Tom Marchant wrote:
> Thanks for the clarification, John. When I read your previous comment:
>> the presence of even two and certainly of three different
>> levels of JES2 in the same MAS is 1) avoidable and 2) desirably
>> avoided without compromising 24/7 availability
> I took that as meaning that possible and desirable to _never_ have
> two different levels of JES2 in the same MAS. Now it appears that
> you meant that it should for as short a time as is practical.
and of course I did mean that; but I also meant that "as short a time as it
practical" can be and should be a very short interval indeed, one of some few
hours, not one of days or weeks.
I regret that this issue became a highly controversial one, and I must admit
that I am surprised that it did: I had no notion that it had the potential to
do so.
Toleration schemes, which attempt to make the non-incidental compresence of two
versions of some component in the same MAS possible, are, I think, generically
ill-advised. They are almost always management initiatives to resolve
technical problems without really addressing them; and as such they are all but
predestined to fail.
John Gilmore Ashland, MA 01721-1817 USA
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