Installation manual

H
Small Capacity System Disks
This appendix describes some methods you can use to manage small capacity
system disks. Some specific recommendations are also included for installing or
upgrading to OpenVMS VAX Version 7.3 and DECwindows Motif for OpenVMS
VAX Version 1.2-6 on an RZ24 or RA80 system disk. (These recommendations
also apply to earlier versions of the DECwindows Motif for OpenVMS VAX
layered product.)
Note that you can use the methods described in this appendix to free disk space
on any space-constrained system.
H.1 Limited Space Support
As the OpenVMS VAX operating system and associated layered products continue
to develop and mature, their sizes have grown. Previously acceptable system
disk devices might now have insufficient capacity for the desired computing
environment. Support for added features, conformance to standards, addition of
online documentation, and especially, support for a graphical user environment
(specifically, DECwindows Motif for OpenVMS VAX) have contributed to this
growth. Although a single-user workstation system might be perceived as entry
level, it does, in fact, have an increased need for system disk capacity to handle
the desired graphical environment.
H.1.1 Limited Space Support Option
In the past, when the OpenVMS VAX operating system grew too large for a
specific disk type, that disk was no longer supported as a system device. The
OpenVMS VAX Version 7.3 operating system and the DECwindows Motif for
OpenVMS VAX layered product cannot fit, in total, on an RZ24 disk device.
However, to preserve the investment in some user configurations, a limited space
support option has been introduced that allows the RZ24 to continue to be used as
a system disk but with some features removed. For the most part, these features
include new online documentation, programming examples, and programming
support files. The most important mechanisms used to provide this environment
are the OpenVMS VAX and DECwindows tailoring facilities, VMSTAILOR and
DECW$TAILOR. (For more information about these facilities, see Chapter 10.)
The limited space support option means that, although the disk (in this case,
the RZ24) is supported as a system device, you must take some explicit action to
remove or not to install some portions of the product so the remainder fits. This
option gives small, resource-constrained system users a choice between investing
in new hardware or continuing with existing hardware but with (possibly)
reduced capabilities.
Small Capacity System Disks H–1