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

[Luben Tuikov <luben_tuikov@adaptec.com>]

On 10/24/05 11:41, Alan Cox wrote:
> 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.

There was 0 (zero) effective downtime to the factory.

	Luben
-- 
http://linux.adaptec.com/sas/
http://www.adaptec.com/sas/
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