I ran into an issue recently when testing the Fault Analyzer GUI. One of its 
functions causes the Fault Analyzer GUI server to try to read a member if the 
user's ISPF profile data set. This was failing because we have this data set 
allocated as DISP=OLD in the TSO user's address space. Needless to say the 
function does not work so well when the TSO user is logged on.

I did some research and found that the ISPF documentation has plenty of 
examples showing how to set up a TSO logon proc or CLIST to allocate the 
required ISPF data sets. Some show ISPPROF with DISP=SHR, but more show 
it with DISP=OLD. I have yet to find a firm recommentation as to which way 
this should be allocated. 

I doubt that update integrety would be an issue in our environment, as  the 
userid is the HLQ for the data set, and we do not permit users to be logged on 
more than once within the same sysplex.

Is allocating this data set DISP=OLD a throwback to some earlier epic, and the 
doc (and our shop) has simply not caught up, or is there a good reason why 
we should keep this as it is?

Jeff Holst
Fiserv

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