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Article #374Re: The POSIX file system
From: Moderator, John Quarterman
Date: Tue, 04 Nov 1986 01:38
Date: Tue, 04 Nov 1986 01:38
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From: jbs@eddie.mit.edu (Jeff Siegal) Date: Mon, 3 Nov 86 17:44:44 EST Organization: MIT, EE/CS Computer Facilities, Cambridge, MA In article <6206@ut-sally.UUCP> guy@sub.com (Guy Harris) >[...] The file system was implemented by a process that ran in supervisor >mode and which received messages telling it to do things like read from or >write to a file. Other operating systems, like RSX-11 and VMS, did the same >thing. I believe the latest descendents of MERT, and VMS, have moved the >file system back into the kernel for performance reasons. Quite far off, actually (at least in the case of VMS). Current versions of VMS have replaced the disk filesystem ACP (which previously was a separate process) with the XQP, a separate instance of which exists in _each_process_ (the code is shared). This resulted in some significant performance _improvements_, and a filesystem which extends fairly easily and quite completely (including record/file locking, etc.) over different machines (using DEC's inter-system CI bus). Jeff Siegal Volume-Number: Volume 8, Number 31
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!mnetor!seismo!ut-sally!std-unix From: std-unix@ut-sally.UUCP (Moderator, John Quarterman) Newsgroups: mod.std.unix Subject: Re: The POSIX file system Message-ID: <6219@ut-sally.UUCP> Date: Mon, 3-Nov-86 20:38:41 EST Article-I.D.: ut-sally.6219 Posted: Mon Nov 3 20:38:41 1986 Date-Received: Tue, 4-Nov-86 03:19:04 EST References: <6206@ut-sally.UUCP> Organization: IEEE P1003 Portable Operating System for Computer Environments Committee Lines: 23 Approved: jsq@sally.utexas.edu