We turned 3 - M4000's into the power of of one v445.
We were required to use SAN that is not fully supported by Solaris 10- Eqallogic PS6000.
Our I/O is beyond pathetic. We have latencies of 300ms on the production SAN. We are playing with data links and other things to get around the fact that the iSCSi initiator cannot create mote than four sessions. Our SAN can handle 16 sessions without even breathing hard. There are loads of problems.
I now know more about scsi_vhci than ever before. Wrote some C system code to look at what the driver thinks it has for parms.
One of our M4000 boxes when correctly configured, can do 5-10 times what a v445 can do. Our three boxes together cannot even do that, we are so terribly I/O bound.
Oracle Sun contacted us. They plan on driver enhancements (scsi_vhci).