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How to bootstrap ESXi compute only node and connect to vSAN HCI Mesh?

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After documenting the process for bootstrapping vSAN Express Storage Architecture (ESA) using my Intel NUC 12 Pro, I was looking for an easier way to share my physical vSAN storage, which is powered by a single Supermicro E200-8D, to other physical ESXi hosts for testing purposes.

I had recently been playing with the vSAN HCI Mesh feature, which was launched back in 2020, as I was running out of spare NVMe devices when needing to test different physical hardware kits. While my use case for the storage is typically short lived, it means I do not have to play musical chairs with the limited number of NVMe devices I have installed in the various kits I have.

The vSphere UI in vCenter Server already provides a very simple workflow to mount a remote vSAN storage on an ESXi compute-only node, but I was also looking at this from a bootstrapping point of view and what if vCenter Server was not deployed or even available? Could I still make this work? After a bit of trial and error, I was able to figure out this can be accomplished by using a series of ESXCLI commands!

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How to bootstrap vSAN Express Storage Architecture (ESA) on unsupported hardware?

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I was recently chatting with a fellow colleague who asked an interesting question about the memory overhead between running vSAN Original Storage Architecture (OSA) versus the new vSAN Express Storage Architecture (ESA) from a VMware Homelab perspective. I honestly did not know the answer as I am only using vSAN OSA for my personal homelab. I was curious myself, especially its implicationn on small form factor (SFF) systems which typically max at out 64GB of memory.

Today, vSAN ESA is only officially supported when using vSAN ESA Ready Nodes which are all listed in the vSAN ESA HCL and the minimum amount of memory is 512GB. For the best possible experience and supported configurations, customers should only use approved vSAN ESA hardware and the use of any other systems will not yield the same benefits nor outcomes. As an aside, a fantastic resource for all things vSAN ESA can be found on the vSAN ESA TechZone page, which I highly recommend bookmarking as there is a lot of in-depth technical resources and collateral.

Disclaimer: This is not officially supported by VMware and is purely for educational purposes, use at your own risk.

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How to recover ESXi installed on USB device after disabling vmkusb module?

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I have to say, this is one of the more interesting challenges that I have come across in quite some time. A user was looking for assistance after they accidentally disabled the vmkusb module, which is the USB driver for ESXi and allows it to communicate with USB devices that are connected to the system.

The vmkusb module also plays a very critical role if you have ESXi installed on a USB device, as the driver is required for proper functionality such as being able to save the ESXi state and configurations to the USB device. So what happens when you disable the vmkusb module and you reboot the ESXi host, which is also installed on a USB device?

Well, everything continues to work including VMs since ESXi by design runs in memory after the initial boot from the USB device. However, any configuration changes made after that is lost after a system reboot including the attempt to re-enable the vmkusb module since ESXi is unable save any of the settings to the USB device. Fortunately, I was able to help the user out as I had a few ideas on how we could fully recover from this type of scenario and hence the blog post.

Hopefully a lesson can be learned here, do not make changes or disable things that you are not familiar with 🙂

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