"Pommier, Rex R." <[email protected]> wrote in message news:<[email protected]>.. . > Kees, > > Since nobody else chimed in here, I will. I think the system is working > as advertised. If you check the PAGEDEL or PAGEADD command in the > system commands reference, it says (at least my really old hardcopy) > > <quote> > > When you delete a page data set, the system migrates the in-use slots to > other data sets before it deletes the data set. > > The system keeps track of the in-use slots on both the old or deleted > data set and the new data set until the owner references the pages. > Thus, when you issue a PAGEADD command to allocate a new data set, the > system might indicate that some slots on the newly allocated data set > are already in use. As soon as the owner references a page, the system > frees the slot both from the newly allocated data set and from the data > set to which the page was migrated. > > </quote> > > IIRC, the reason for this is that the system keeps track of where the > in-use pages are located by page data set. When you delete a data set, > the system physically moves the pages to other data sets, but keeps the > page table for the original data set in memory, with just a pointer to > the new location of the pages. Since these pages are in use within the > table, when you allocate and activate a new data set, even though the > physical pages in your new data set aren't in use, the system can't use > them because the page table is still referencing the old pages by the > location where the pages were before you did the PAGEDEL. (or something > like that) > > HTH > > Rex
Hi Rex, Yes, that explains what I see. It is indeed what I feared, the system keeps track of frames that were in the old pagedataset, only I was afraid it would start looking for them again in the new pagedataset. You can imagine what chaos that would cause in a production system. But luckily it knows what it is doing. It is in my 1.8 system commands manual too. However I never thought of look for 'system internals' in the 'system commands' manual. Thanks a lot, Kees. ********************************************************************** For information, services and offers, please visit our web site: http://www.klm.com. This e-mail and any attachment may contain confidential and privileged material intended for the addressee only. If you are not the addressee, you are notified that no part of the e-mail or any attachment may be disclosed, copied or distributed, and that any other action related to this e-mail or attachment is strictly prohibited, and may be unlawful. If you have received this e-mail by error, please notify the sender immediately by return e-mail, and delete this message. Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries and/or its employees shall not be liable for the incorrect or incomplete transmission of this e-mail or any attachments, nor responsible for any delay in receipt. Koninklijke Luchtvaart Maatschappij N.V. (also known as KLM Royal Dutch Airlines) is registered in Amstelveen, The Netherlands, with registered number 33014286 ********************************************************************** ---------------------------------------------------------------------- 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
