On Mon, 30 Jan 2012 11:39:20 +0100, Vernooij, CP - SPLXM <kees.verno...@klm.com> wrote:
> >To be precise: ASM reserves 2 exposures *per pagedataset* not per >volume (i.e. 2n-1 Aliasses per volume), since/so you can allocate more >than 1 pagedataset on one volume. We do so to fill 3390-9s and -27s with >pagedatasets. > You've been able to allocate a page ds larger than 4G for quite some time now (since z/OS 1.8 + OA20749). On our largest systems, we allocate a single local page dataset per 3390-27 volume. In one of the environments I support I couldn't turn on WLMPAV because much of DASD was shared between 2 sysplexes (via MIM) and that would have led to "PAV thrashing", so I never allocated more than one per volume anyway (except common/plpa). We did have static PAVs for that environment, but ASM ignored that and only reserved the pavs when WLMPAV was set. So it was nice when HIPERPAV came along for that environment. Mark -- Mark Zelden - Zelden Consulting Services - z/OS, OS/390 and MVS mailto:m...@mzelden.com Mark's MVS Utilities: http://www.mzelden.com/mvsutil.html Systems Programming expert at http://expertanswercenter.techtarget.com/ ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: INFO IBM-MAIN
