1+1 High Availability clusters can provide continuous access to services during upgrades, when you upgrade one server at a time. You can do this by first upgrading the standby server. After activating the upgraded standby server, then you upgrade the other server.
Procedure
Navigate to EM > Element Status on each server and determine which server has High Availability State of Standby.
To lock the state on the active server, navigate to EM > Cluster Configuration > High Availability and select the Local High Availability State Lock checkbox.
Click Save.
Click Confirm.
To upgrade the standby server, go to Step 6 of the automatic or manual upgrade procedure.
Wait for any alarms to clear as the server returns to service and synchronizes the active sessions with the other server.
To unlock the state on the active server, navigate to EM > Cluster Configuration > High Availability and clear the Local High Availability State Lock checkbox.
Click Save.
Click Confirm.
To put the active server in standby, navigate to EM > Element Status and select Failover from the More Actions drop-down menu.
Click Confirm.
The active server is now the standby server.
To lock the state on the active server, navigate to EM > Cluster Configuration > High Availability and select the Local High Availability State Lock checkbox.
Click Save.
Click Confirm.
To upgrade the standby server, go to Step 6 of the automatic or manual upgrade procedure.
Wait for any alarms to clear as the server returns to service and synchronizes the active sessions with the other server.
To unlock the state on the active server, navigate to EM > Cluster Configuration > High Availability and clear the Local High Availability State Lock checkbox.
