My understanding from talking with a level 2 manager at IBM, is that the 
original green screen applications (z/VM based) are still running. 
What has changed is the method of access.

Regardless of the residence of the applications, there exist (except possibly 
on Windows platforms) availability options to 
completely eliminate the need for 12 hour outages. 

It seems that IBM has *chosen* not to use these options...

<snip>
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf 
Of John Gilmore
Sent: Tuesday, October 08, 2013 8:47 AM

The misjudgment consisted in choosing edge servers initially.   This
facility should have been implemented on a mainframe, where adequate 
availability is a given.

Complaints about and expectations for the availability of the IBM-Support 
portal have always been unrealistic.  They are extrapolations from the 
complainers' mainframe experience that are inappropriate to a different, much 
more fragile environment, one in which failures, reboots, and frequent 
'quiescences' for maintenance are the norm.
</snip>

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