SANrockIT WAN Optimization Appliances

September 22, 2013 

WAN optimization is not something that storage vendors traditionally put into their storage controllers. Storage replication traffic has to fend for itself out in the WAN world, and replication performance will usually suffer unless there are specific WAN optimization devices installed in the network

http://storagebuddhist.wordpress.com/2013/09/22/sanslide-ip-wan-optimization-for-storwize/