On 9/17/09 2:16 PM, "Adam Thornton" <athorn...@sinenomine.net> wrote:

 
> "Administrator typo" is not a failure mode the operating system is
> designed to protect you from.

That may be true now, but I think the point of the argument is that it
should not be. 

On VMS, if you have a SYSTEM priv bit set, the system will still warn you if
you're about to do something that seems stupid. If there is an architected
limit (note that the 9.7TB got clipped to 8TB, so SOMETHING noticed a
problem), then it's not too unreasonable for the system to take defensive
measures and issue a warning that all is not right in in the kingdom of
Denmark, cream or no cream dresses.

It seems like a basic defense that if CP notices you starting something that
it KNOWS it may not have resources to complete, requiring confirmation that
you know what you're doing (or about to do) is a good defensive measure.

Did the system do what you told it to do when you told it to do it? Yes.
Whether it should march off a cliff without at least questioning the order
is the question at hand.

-- db

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