Rex, See my >> comments below.
_________________________________________________________________ Dave Jousma Manager Mainframe Engineering, Assistant Vice President [email protected] 1830 East Paris, Grand Rapids, MI 49546 MD RSCB2H p 616.653.8429 f 616.653.2717 -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Pommier, Rex Sent: Tuesday, August 29, 2017 3:10 PM To: [email protected] Subject: extended GDG implementation **CAUTION EXTERNAL EMAIL** **DO NOT open attachments or click on links from unknown senders or unexpected emails** Hello list, I have what are probably simple questions regarding the relaxation of the 255 generation GDG limit. We are running z/OS 2.2 so are eligible for the relaxation. I know I need to make a change to the IGGCATx member to activate the capability and I need to add EXT to the GDG definition. So here are my (rather basic) questions. 1. Can I implement an IGGCATxx member short of an IPL? I don't have one now, relying on the defaults, and I don't see anything in the INIT&TUNING manual that indicates that I can implement this dynamically, sadly. <<not sure if a catalog restart would reread IGGCATxx. We did it via one of our maintenance IPLs across the plex. 2. Once it is active, can I use an IDCAMS ALTER to change between the old limit and an extended one? I am positive the answer to this is "no, it can only be done at GDG definition time" but am hoping. << no, sadly, we just tried this. ALTER does not allow you to change from std to EXT. 3. Here's the scenario that has led me to this point. We just discovered we have a tape based GDG defined with LIMIT(255) and we have had several generations fall off the end. This is data we need to recover. Presuming the answer to question 2 is "no" as I strongly suspect, does anybody see an unsurmountable problem with (carefully) uncataloging all the tape generations, redefining the GDG base as extended with an appropriate limit, and recataloging all the generations, including the ones that have fallen off? >>my storage guys say they rename the GDG's, fix the base, and rename them back. I cant say Ive tried that, but that’s what they tell me. TIA - again! Rex The information contained in this message is confidential, protected from disclosure and may be legally privileged. If the reader of this message is not the intended recipient or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any disclosure, distribution, copying, or any action taken or action omitted in reliance on it, is strictly prohibited and may be unlawful. If you have received this communication in error, please notify us immediately by replying to this message and destroy the material in its entirety, whether in electronic or hard copy format. Thank you. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN **CAUTION EXTERNAL EMAIL** **DO NOT open attachments or click on links from unknown senders or unexpected emails** This e-mail transmission contains information that is confidential and may be privileged. It is intended only for the addressee(s) named above. If you receive this e-mail in error, please do not read, copy or disseminate it in any manner. If you are not the intended recipient, any disclosure, copying, distribution or use of the contents of this information is prohibited. Please reply to the message immediately by informing the sender that the message was misdirected. After replying, please erase it from your computer system. Your assistance in correcting this error is appreciated. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
