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Can I assign individual ports on a single adapter to different vSwitches? In other words can I assign 2 ports for SAN and 2 ports for LAN on a 4 port nic?

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Yes, you can. Each port can be assigned via the adapter dialog in the vSwitch configuration screen. This is a standard task...

Here's an example with a 4-port Intel card:

In the "Network Adapters" configuration page, the four vmnicX devices show up with their link and speed status.

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In the vSwitch configuration, the "Physical Adapters" shows which vmnics are assigned to which switch. I don't have any assigned to the storage network defined below, but I could easily add one.

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In the vSwitch properties page, you can add adapters listed as "unclaimed adapters" to a particular vSwitch. In your case, add two to your Virtual Machine network vSwitch and add two to your storage vSwitch.

enter image description here

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It appears as one nic. I can't seem to add each port to a different vSwitch. What am I doing wrong? –  Luke Jun 29 '12 at 23:06
    
See the edits with examples. –  ewwhite Jun 30 '12 at 15:56
    
Thanks! It seems that my motherboard has independent chipsets for each port. For some reason each is different, and one of them isn't supported by ESXi out of the box. –  Luke Jul 3 '12 at 23:57

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