HP Serviceguard A.11.20- Managing Serviceguard Twentieth Edition, August 2011

Restrictions for DRD Upgrades
• Upgrade using DRD is supported only on HP-UX 11i v3.
• You must use the DRD software released with the September 2009 release of HP-UX 11i v3
or later.
You can obtain the DRD software free from HP (see “Rolling Upgrade Using DRD” ); you do
not have to upgrade the operating system itself, so long as you are running 11i v3.
• The cluster must meet both general and release-specific requirements for a rolling upgrade;
see “Guidelines for Rolling Upgrade” (page 359).
• Not all paths that are supported for rolling upgrade are supported for an upgrade using DRD,
and there are additional requirements and restrictions for paths that are supported; see the
Release Notes for the target version of Serviceguard.
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).
Non-Rolling Upgrade Using DRD
In a non-rolling upgrade with DRD, you clone each node's root disk and apply the upgrade to the
clone, then halt the cluster and reboot each node from its updated clone root disk.
This method involves much less cluster down time than a conventional non-rolling upgrade, and is
particularly safe because the nodes can be quickly rolled back to their original (pre-upgrade) root
disks. But you must make sure your cluster is eligible; see “Restrictions for DRD Upgrades” (page 359).
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.
Guidelines for Rolling Upgrade
You can normally do a rolling upgrade if:
• You are not upgrading the nodes to a new version of HP-UX; or
• You are upgrading to a new version of HP-UX, but using the update process (update-ux),
rather than a cold install.
update-ux supports many, but not all, upgrade paths. For more information, see the HP-UX
Installation and Update Guide for the target version of HP-UX.
Guidelines for Rolling Upgrade 359