We have four ESXi 4.1 servers with dual quad core Xeon processors and 96GB of RAM each and 4 NICs. We also have two IBM DS3512 iSCSI SAS storage devices with everything connected with gigabit Ethernet. We have around 15 VMs total spread out on the 4 hosts.

We separated out iSCSI ports on separate vSwitches. Is there a real need to use VLANs as well to separate storage traffic or is that overkill for our small size? I didnt know if it was something you should do no matter what or if it was just for larger environments.