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    SubjectRe: ioctls, etc. (was Re: [PATCH 1/4] sas: add flag for locally attached PHYs)
    On Llu, 2005-10-24 at 09:51 -0400, Luben Tuikov wrote:
    > controls and how. Understanding how the factory workers use it and what
    > they expect. Understanding the code (which may not be as easy). Then it
    > is rewritten so that it can be easily supported and maintained.

    Very very rarely, because it means down time and supporting two systems
    at once. Take a look at the australian customs fiasco or the british
    passport office disaster to see why (actually almost any large
    government IT project where politics dictated 'write new stuff so I can
    announce it in parliament').

    The smart factory update would occur piece by piece. Starting with the
    most pressing problems (ie fastest ROI) and working to a plan that ends
    up with the system modular and clean.

    You don't turn a steel plant off for a software upgrade.

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