I would also add that in addition to the active/standby configuration for the vSwitchs, you should also look to use connections from different NIC's... Such as if you have two onboard NIC's, add at least a single dual port (Gb, server class, Intel of course) card and use one of it's connections for the management network configuration and the other for the VM traffic vSwitch... If you have four onboard NIC's already, then I would still add at least a dual (if not quad) port NIC to the host and do the same... If you only have one NIC onboard, then add a pair of dual port NIC's to the host. Basically, build in enough redundancy so that you have NO single point of failure. I do this for every host server I build.
Since I tend to go the route of iSCSI SAN's for my virtual environments, I won't go below six pNIC's inside a host (ports). A happy minimum is really eight ports though (giving enough redundancy to avoid SPoF)... Any more, or ports, beyond that just eliminates (or reduces) potential network performance issues. Especially when the physical switches are properly configured and utilized (also with redundancy)...
VMware VCP4
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