Installation guide

1
Introduction to Migrating from ULTRIX to
DIGITAL UNIX Systems
This chapter is an overview of migrating from the ULTRIX and ULTRIX
Worksystem Software (UWS) operating system, Version 4.2 and higher, to
the DIGITAL UNIX operating system, Version 3.0 and higher. It begins by
describing some DIGITAL UNIX features that are unavailable on ULTRIX
systems. Then, it gives brief information about features that are common to
both systems, followed by a list of ULTRIX features that are unavailable on
DIGITAL UNIX systems.
This chapter also mentions each of the migration issues that can affect you
as you move to a DIGITAL UNIX system. You can use this information to
assess the effort involved in migration. Detailed information about
migration from ULTRIX to DIGITAL UNIX systems is provided in the rest
of this manual.
1.1 DIGITAL UNIX Features Unavailable on ULTRIX
Systems
The following DIGITAL UNIX system features are unavailable on ULTRIX
systems:
• OSF/1 kernel
• Real-time kernel
• Improved standards conformance
• Shared libraries
• Increased number of per-process open file descriptors
• Logical storage management
• Streams
• Memory-mapped files
• Sixty-four bit data types and addresses
• Security integration architecture (SIA)
• Increased number of pseudoterminals (ptys)
• Debugging support for multithreading
Introduction to Migrating from ULTRIX to DIGITAL UNIX Systems 1–1