net management/people resources?

[Larry Snyder <larrys () lexis-nexis com>]

For those running an 'umbrella' package (OV/Tivoli/CA/etc) I'm just
wondering if there's a common ratio between the number of managed nodes
in a reasonably dynamic environment and the number of people actually
maintaining the management package (not the users).  As an aside, I'm
a bit curious as to the favorite umbrellas in use.
thanx,
-ls-