Message-Id: <200502152121.j1FLLMcP024112@turing-police.cc.vt.edu>
To: Linas Vepstas <linas@austin.ibm.com>
Cc: Diego Calleja <diegocg@gmail.com>, Lee Revell <rlrevell@joe-job.com>,
       prakashp@arcor.de, paolo.ciarrocchi@gmail.com, gregkh@suse.de,
       pmcfarland@downeast.net, linux-hotplug-devel@lists.sourceforge.net,
       linux-kernel@vger.kernel.org
Subject: Re: Optimizing disk-I/O [was Re: [ANNOUNCE] hotplug-ng 001 release] 
In-Reply-To: Your message of "Tue, 15 Feb 2005 13:56:14 CST."
             <20050215195614.GT23424@austin.ibm.com> 
From: Valdis.Kletnieks@vt.edu
References: <20050215004329.5b96b5a1.diegocg@gmail.com>
            <20050215195614.GT23424@austin.ibm.com>
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On Tue, 15 Feb 2005 13:56:14 CST, Linas Vepstas said:

> Now I like this idea. It need not have anything to do with startup,
> or with any particular program or distro whatsoever.  Rather, one 
> would have a daemon keeping track of disk i/o patterns, and constantly 
> trying to figure out if there is a rearrangement of the sectors on disk
> that would minimize i/o seeks based on past uasge. 

More prior art - a company called FDR made a disk compactor product for IBM's
OS series, and I seem to remember a SHARE (IBM mainframe user group) tape that
had a program to read the I/O trace table and generate an optimal "what goes
where" command stream for FDR's software.  Again a late 70s to early 80s thing.

(Probably not enough to be "prior art" by itself, but certainly goes towards
the "obviousness to a practitioner in the field" criteria - if *I* knew about it
as a junior sysadmin at a college in middle-of-nowhere upstate NY knew about
it in 1983.. ;)


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