can I increase a volume size without stoping replication?

[r3vo]

Maybe you have to "uncheck" the "checkbox" for replication of the logical volume?
I don't know exactly if that causes the troubles, but im sure that you have to uncheck the checkbox for replication of the volume, if e.g. you want to delete the LV.

[macpro]

Thanks. Tried that on a non critical volume and then I was able to change the volume size.