TMS zl Management and Configuration Guide ST.1.0.090213

8-12

High Availability

Updating Cluster Software

Warning 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.

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 follow the steps in the order listed. If you do not, you

may accidentally erase your startup-config, or the wrong module may become

the cluster master.

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.

The instructions below tell you how to update the software on an HA cluster

using primarily the Web browser interface. However, some of the steps require

that you use the CLI.

1. On the cluster master, select System > Maintenance.