Installation guide

application to use a different number of open file descriptors, see
Section 8.3.
1.1.6 Logical Storage Manager
The Logical Storage Manager (LSM) subsystem is a replacement for the
Logical Volume Manager of previous DIGITAL UNIX systems. See
Chapter 4 for more information.
1.1.7 Streams Kernel Mechanism
System V Release 3.2 STREAMS is included in the DIGITAL UNIX system.
STREAMS is a kernel mechanism that supports development of network
services and data communications drivers. The STREAMS mechanism
consists of a set of system calls, kernel resources, and kernel routines that
can create, use, and dismantle a stream. A stream is a full-duplex
processing and data transfer path between a driver in kernel space and a
process in user space.
1.1.8 Memory-Mapped Files
The DIGITAL UNIX system includes the Berkeley mmap function, which
allows an application to access files with memory operations rather than
file I/O operations. See mmap
(2) for more information.
1.1.9 Sixty-Four Bit Data Types and Addresses
The Alpha architecture is based on a 64-bit microprocessor. As such, it
introduces a number of extended capabilities beyond 32-bit architectures.
For example, 64-bit addressing allows the DIGITAL UNIX system to
support file system sizes greater than 2 gigabytes (GB). Most applications
only require a recompilation in order to run on a DIGITAL UNIX system.
However, if you want your application to be portable (run on both 32-bit
and 64-bit systems) and to interoperate with programs on other systems,
you must check the C coding techniques. Chapter 7 describes specific
aspects of the C language and explains certain programming techniques
that will help both new program development and the migration of existing
programs from ULTRIX to DIGITAL UNIX systems.
1.1.10 Security Integration Architecture
The DIGITAL UNIX system includes the security integration architecture
(SIA). SIA is a framework that can support multiple, layered security
mechanisms on a system.
1–4 Introduction to Migrating from ULTRIX to DIGITAL UNIX Systems