HP-UX SNAplus2 R7 Upgrade Guide (September 2005)

Upgrading from Earlier Versions of SNAplus2 to R7
Planning the Upgrade Process for a Client/Server System
Chapter 2 9
Planning the Upgrade Process for a
Client/Server System
If your SNAplus2 Release 7 system is a client/server system, you have a
choice of upgrade strategies. The appropriate strategy depends on the
structure of your SNAplus2 Release 7 system and the way you use it.
This section describes the options available and provides information to
help you select the most appropriate strategy. You should review these
options and plan the process before you start to use the information in
the remaining chapters in this book.
The simplest strategy is to upgrade all computers in the SNAplus2
system at the same time. This means that computers at different levels
of the software do not need to interoperate, and so avoids the additional
complexity involved in managing a mixed network. For more
information, see “Upgrading a Complete Client/Server System in One
Pass”. The disadvantage of this strategy is that the SNAplus2 software
must be stopped on all computers in the network until you have
completed the upgrade process on all of them, which may result in
unacceptable downtime if you have a large network.
If you cannot stop the complete system during the upgrade process, it is
possible to upgrade the system as a phased process, so that the
SNAplus2 software is stopped on only one computer at a time. This
means that users can continue using the facilities of the SNAplus2
system during the upgrade process, with a minimum of disruption.
However, this strategy places a few restrictions on interoperation
between computers running different levels of the SNAplus2 software,
and adds some complexity in administering the mixed-level system. For
more information, see “Phased Upgrade of a Running Client/Server
System”.
Upgrading the Operating System
When the upgrade includes an upgrade of the operating system, the
kernel and SDLC configuration will be lost during the upgrade. However,
in order not to lose your existing SDLC configuration files, HP
recommends that you save them to a temporary location before starting
the operating system upgrade. Restore the files after the upgrade is
complete.