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DG/UX was a Unix operating system developed by Data General for its Eclipse MV minicomputer line, and later the AViiON workstation and server line (both Motorola 88000 and Intelmarker IA-32-based variants).

DG/UX 1.00, released in March, 1985, was based on UNIX System V Release 2 with additions from 4.1BSD. By 1987, DG/UX 3.10 had been released, with 4.2BSD TCP/IP networking, NFS and the X Window System included. DG/UX 4.00, in 1988, was a comprehensive re-design of the system. Later versions were based on System V Release 4.

On the AViiON, DG/UX supported multiprocessor machines at a time when most variants of Unix did not. The operating system was also more complete than some other Unix variants, for example when you bought the operating system it included a full C compiler (gcc) and also a logical volume manager. The OS was small and compact, but feature rich. It was simple and easy to install and did not require vast resources of memory or processing power. For example a six-way Pentium Pro-based AViiON would support several hundred users using text terminals.

The volume manager built into the OS was simple, but very powerful. All disk administration could be performed online, without taking any file system offline. This included extending, relocating, mirroring or shrinking. The same functions could be performed on the swap area, allowing in-place migrations of disk storage without downtime.

Later versions added support for processor and memory affinity to support their high-end multiprocessor NUMA AViiON system.


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