The problem

In my homelab I’m using a server which contains both Gigabit and 10GbE NICs. When I first deployed ESXi version 7.0U1 the list of devices looked like this.

Name    PCI Device    Driver    Admin Status  Link Status  Speed  Duplex  MAC Address         MTU  Description
 ------  ------------  --------  ------------  -----------  -----  ------  -----------------  ----  -----------
 vmnic0  0000:02:00.0  nmlx4_en  Up            Down             0  Half    xx:xx:xx:xx:xx:xx  1500  Mellanox Technologies MT27500 Family [ConnectX-3]
 vmnic1  0000:03:00.0  igbn      Up            Up            1000  Full    xx:xx:xx:xx:xx:xx  2018  Intel Corporation I211 Gigabit Network Connection
 vmnic2  0000:04:00.0  igbn      Up            Down             0  Half    xx:xx:xx:xx:xx:xx  2018  Intel Corporation I211 Gigabit Network Connection

In this system the Mellanox isn’t connected to a switch (yet). So I didn’t notice this straight away. But after I installed some patches the vmnic0 interface didn’t show up anymore. So there is a great KB article from VMware which describes how to determine driver and firmware versions. But in this case the driver wasn’t loaded so most of the commands mentioned in the KB were useless.

This seemed like a good excuse to evaluate Runecast as one of it’s features is to identify installed hardware and the supported driver and firmware versions.

Deploying Runecast

Runecast is one of many companies that provide NFR licences for individuals who are in the VMware vExpert program. Requesting a NFR license was a breeze via this link and after creating a profile I was able to download a virtual appliance in OVA format. I deployed this appliance on my environment and configured it to connect to my vSphere environment.

Identifying NIC details

It didn’t take long before the inventory was collected from vSphere. When I navigated to the ‘HW Compatibility’ feature I could easily check which systems and I/O components are compliant with VMware’s HCL. And sure enough my Mellanox interface did not have a compatible driver installed. A link to the VMware HCL for the specific device is provided which allows you to quickly download the compatible driver for installation.

And it doesn’t stop there. The HW compatibility feature also has a feature to do a ‘what if’ scenario where you can simulate the impact of a vSphere upgrade on your enviroment.

Updating the driver

According to the report from Runecast I simply needed to upgrade my nmlx4 driver to version Now ideally when you have a cluster you can distribute this driver using the Lifecycle Manager. But I only have a single physical host so I needed to use the esxcli command which worked just fine.

[root@esx01:/vmfs/volumes/5fbd8a02-a1c0e492-c0f8-80ee73f0abb5] esxcli software vib install -d /vmfs/volumes/datastore1/
 Installation Result
    Message: The update completed successfully, but the system needs to be rebooted for the changes to be effective.
    Reboot Required: true
    VIBs Installed: MEL_bootbank_nmlx4-core_3.19.70.1-1OEM.670.0.0.8169922, MEL_bootbank_nmlx4-en_3.19.70.1-1OEM.670.0.0.8169922, MEL_bootbank_nmlx4-rdma_3.19.70.1-1OEM.670.0.0.8169922
    VIBs Removed: VMW_bootbank_nmlx4-core_3.19.16.8-2vmw.701.0.0.16850804, VMW_bootbank_nmlx4-en_3.19.16.8-2vmw.701.0.0.16850804, VMW_bootbank_nmlx4-rdma_3.19.16.8-2vmw.701.0.0.16850804
    VIBs Skipped:

And sure enough vmnic0 came back from the dead.


Of course I’m only scratching the surface when it comes to all the features that is on offer with Runecast. But even for a simple issue like identifying an incorrect driver version on a single host homelab Runecast worked amazing.

Rudolf Kleijwegt

I am an experienced IT professional with over 20 years of hands-on experience designing, deploying, and maintaining IT infrastructure in both enterprise and service provider environments. My skills span across Linux and Windows and a multitude of server applications, allowing me to excel in a wide range of IT roles. Currently, my primary focus is on Software Defined DataCenter and DevOps. I am passionate about staying up to date with the latest trends in the industry to achieve superior outcomes.


Leave a Reply

Avatar placeholder

Your email address will not be published. Required fields are marked *