> -----Original Message-----
> From: Testbed Support for GridPP member institutes [mailto:TB-
> [log in to unmask]] On Behalf Of Andrew Sansum
>
> On a big installation like this, its necessary to keep a close watch on
> generation related issues as things can rapidly go pear shaped. Moving a
> generation out of production at short notice (and plugging the gap in
> capacity) is not trivial.
>
I recall someone from CERN showing off a graph of failure rate
against age that they described as 'bath tub' shaped - high at
the start, then dropping off to remain level for a while, then
swinging back up again towards the end.
Ewan
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