All this is being done while your applications continue to run on the remaining members of the cluster. It's fast, it's easy, and it keeps the level of availability as high as you need it while boosting performance. Patches can be installed remotely thereby guaranteeing that the network capabilities of the system cannot be disabled during the patch operation. The integrity of the running system is not compromised while installing patches. More specifically, patches will not overwrite files currently in use.
Applications running on the target system operate while patches are being installed.
Add capacity to the system, remove components for upgrades, alter system configurations, and replace components while the system is running. Components may be storage devices, power supplies, CPUs, memory, QBBs, etc.