I also have HP XP20000 disk arrays and am waiting for this to be released. It is my understanding that HP is developing the software for the XPs but I don't have any more info than that. I will post again once I get something from my rep.
I heard it was to release today, Jan 5 2009. But I believe it is being delayed even more.
Rumor is that HP has released it to VMware for testing and the target release is end of the month.
I'm sure that would be the case - SRM needs to work with raid manager to do the horctakeover of the LDEV and change the replication direction. If you have a "main" raid manager server, SRM doesn't need to be on that specifically, just a server that has raid manager installed and a command device LUN.