Availability Guide for Change Management

Availability Guide for Change Management–125506
3-1
3
Making System Software and
Hardware Changes Online
Overview
Being able to make changes to your system software and hardware online is one way
you can reduce—or even eliminate—planned outages. Changing your system software
and hardware can involve installing a new operating system release, expanding your
system to include a new system component, upgrading a system component to take
advantage of a new technology, or simply moving an existing system component.
This section provides information to help you reduce or eliminate planned outages by:
•
Explaining how you can configure your system to accommodate future growth.
•
Identifying system software changes that you can perform online. Online change is
any change that can be performed while your NonStop system is still operational. In
some situations, online changes may temporarily affect application availability.
•
Identifying the hardware changes that you can perform online and describing step-
by-step procedures for making common hardware changes online.
•
Telling you which manuals contain more information about the changes described in
this section.
System Software Changes
System software changes are changes to the operating system image that do not involve
changes to the hardware. Types of system software changes include:
•
Software-configuration changes made in the configuration file. These types of
changes include changing logical device names and configuration attributes.
•
Installing a new operating system release.
•
Installing an interim product modification (IPM).
Software Configuration Changes
You use the Subsystem Control Facility (SCF) on G-series systems to configure, control,
and display information about configured objects within SCF subsystems. When you
install a G-series release on a Himalaya S-series server, the $SYSTEM disk and a few
other initial system-load processes are preconfigured and SYSGENR uses the
CONFTEXT file to establish some system attributes for all processors. Then you finish
the system configuration by using SCF.
•
SYSGENR configures a newly installed system or updates the system configuration
when you install a new operating system release. Changes performed with
SYSGENR are offline changes. SYSGENR is documented in the System
Generation Manual for G-Series Releases.