stars...@mindspring.com (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
ee...@us.ibm.com
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