HP Tru64 UNIX Version 5.1B-2 and Higher Patch Kit Installation Instructions (March 2009)

4 Patching a Cluster
The following sections describe the procedures for installing the patch kit using the following
methods:
• Rolling upgrade procedure (“Rolling Upgrade” (page 45))
• No-roll procedure (“No-Roll Patching” (page 73))
• Cloning procedure using the duclone script (“Using the dupclone Script” (page 75))
Rolling Upgrade
A rolling upgrade is a software upgrade of a cluster that is performed while the cluster is in
operation. Patching your system is one type of upgrade that can be performed using this
procedure. The term “Rolling Patch” is sometimes used to describe the patching process using
the Rolling Upgrade procedure. In general, the terms Rolling Patch and Rolling Upgrade are
synonymous in this chapter.
In a Rolling Upgrade, one member at a time is upgraded and returned to operation while the
cluster transparently maintains a mixed-version environment for the base operating system,
cluster, and Worldwide Language Support (WLS) software. Clients accessing services are not
aware that a rolling upgrade is in progress.
A rolling upgrade consists of an ordered series of steps, called stages. The commands that control
a rolling upgrade enforce this order.
When performing a rolling upgrade, the same procedure is used for patching your system as for
upgrading to a new operating system or TruCluster version. The principal difference is that for
a rolling patch you use the dupatch utility and for a rolling upgrade you use the installupdate
utility during the install stage.
This chapter provides the same information as the Rolling Upgrade chapter of the Cluster
Installation manual. It is provided here as a convenience so you can review your patching options
in one manual.
Note:
If you have not yet created your cluster, we recommend that you patch your system first. See
“Patching a System Prior to Creating a Cluster” for this time-saving procedure.
The first part of this chapter contains instructions for performing a rolling upgrade, for displaying
the status of a rolling upgrade, and for undoing one or more stages of a rolling upgrade. Those
interested in how a rolling upgrade works can find the details in “Rolling Upgrade Commands”
and the sections that follow it.
This chapter discusses the following topics:
• Tasks, and combinations of tasks, you can perform during a single rolling upgrade (“Rolling
Upgrade Supported Tasks”)
• Tasks you cannot perform during a rolling upgrade (“Unsupported Tasks”)
• How to perform a rolling upgrade (“Rolling Upgrade Procedure”)
• How to display the status of a rolling upgrade (“Displaying the Status of a Rolling Upgrade”)
• Iimportant information you need to be aware of if you remove or reinstall patches during
a rolling upgrade (“Removing Patches Installed During a Rolling Upgrade” (page 54))
• Displaying the status of a rolling upgrade (“Displaying the Status of a Rolling Upgrade”
(page 58))
• How to undo the stages of a rolling upgrade (“Undoing a Stage”)
• The commands used during a rolling upgrade (“Rolling Upgrade Commands”)
• Rolling upgrade stages (“Rolling Upgrade Stages”)
Rolling Upgrade 45