I am trying to compare VMware's new VSA with the HP LeftHand VSA. Both products allow you to run the SAN node as a VM. Reading VMware's documentation I get the impression that VMs on the same host as the SAN node access data from that node at local storage speeds, while I get the impression with HP's VSA that it presents as iSCSI and thereby subject to that slow down.
I like the HP VSA because it would allow us more than 3 nodes and it allows the migration to hardware based SAN or even mixed hardware and VM based nodes, but if I am understanding the performance difference with VMware's product I would consider that a greater value and worth the 3-node limit.
My question is with HP LeftHand VSA, since you configure targeting the cluster and not the node, will it not be able to bi-pass the artificial performance ceiling of the virtualized switch and NIC in the communication chain between the local VM and local virtual SAN node?