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From: dan@ciprico.UUCP
Newsgroups: net.periphs
Subject: Re: caching disk controllers for Unix
Message-ID: <10800002@ciprico.UUCP>
Date: Thu, 10-Jan-85 10:15:00 EST
Article-I.D.: ciprico.10800002
Posted: Thu Jan 10 10:15:00 1985
Date-Received: Wed, 16-Jan-85 05:05:46 EST
References: <69@mot.UUCP>
Lines: 12
Nf-ID: #R:mot:-6900:ciprico:10800002:  0:693
Nf-From: ciprico!dan    Jan 10  9:15:00 1985


Here at ciprico we make a caching disk controller for the multibus.  SMD
interface.  I don't have any real numbers handy at the moment but caching
helps a great deal...approx. +30% performance.   And, a lot more depends on
how the caching is performed.  We did a study here to see how unix really
accessed the disk (this means requests handed to the driver).  With some
intelligent caching I'd think we could increase the performance by at least 50%.
By all means look into caching disk controllers....if you find anything
interesting I'd be interested in hearing about it.
Oh yes...the study was done on System III...512 byte file system blocks.
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-Dan A. Dickey		ihnp4!mmm!ciprico!dan