On Fri, 27 Mar 2009 11:44:18 -0700, Smith, Sean M <[email protected]> wrote:
>Fellow IBMers and Mark. Zelden in particular, > >I am modifying an assembler program and I have a need to have a single >digit unique identifier for a system within a SYSPLEX. I started by >looking at Mark Zelden's IPLINFO (thanks again Mark...this has been a >huge boon to me REXX skill set as I reference your techniques >frequently). I looked at the following fields (field names from >IPLINFO): > > >LPAR_# From PCCA + 7 >CSDPLPN From CSD + 252 >JESDSNID From JESPEXT + 100 - Recognizing this is actually a 2 digit >field > > >The program I am modifying is being used in z/OS 1.8 - z/OS 1.10 in both >JES2 and JES3 and in VM guests. The VM Guests ruled out CSDPLPN and >LPAR_# as it always came back as 0 on guests. JESDSNID seems to fit the >bill especially with the description from the IPLINFO utility: > >'This was system number' Format(JESDSNID) 'added to the sysplex.' > >My question is whether or not this field really represents the sequence >a system was added in to the SYSPLEX. From the Data Areas manuals I see >this description: > >JESDSNID ID for temporary data > > sets on this system. > >I did a test on 3 systems to check out this field. All three systems >are in the same SYSPLEX but one is in its own JES MAS. The numbers came >back all unique (1,2,3) so I am encouraged. > >Any commentary or suggestions about my quandary are as always greatly >appreciated. > >Sean It's not documented as such, but empirical evidence has shown me that JESDSNID does indeed represent the sequence a system was added into the SYSPLEX. Since DASD and other resources are assumed to be shared in a sysplex, that number must be unique to avoid duplicate temp data set names. Mark -- Mark Zelden Sr. Software and Systems Architect - z/OS Team Lead Zurich North America / Farmers Insurance Group - ZFUS G-ITO mailto:[email protected] z/OS Systems Programming expert at http://expertanswercenter.techtarget.com/ Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html ---------------------------------------------------------------------- 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
