About NetBackup Appliance upgrades
When a software update release is available, Cohesity recommends that you install the update in a timely manner to ensure that you have the latest product features and fixes. Cohesity also recommends that you install the latest firmware with the appliance firmware update tool to avoid problems with or immediately after the upgrade.
When you upgrade appliance software, the update release may install an updated version of the operating system, NetBackup, and all appliance interfaces. All services are shut down automatically when the upgrade begins, and then restarted automatically after all updates have been applied.
Cohesity recommends that you plan your appliance upgrades in advance to help minimize system down time and that you use the upgrade automation feature in System Health Insights. For details, see the "Appliance Update Management" chapter in the System Health Insights User Guide.