What complicates "all the same size" is SCM (zFlash) so I suppose we have to add the words "except SCM" somewhere in the discussion of paging space utilisation.
Cheers, Martin Martin Packer, zChampion, Principal Systems Investigator, Worldwide Banking Center of Excellence, IBM +44-7802-245-584 email: martin_pac...@uk.ibm.com Twitter / Facebook IDs: MartinPacker Blog: https://www.ibm.com/developerworks/mydeveloperworks/blogs/MartinPacker From: R Hey <000000bb27d4e6cb-dmarc-requ...@listserv.ua.edu> To: IBM-MAIN@LISTSERV.UA.EDU Date: 07/07/2015 05:54 Subject: Re: PAGE DS 30% same-size Sent by: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> Just found Ron's post from 2010 > Subject:Re: PAGE datasets -- few large or more small ....from Greg Dyck ... - Individual local page datasets should not exceed 30% (or 25% if you choose) utilization because the contigious slot allocation algorithm becomes inefficient/unsuccessful for that dataset. The utilization% at a total paging subsystem level is irrelevent with respect to the algorithms. - All local page datasets should be the same size (or close to it in slots) and device type because of ASMs round robin allocation algorithm. If one page dataset has 12000 slots and another has 24000 the utilization% on the second will be about 1/2 of the first. > cheers ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
