Re: ioctls, etc. (was Re: [PATCH 1/4] sas: add flag for locally attached PHYs)

Alan Cox
2005-10-24T15:13:37Z

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.