On Wed, 5 Nov 2008 11:53:55 -0600, Mark Zelden 
<[EMAIL PROTECTED]> wrote:

>Isn't that what all (sane) shops do?  That is one of the main benefits
>of a parallel sysplex environment (rolling IPLs).

I guess I know where *we* stand...

Though we have some sysplex here, we are not yet taking advantage of 
rolling IPLs.  We cook on our sandbox, then cook more on a first-run subset of 
development systems, plus, insanely, one production system, and then, more 
insanely, hit all remaining systems.  Altering this process is an uphill 
battle...

In a past life as a service provider, I witnessed many customers successfully 
use rolling IPLs with anywhere from 1 week to 1 month in between.  The 
caveat of co-requisite maintenance or "step-up" maintenance is rare, but 
requires vigilance.  Now that I've been in a JES3 shop, I've learned that 
rolling 
IPLs can be compromised with a Global Warm-Start.  

Cheers,
Art Gutowski
Ford Motor Company ITInfrastructure

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