Thank you very much Jeff. This is what I was looking for. ____________________________ Jim Hughes 603-271-5586 "There's no sense in being precise when you don't even know what you're talking about." John von Neumann
=>-----Original Message----- =>From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On =>Behalf Of Jeff Gribbin, EDS =>Sent: Thursday, September 13, 2007 2:46 AM =>To: [email protected] =>Subject: Re: Z/VM 5.3 and VTAM and GCS => =>Jim, =>Check out SC24-6098-02 (z/VM Group Control System) Appendix A (Tailoring = => =>and Building the GCS Nucleus) - subsection headed, "Creating a New GCS = => =>Nucleus Build List". Items 7 and 8 at the bottom of page 544 through to = => =>the top of Page 547) are what you need. => =>It's terse to the point of incomprehensibility unless you have prior =>experience of nucleus addressing in a VM context (something which, =>nowadays, fewer and fewer people have need of) but this is definitely =>your, "official reference point". => =>Essentially, what you need to do is to widen the gaps between GCALP and = => =>GCTZET (to expand Low Common Storage), and/or between GCTBHC and GCTEHC = => =>(to expand High Common Storage) by changing / replacing the SLC ("Set =>Location Counter") files referenced by the load list. => =>It's these, "gaps" which define the amount of Low/High Common Storage =>("CSA" in z/OS parlance) available to a particular GCS group and it's thi= =>s =>Common Storage which is used by VTAM (and any other app which needs to = => =>share storage between separate tasks running in the group). As you're =>carrying forward an existing update I'll assume that you can work out how= => =>much increase you need by referring back to your previous system but, if = => =>not, then ask again and maybe somebody a bit more current than I am on = => =>VTAM will be able to offer some pointers. => =>The precise mechanics of WHAT to do are (IMV) fairly well-described in th= =>e =>manual (albeit without any real explanation as to WHY) but if you want to= => =>explore the background to this further - or have other questions - then = => =>please say so and I'll try (no doubt along with others) to expand on the = => =>above and clarify what's going on. => =>Don't forget to put in your notes that the GCS NSS definitions (DEFNSS = => =>stuff) need to be reviewed / adjusted to match with whatever locations ar= =>e =>used by the loadlist or you'll end up building a new nucleus in storage = => =>and then saving the wrong stuff into the NSS - a practice that can be the= => =>source of some serious head-scratching until the penny (dime?) drops ... => =>Regards =>Jeff Gribbin
