Hi George,
If you are only using z/VM as a hypervisor for Linux guests (or otherwise don't have an active CMS user community) this will work. If you have servers (e.g. DB2, SFS, etc.) and/or end-users that are updating CMS files - you have to keep in mind that those will get out of sync on your 2nd level system right after the spindles are copied. If you have directory maintenance products (e.g. VM:Secure, DIRMAINT,etc.) and/or an ESM (e.g. VM:Secure, RACF, etc.) these products will also get out of sync, so find a way to ensure they stay synchronized between first and 2nd level systems. -Mike From: The IBM z/VM Operating System [mailto:[email protected]] On Behalf Of George Henke/NYLIC Sent: Monday, October 18, 2010 4:53 PM To: [email protected] Subject: *Rolling IPL* Style Migration I have no extra disk, no tape, but still need a fallback, I am thinking of implementing the following strategy to put maintenance into production and would appreciate it, if someone could find something wrong. My 2d Level is a mirror of 1st Level except for VOLSERs which are unique. I apply maintenance to 2d Level. Maintenance hits 5 SDFs, among them, CMS. At cutover: I simply point to the 2d Level RES and IPL it from the HMC. I bring up what was the 1st Level at 2d Level, after making the appropriate VOLSER changes for the 2d Level machine in the 1st Level Directory. I then have my prevous 1st Level machine at 2d Level as a fallback, if need be. When I am ready to install a new version or put on more maintenance,, I DDR the 1st Level disks to the 2d Level, and bgin the process all over again. Aside from losing the 1st Level Spool files whenever I do this, I see no other problem. I suppose I could always connect the 2d Level and 1st Level Spools with RSCS so I do not have that problem. I could also use Dave Jones, *handy dandy* SFB utility to copy the Spool files to CMS and then restore them to the new 1st Level system. But aside from this weakness, I see no other reason why this should not work. Please, someone, let me know if you do.
