I am aware V-VOLS when created are assigned to a MPB, done in a round robin fashion to balance V-VOL distribution. If you only have 50% of all VSD installed, when you upgrade the round robin continues across all VSD's creating an imbalance. I have manually corrected the situation after the VSD upgrade, to re-balance the V-VOL distribution....I was told an automated "code upgrade" was coming so that this situation would auto re-balance upon installation of additional VSD pairs.......Anyone aware if this is in fact in place? does it require any action during/after the upgrade, special SOM etc? any insight would be appreciated.