To elaborate a little on what Kris said, the move to 5.2 really improved on the use of storage below the 2G line. It removed most of CP's dependence on low memory addresses. This was a huge relief for many of us who were hogtied by the 2G line. In order to accomplish it, the CP had to become fully 64-bit capable. 5.1's CP is 32 bit. The change in 5.3 removes the last major reliance on low memory; it frees the PGMBKs from 32-bit address dependence. The big step, more like a leap, was from 32 to 64 bit, the move to 5.2. Removing the constraint on where the PGMBKs can be placed is a small step by comparison.
As for gotchas, be sure that your maintenance is current. Our efforts to convert from 4.4 to 5.2 were nothing extraordinary for a migration. The only real problems we had were fixed by the vendors and the PTFs are in the maintenance stream. Since we were fairly early users of VPARS and VTAPE under 5.2, we uncovered some problems there in addition to the ones that were purely IBM. Happily, both vendors, IBM and VSSI, were their usual very responsive selves and the system has been very stable. The Migration Guide is a good place to start when you are looking for incompatibilities. It may even include the caution that Alan mentioned. Regards, Richard Schuh ________________________________ From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Kris Buelens Sent: Friday, July 13, 2007 8:34 AM To: [email protected] Subject: Re: Updating 5.1 to 5.3 z/VM 5.2 changed a lot in its storage management to improve handling real storage above 2GB. Consequently, if you'd have execs that use information from CP control blocks, they may have to be adapted before they can run in z/VM 5.3. With other words: the step from 5.1 to 5.2 is bigger than from 5.2 to 5.3 2007/7/13, Huegel, Thomas <[EMAIL PROTECTED]>: I am going to update from z/VM 5.1 to z/VM 5.3. I was wondering if anyone else has done this, and if there are any 'gotchas'. A more specific question are there any confiq changes in the TCP/IP config file? or can I use my old (5.1) one? The hardware will remain the same z800 until the new z9 arives in September. __________________________________________________________________ << ella for Spam Control >> has removed VSE-List messages and set aside VM-List for me You can use it too - and it's FREE! http://www.ellaforspam.com -- Kris Buelens, IBM Belgium, VM customer support
