All, Shmuel's reply prompts me to suggest that you consider what lies outside the nine dots.
Firstly, would you consider thin provisioning of the installation volumes and SYSRES? This will get you onto 3390-A for these volumes using any size you want. Why is this good? Because DVE is also good. If you start out with 32K Cyls and later find it is not enough, just make the volume bigger. You need 40K Cyls, then just add 8K Cyls to the existing volumes. Sounds easy, but I'm not a software jockey. Second thing is ignore the previous paragraph and just allocate full sized 3390-A volumes with 262K Cyls. If you don't use the space on the volume then you don't use space in the disk array, and I think it will be some time before Serverpac manages to fill one of these pupies. All those that worked with RVA will remember over provisioning with 3390-3 when you only needed 3390-1 for your JES2 Checkpoint. This is the same thing. Finally, make all the data sets ten (yes 10) times larger than they need to be, with ten times the directory blocks you think you want. It is the same principle as above: if you don't use the space on the volume then you don't use the space in the disk array, OK, there is a sanity check on the the space you use in the array because of the page allocation boundaries. IBM uses 1GB pages, HDS uses 32MB pages, and I think EMC use 14MB pages. So an empty volume with just a VTOC & VVDS will consume 1GB, 32MB, and 14MB respectively from the pool of each vendor. For EMC and HDS the fragmentation generated by the Cylinder allocation area with just a VTOC , and the empty space in datasets is fairly small and does not dramatically inflat the pool usage (remember NCL?), but for IBM the 1GB page size may need some monitoring. Embrace the future of z, because it is already here. Now you guys that know better can shoot me down: shields are up :-) Ron Sent via the Samsung Galaxy Note® 8.0, an AT&T 4G LTE tablet -------- Original message -------- From: "Shmuel Metz (Seymour J.)" <[email protected]> Date: 04/30/2014 15:01 (GMT-08:00) To: [email protected] Subject: Re: [IBM-MAIN] New install library size In <[email protected]>, on 04/30/2014 at 01:55 PM, John Eells <[email protected]> said: >As some have observed, not everything can be a PDSE. Then I urge you to overallocate directory entries. -- Shmuel (Seymour J.) Metz, SysProg and JOAT ISO position; see <http://patriot.net/~shmuel/resume/brief.html> We don't care. We don't have to care, we're Congress. (S877: The Shut up and Eat Your spam act of 2003) ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
