There have been several reports of networking and stability issues on Windows Server 2012 and Windows Server 2012 R2 when deployed on hosts equipped with Emulex NICs. These issues arise when VMQ is enabled. The typical symptoms include the loss of network connectivity on one or more virtual machines or an inability to shut down or power off VMs. Emulex and Microsoft are aware of this issue. Emulex has a fix for the issue and is working internally and with OEM server vendors to make it available to affected customers. You can check the latest status on the Emulex Implementer’s Blog. A detailed description of the issue and workarounds can be found on the Emulex blog site listed below:
Until the Emulex fix is made available the only workaround is to completely disable VMQ on the NIC. In the meantime, if you think you are experiencing this issue Contact Emulex tech support at +1 800-854-7112 or 714-885-3402 or submit a case online at http://www.emulex.com/support/. If you believe that you are experiencing this issue, please be sure that you have updated to the latest Emulex or OEM NIC drivers and firmware and doing a re-assessment before disabling VMQ.