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.
