http://pic.dhe.ibm.com/infocenter/zos/v1r13/index.jsp?topic=%2Fcom.ibm.zos.r13.ieae100%2Fpagdss.htm > A 3390 device with 65,520 cylinders contains 11,793,600 slots.
That is 180 4KB slots or 720KB per cylinder. Page data sets cannot extend past Cylinder 65520 or onto another volume. > Local page data sets. The local page data sets must be large enough to hold > the private area and VIO pages that cannot be contained in real storage. So the base pagespace needs to be 1X your core. If you want to take a stand alone dump, it will need to duplicate your core and your base pagespace, so you are up to 3X your core. Then monitor your actual slots in use, and expand your pagespace if utilization is above 30%. On Wed, Nov 19, 2014 at 11:15 AM, John Eells <[email protected]> wrote: > [email protected] (Lizette Koehler) wrote: >> >> I have been reviewing various documents on how to size the Page Data Sets. >> >> I was wondering if there are any guidelines on what can be used today. >> This >> should be kept to z/OS V1.12, 1.13 and 2.1 which I think will be the more >> dominant operating systems in use right now. >> >> I know that the number of Slots will drive what I allocate. So I am >> looking >> for the following information. I have not done this in many years so I am >> very rusty. >> >> 1) How to calculate the number of slots per page datasets >> a) I need to base this on 3390 Mod 3/9/27/54 > > > See the Init & Tuning Guide, starting with 2.2, Page data set sizes. > >> 2) What do I need to stay away from when determining where the page >> datasets >> go >> a) For example, if I use a Mod27 and I need to place multiple page >> datasets on the volume >> Should they all be for the same LPAR if in a PLEX >> Should they all be for unique LPARs if in a Plex > > > Some of this can be found in topic: 2.6, Performance recommendations, but it > could probably stand some updates to account for things like DCM, HyperPAV, > and the number of concurrent connections supported by modern disk control > units. Please submit an RCF for things you think should be there, and are > not. > >> 3) What are the maximum values I can create a page dataset? >> Can I use a whole Mod3/9/27/54 for ONE page dataset? > > > Access Method Services, under DEFINE PAGESPACE, says: The maximum number of > paging slots for each page space is 16M. > > <snip> > > Hope this gets you started... > > -- > John Eells > z/OS Technical Marketing > IBM Poughkeepsie > [email protected] > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
