It seems that he ignores a certain necessity in his CA == CP premise. Specifically, that premise is that to achieve CA the system must be a single logical unit.

It seems that he ignores a certain necessity in his CA == CP premise. Specifically, that premise is that to achieve CA the system must be a single logical unit. One the network partitions, anyone in the correct partition (the same one as the CA system) still has access, therefore the system is still available. This sounds bunk, because the system is not available to those on the wrong partition, however, this is not an availability issue, it is a partition issue -- pretty much by definition.