Abstract
This paper discussesthe design of the file system for DEMCS, an operating
system being developed for the CRAY-1 somputer at Los Alamos Scientific
Laboratory. The goals to be met, in particular the performance and usability
considerations are outlined. A descriptionis given of the user interface
and the general structure of the file systemand the file system routines. A
simple model of program behavior is used to demonstrate the effet of buffer-
ing data by the file system routines. A disk space allocation strategy is
descibed which will take advantage of this buffering. The last section out-
lines how the performance mechanisms are itegrated into the file system
routines.
