HP -UX 11i Installation And Update Manual page 63

NOTE
Updating to 64-bit OS
update-ux defaults to the OS word-width that your system is currently
running. For example, if the target system is running 32-bit OS, this will
be the default for the new OS to be installed.
Changing an existing 64-bit OS to 32-bit is not supported. To return a
64-bit OS to 32-bit, use the Ignite-UX make_recovery or
make_net_recovery command to restore the 32-bit OS.
You can update a system from 32-bit OS to 64-bit OS while updating to
11i, provided that you consider these hardware and firmware issues:
• Is your system capable of running 64-bit operation? See the
Supported Systems table in Chapter 1.
• Is your system's firmware recent enough to support 64-bit operation?
See "Firmware Requirements" in Chapter 1.
• 64-bit binary data cannot be used by 32-bit applications. 64-bit is
useful if you need large address space, such as for use with very large
databases and large-scale modeling. 64-bit applications can be
compiled and linked on 32-bit systems; however, these applications
cannot be run on a 32-bit system.
If you're updating from HP-UX version 11.0 or higher, update-ux will
determine if your hardware and firmware are compatible with 64-bit
operation. If you're updating from HP-UX version 10.20, however, refer
to the Software Transition Kit available on the HP-UX Applications CDs.
The STK contains tools and documents to assess applications or libraries
that run on HP-UX 10.20 and 11.0 and help transition them to the 11i
64-bit operation. The Web site also has release notes and a FAQ with
details about supported systems and necessary firmware updates.
If you've decided to update to a HP-UX 11i 64-bit OS, use this command
(source is CDs mounted at /cdrom):
/usr/sbin/update-ux -s /cdrom -a 64
Chapter 2
Migrating to HP-UX 11i
Updating to 64-bit OS
63