Re: [SAGE] number of eggs in a basket

[Brad Knowles <brad@stop.mail-abuse.org>]

At 2:56 PM -0600 2005-01-07, nmedbery@museverte.net wrote:

>                                                                     At
>  least the acceptance environment should have the same redundancy as
>  production to make sure the given application/service functions in that
>  specific configuration.

	Ideally, yes.  In reality, most places probably won't be able to 
afford to do that.


	I know that AOL had enough parts of different systems that they 
could configure pretty complete replicas of various different parts 
of production systems one at a time, but didn't have enough 
components to be able to simulate the entire production online 
service at the same time.

	They also had several different versions of different components 
that they needed to be able to run, in order to support other parts 
of the system, or other customers (e.g., for the period of time that 
Apple still had eWorld).

	There were some Stratus modules that were dedicated to mail on 
the production systems but which had to be shared for the Test/QA 
systems, and sometimes they had to be taken down and reconfigured for 
use with some of the other groups.

-- 
Brad Knowles, <brad@stop.mail-abuse.org>

"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."

     -- Benjamin Franklin (1706-1790), reply of the Pennsylvania
     Assembly to the Governor, November 11, 1755

   SAGE member since 1995.  See <http://www.sage.org/> for more info.