On Wed, 18 Feb 2009 20:11:53 +0000, Ted MacNEIL <eamacn...@yahoo.ca> wrote:
>> disagree with Ted that you've been "lucky" with ISPF edit since it does use an ENQ to protect on a member level basis. But that only works if everyone plays by those rules. > >As recently as z/OS 1.4, I have seen two people corrupt members using ISPF with different member names. > >>Also there has been some extra protection for a *long* time that keeps two tasks from opening a PDS for output (IEC143I 213-30 abend). > > >When you edit a PDS member, the file is not open for output. The member is just a memory copy. >It's opened for output, when you save it. >ISPF keeps information in memory, but does not re-read the directory. >So, if two people (or more) are editing members, directory already read, the last saver 'wins'. > >Try it! You won't like it. > >I did a test with some of our developers, just about two years ago. > >The data was corrupted. > Ted, you are completely wrong on this issue. Was your test done in a sysplex or MIMplex with the correct ENQ propagation? Or did you do it from two different environments that shouldn't have been sharing at the PDS level to begin with (it's okay to share if data sets are protected by RESERVE). I wish I had time to debate... but I'm off to a DR drill. I'm sure others who understand and live in environments with hundreds of ISPF users editing the same PDSes across systems in a sysplex and don't run into the problem you've described will chime in. Perhaps you should read the ISPF manuals also. Mark -- Mark Zelden Sr. Software and Systems Architect - z/OS Team Lead Zurich North America / Farmers Insurance Group - ZFUS G-ITO mailto:mark.zel...@zurichna.com 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 lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
