I use mule CE 3.3.0. I created cxf proxy service in my mule server. My transaction number is pretty much so I want use the Clustering. Can i install many mule esb instances over severals machines (physical or logical) and connect them together?
From what you're saying in the comments (thank you for providing extra context BTW), it seems you do not need clustering then. You could run the same Mule configuration in different Mule instances and have an HTTP load balancer in front of them.
One thing I forgot to ask is: do you have polling endpoints? If yes, you'll have to start the polling flows only on one Mule instance to prevent multiple pollings of the same data.