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From: p554mve@mpirbn.mpifr-bonn.mpg.de (Michael van Elst)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Filesystem Speeds (was Re:  GVP Trade-in)
Keywords: SCSI, GVP
Message-ID: <1169@mpirbn.mpifr-bonn.mpg.de>
Date: 8 Sep 90 15:07:10 GMT
References: <552@DIALix.UUCP> <14069@cbmvax.commodore.com> <558@DIALix.UUCP> <6499@sugar.hackercorp.com> <1159@mpirbn.mpifr-bonn.mpg.de> <14260@cbmvax.commodore.com>
Reply-To: p554mve@mpirbn.UUCP (Michael van Elst)
Organization: Max-Planck-Institut fuer Radioastronomie, Bonn
Lines: 21

In article <14260@cbmvax.commodore.com> jesup@cbmvax (Randell Jesup) writes:
>	Elevator only helps in the case of 3 or more tasks making
>accesses at the same time.  Read-ahead does help in multiple-access 
>situations, but more and more SCSI drives have built-in read-ahead.  Your
>points on single-user are on-target.  Remember, though, that a lot of
>Unix machines are effectively single-user and rarely have multiple-accesses
>occurring (though more often than AmigaDos).

Well, that's true, I wanted to tell what's the difference between
single user and multi-user filesystems.
But even if you think that Unix machines are single-user there are usually
nonconsecutive disk accesses as program code is (hopefully) demand-loaded and
larger program systems (should I say X-window servers :-)) will
often page in and out while the user's program is running.

Regards,
-- 
Michael van Elst
UUCP:     universe!local-cluster!milky-way!sol!earth!uunet!unido!mpirbn!p554mve
Internet: p554mve@mpirbn.mpifr-bonn.mpg.de
                                "A potential Snark may lurk in every tree."