Here's a quick tip.....

There are a few caveats to the <a href="http://www.cisco.com/en/US/products/ps9902/index.html" target="_blank">Nexus 1000v</a> virtual switch from <a href="http://www.cisco.com/" target="_blank">Cisco</a>, but I ran into a new one when dealing with an iSCSI environement.

After implementing the 1000v, I found that I lost all connectivity to the <a href="http://www.emc.com/" target="_blank">EMC</a> array.  I checked all the settings on the array and even deregistered the connections to the host.

The host connection status would show connected, but not logged in. Strange...

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I bounced around the Nexus configuration and vCenter's settings, to no avail.  Finally, I started from scratch and rebuilt the connections in vCenter to the iSCSI array....still no dice.

Here is the fix...

Believe it or not changing the settings for the iSCSI adapter in vCenter from dynamic to static fixed the problem.  Gratned you have to enter a few more lines of information from the array to get the connections setup, but it in fact fixed the problem.  If I removed the static entries, and attempted to reconnect to the array via the dynamic discovery, I lost connection again.

So, the conclusion is, when dealing with the Nexus 1000v, use static discovery in vCenter to connect to iSCSI.