Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: $Revision: 1.6.2.14 $; site ciprico.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!ihnp4!stolaf!umn-cs!mmm!ciprico!dan 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. ------- -Dan A. Dickey ihnp4!mmm!ciprico!dan