data and logs from the master unit. Once the slave unit is not responded by
the master unit or the master unit no longer receives the polling from the slave unit, it would be determined as controller
failure or offline events. The controller unit which is still in normal operation will send out a notification to the email address set
by the user. The email letter will notify the administrator the failure event of the master unit or the slave unit.
The user can enable the Failover function by checking it in the database replication setting of the slave unit. As the HMXCC1
master unit fails, the salve unit will automatically replace the failed master unit and serve in the role of new master unit. The
administrator will later remove the failed master unit and add a new slave unit manually.
Either manually or automatically to remove the failure, the system can resume normal operation quickly.
7.2.1 HMXCC1 Database Replication Failover not Enabled (Manual Recovery Mode)
In <Replication> menu，please refer to the following examples to replace the failed master or slave units.
(1) Single controller system operates without controller slave unit
As the single controller unit operates normally, the administrator needs to regularly backup the setting data and log to the PC
from the single controller unit manually. Once the controller fails, the administrator will restore the backup files back to a new
controller unit after he is reported the system failure event. The administrator will remove the failed controller unit then put
the mew controller unit back to the same network environment as the failed master unit. After the new controller reboots
successfully, the system will resume operation again.
Figure 7-14
HMXCC1-G2 User's Manual
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