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Back when we were on 8xx boxes we followed the IBM recommendation.  But I 
can see your point.  If your production lpar is down then who (outside of 
systems) gives a tink if your development lpar is up?  So why go the added 
expense, and maintenance, of having a separate controlling lpar?  However 
if you have multiple, independent production lpars (like different 
divisions on different timezones) then you may want a controlling lpar. Or 
if you are doing a poor man's HA solution in which you use one box but you 
want it available if you are doing full system saves, upgrades, etc.  The 
problem with this sort of an HA solution is that you still have downtime 
to put the latest OS on the controlling lpar.  And on 5xx boxes it doesn't 
go away.  You still have downtime when you put on FSP upgrades.  But we're 
getting redundant FSP's this month.

Rob Berendt

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