On Tue, 19 May 2009 13:43:20 -0500 "McKown, John" <[email protected]> wrote:
:>I'm reading the paper about IBM's plans for the 64-bit common (HVCOMMON?). And I'm really beginning to wonder about something. What this will do is create another block of storage which is mapped into every address space. I am curious why IBM has not considered using AR mode and a SCOPE=GLOBAL dataspace set up and IPL time, anchored to *MASTER* for some of these data areas. At present, from my reading, there are three ALETs with special values. ALET==0 is for the Primary address space. ALET==1 is for the Secondary address space. And ALET==2 is for the Home address space. How about ALET==3 being for a "common GLOBAL data space"? Is there some reason for products such as DB2, IMS, CICS, MQ, ..., requiring that the "common" area be addressable in "primary" mode at all times? Mainly curious. Is AR mode that much more difficult / restrictive than AMODE(64)? Unless there has been a change, dataspaces are limited to 2G. Takes a lot of dataspaces to map 100G. And one must screw around with a lot of ALETs. But I am glad some people are considering VSCR for 64 bit storage. -- Binyamin Dissen <[email protected]> http://www.dissensoftware.com Director, Dissen Software, Bar & Grill - Israel Should you use the mailblocks package and expect a response from me, you should preauthorize the dissensoftware.com domain. I very rarely bother responding to challenge/response systems, especially those from irresponsible companies. ---------------------------------------------------------------------- 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
