There is once a time that I was tasked to downgrade vxvm from 5.0 to 4.1, after the downgrade, all dgs are unable to import with some invalid configuration. After gone through all the relevant document, I couldn't fnd any references. After open a case with symantec, I got the finial confirmation this is not supported and data backup & restore must follow the downgrade of binary vxvm software.
Having said that, my task was still there, without being supported, I still need to action this task and after several tests, it went through. Pls note, this is NOT supported by symantec and you should NOT try this on production environment with proper backup in place. Make a backup either from application level like file system level, or from lower level like disk level with such as EMC bcv etc etc.
Ok, let's walk through the procedure and you might provide a better sub steps, if so, pls contribute to this community to...