Core operating system

Multi-path I/O

Multi-path I/O is supported. See ``Managing multipath I/O environments''.

Java support

Java applets are fully supported on UnixWare.

The Java Development Kit is provided with UnixWare. See Java Development Kit Release Notes for information.

Memory management

• Large memory support is available. This includes:

  • 64GB of special purpose memory (shared memory objects used by databases)

  • 4GB of general purpose memory

  • Improved autotuning of the operating system, allowing for decreased administration/configuration of large memory systems.

  • Support for Physical Address Extension (PAE) mode of the Pentium Pro processor, allowing the processor to address up to 64GB of memory.

    When PAE mode is enabled, automatic detection and configuration of up to 64GB of memory in the operating system.

  • Dynamic shared memory (DSHM). This is a mechanism that allows a very large special purpose memory object to be created and addressed by a process via dynamic mappings. Maximum size is up to 64GB. This feature is limited to PAE mode.

• Scalability, performance and reliability are improved.

• Extended user virtual address space is available. This is a mechanism that allows the 3GB user process and 1GB kernel virtual address space ranges to be adjusted so a process can address more than 3GB.

  It is recommended only for 4GB systems running in non-PAE mode, when one of the applications needs to address most of the physical memory on the machine, (for example, a database). This feature is an alternative to PAE mode and DSHM, when the physical memory is still small enough to be addressed in non-PAE mode.

See ``Managing Large Physical Memory'' and ``Configuring your system for Large Physical Memory''.

Large file support

File systems up to 2^40 bytes (1TB) are supported. A single file can thus consume up to 1TB of disk store. A sparse file can exhibit length up to 2^63 bytes. New system interfaces, lseek64 and mmap64, permit operations of this entire length. Compiler extensions allow for a C application to conveniently manipulate files of such size via 64 bit integers (called ``long long'').

A limited set of system utilities have been made large file aware, and are noted as such on their respective manual pages.

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NOTE: Large file support is intended for specialized applications which need to deal with more than 2GB of data in a single file, and not for general purpose text files and similar.

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See ``Large File Support'' and ``Managing large files''.

System boot

• The boot loader is capable of recognizing memory of up to 4GB in size via BIOS call e820. This allows the memory of large systems to be automatically configured without user intervention.

• A new and improved Boot Command Processor supports booting from any BIOS-addressable disk.

• A built-in Boot Manager can boot any OS from any partition.