TMS zl Management and Configuration Guide ST.1.1.100430

8-21

High Availability

Updating Cluster Software

Caution This operation will cause you to lose network connectivity for 15–30 minutes;

therefore, you should plan these software updates for a low network-utiliza-

tion time.

When updating software on an HA cluster, keep the following in mind:

■ You cannot update the software on cluster participants by synchronizing

them with an updated master because both of the modules in a cluster

must be running the same software version when the cluster in formed.

■ The Synchronize Now command will not copy the new software image to

the participant. Instead, you must update each module separately.

■ You can download and install the new software image at one time and

then later reboot the module to complete the installation.

When updating the software, you will complete the following steps:

1. Back up the master’s startup configuration.

2. Remove the participant from the cluster (using the no high-availability

command with the delete-cluster-data option).

3. Update the master’s software.

4. Update the participant’s software.

5. Rejoin the participant to the cluster.

Note It is essential that you complete the steps in the order listed and include the

delete-cluster-data option when removing the participant from the cluster. If

you do not, you may inadvertently create problems with the HA cluster. For

example, if you do not include the delete-cluster-data option when removing

the participant, both HA members will retain the cluster’s IP settings, creating

an address conflict on your network. If you boot the participant first (after

updating its software), it will become the cluster master. If you used the delete-

cluster-data option when removing the participant and then boot it first, the

master’s startup-config will be erased when it joins the cluster.

Back up the Master’s Startup Configuration

In this step you will save a backup copy of the master’s startup-config. This

way, in the event that your master loses it’s configuration, you can restore to

the saved configuration.