Correct, GCM will not be necessary in this circumstance. I am not aware of any limitations regarding odd-cyl-sized VMAX3/AF volumes at this time.
Hello Experts,  Had a quick sanity check needed on setting up SRDF between V2 and V3 arrays. The source devices are all even cylinder (355150 for example). However when they have the targets created on the V3 for migration, they will be odd cylinder (172075 for example). I don't believe GCM will be set at all in this case since the source is not odd cylinders, but it leaves the targets as odd cylinders for the future, which I have never liked. Is the only restriction here with odd cylinders on the target with RecoverPoint? I have been trying to find any limitations leaving them as odd cylinders on the target, but can't find much so was curious if anyone ran into this before and maybe I just hadn't come across the right documents yet.  thanks!
GCM Sanity Check on SRDF Migration between V2 and V3