"Mike Feeley" <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>... > I'm thinking of changing PLPA to the minimum size of 1 cylinder and letting it > overflow into the COMMON page dataset. Is there any issues with allocating > a huge COMMON page dataset? For example, if my LPAR only requires a > combined PLPA and COMMON size of 800 cylinders, can I used an entire 3390- > 3 for the new PLPA (1 cylinder) and COMMON (the rest of the volume, around > 3337 cylinders)? Any issues with the large number of page slots, memory > usage, etc. This is for z/OS 1.8 on a z9 box. Nothing else will use this > volume. It will either be 100% utilized with PAGE datasets or 100% utulized > with PAGE datasets plus a placeholder (filler) dataset. I don't know why I > can't just create a huge COMMON page dataset and be done with it versus > creating a 700 cylinder COMMON this year and maybe then a 800 cylinder
> COMMON in 2 more years, etc. Just create the one huge COMMON page > dataset and I will be set well into retirement. What are the downfalls from > doing something like this? > Mike, There are a couple of things to consider: The ancient advantage of a 1 cyl PLPA and a large COMMON, the Seldom Ending Channelprogram, has been retired a couple of z/OS releases ago, so that one has gone. However, a new feature has come into play: PAV. ASM will request 2 alias UCBs for every pagedataset on a volume, so a fullsize PLPA and a fullsized COMMON will give you 3 paths to each of them. But, if your system, like most modern systems, does not do much paging anymore and especially not on PLPA and COMMON, this advantage has little weight. So, yes, if you want to design a PLPA/COMMON configuration that is to last till your retirement, a 1 cyl PLPA and a huge COMMON will probably be the best. 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
