How to upgrade an High Availability Cluster

2 Log in to AMC on the Active node and then, from the main navigation menu in AMC, click Maintenance.
3 In the System software updates area, click Update.
4 If you have not already downloaded the update file (as described in the Obtaining the Update File or Hotfix from MySonicWall section), log in into your MysonicWALL.com, and download the appropriate update or hotfix file to your local file system.
5 Click Browse to locate the update or hotfix file or type the file path.
6 Click Install Update.
7 While node 1 is updating, the Standby node (node 2) continues servicing requests. When the update to node 1 completes and node 1 comes back online, it notices that the node 2 version differs from its own. It then stops the services on node 2 and services all incoming requests itself.

8 Log in in node 2 and follow the same steps to upgrade node2

When the update to node 2 completes and node 2 comes back online, it rejoins the cluster and is synchronized with node 1. The cluster is then aware that both nodes are available to service requests.

9 Make sure the update succeeded by verifying in AMC on both nodes that the Version number is 11.4.x- where x- is the current maintenance release version and threedigit build number. For example, if you update the system with upgrade 11.4.0-258.bin, the version in AMC is reported as 11.4.0-258. Hotfixes do not modify the AMC reported version. For hotfix information, click the hotfixes link next to the version number.