Cisco Nexus 1000V and VMware ESX/ESXi Upgrade
Before upgrade check the matrix
This document describes how to upgrade the Cisco Nexus 1000V VEM and VSM software and VMware vCenter and ESX/ESXi software.
http://www.cisco.com/c/dam/en/us/td/docs/Website/datacenter/nexus1000/upgrade/n1kvmatrix.html
Cisco Nexus 1000V Troubleshooting and alerts
http://www.cisco.com/c/en/us/support/switches/nexus-1000v-switch-vmware-vsphere/products-troubleshooting-guides-list.html