Types of Upgrade

Rolling Upgrade

In a rolling upgrade, you upgrade the HP-UX operating system (if necessary) and the Serviceguard software one node at a time without bringing down your cluster. A rolling upgrade can also be done any time one system needs to be taken offline for hardware maintenance or patch installations.

This method is the least disruptive, but your cluster must meet both general and release-specific requirements. See “Guidelines for Rolling Upgrade”.

Non-Rolling Upgrade

In a non-rolling upgrade, you halt the cluster before upgrading HP-UX (if necessary) and the Serviceguard software.

This method involves cluster down time, but allows for a broader range of upgrades than rolling upgrade. For example, you will need to do a non-rolling upgrade, or a migration with cold install, if you are upgrading from an older release of Serviceguard than rolling upgrade supports (see the Release Notes for the target version of Serviceguard for the specific rolling upgrade requirements).

Migration with Cold Install

A cold install involves an installation or re-installation of HP-UX. It erases the current operating system and data and then installs the new operating system and software; you must then restore the data.

The advantage of migrating with cold install is that the software can be installed without regard for the software currently on the system or concern for cleaning up old software.