On Fri, 11 Feb 2011 09:59:23 -0600, Jeff Holst <[email protected]> wrote:
>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 > Hi Jeff, "If it hurts, don't do it". I don't know that there is a definitive answer documented. Of course DISP=OLD always gives you the most amount of any PDS integrity / corruption issues related to sharing and any products that may not play by the rules that have been documented "forever". I've always preferred DISP=SHR in logon procs/clists so I could look at issues that users were having without them having to logoff. Also, remember that a change was put in a long time that prevents two tasks from opening a PDS for output, which was a cause of corruption in the past. So DISP=OLD is also a throwback to a time when that protection didn't exist. Cheers, Mark -- Mark Zelden - Zelden Consulting Services - z/OS, OS/390 and MVS mailto:[email protected] Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html Systems Programming expert at http://expertanswercenter.techtarget.com/ ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
