IBM Mainframe Discussion List <[email protected]> wrote on 06/20/2007 12:28:12 AM:
> -- snip -- > When we upgraded to the z9 from a z800, the biggest shock was HSA. 1.4 Gig > for HSA and no warning it would be that bad ??? I read about its impact, > but > never imagined it would be so much. Wiped out a whole LPAR I had planned. > > I concentrated on reviewing a paper called "Moving to fewer and faster > CPU's" > (or something like that) when we originally went to the z800. That has a > good > discussion of the concerns at a level my simple mind can understand. I just > wanted to ensure I didn't short something I cared a lot about. > > All-in-all, our upgrade went well. I'm still learning to optimize the > configuration, > but you'll be able to hide most of your transgressions behind the increased > performance. Moving from the z890, you won't have major conversion > concerns either. Considering the jump you're making, happiness will abound. > -- snip -- > > Dave, > > one of the things I almost always forget to check on is whether the > increase in real storage that the LPAR sees will result in MVS re-aligning > its virtual boundries. Prior to z/Architecture, MVS mapped the Page Frame Table virtual storage as part of the Read/Write Nucleus, so changing the amount of real storage in the zone did affect the upper boundary of the nucleus, and thus everything else above 16MB. In z/Architecture, MVS maps the Page Frame Table virtual storage in a data space, so you should no longer see this effect. Jim Mulder z/OS System Test IBM Corp. Poughkeepsie, NY ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
