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Search Results for: NUC

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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Video of ESXi install workaround for Fatal CPU mismatch on feature for Intel 12th Gen CPUs and newer

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I have been noticing more and more users that have acquired hardware that includes the latest Intel 12th Generation CPU (Alder Lake) and even the newest Intel 13th Generation CPU (Raptor Lake) for use with ESXi. Starting with the Intel 12th Generation CPU, Intel has introduced a new hybrid "big.LITTLE" CPU architecture that integrates two types of CPU cores: Performance-cores (P-cores) and Efficiency-cores (E-cores) into the same physical CPU die.

ESXi is currently not aware of this new consumer architecture and it currently expects all cores within a CPU package to have uniform characteristics. If you boot the ESXi installer, it will PSOD (Purple Screen of Death) by default and you will see a message about "Fatal CPU mismatch on feature" which is due to the different CPU properties across both the P-Cores and E-Cores. However, there is a way to workaround the issue by disabling the CPU uniformity check that ESXi performs as part of its boot up.

UPDATE (01/16/24) - See this blog post on some updated experiments using CPU affinity when both E-Cores and P-Cores are enabled when using ESXi.

UPDATE (04/22/23) - If you decide NOT to disable either E-Cores or P-Cores, you may also run into an additional PSOD when powering on a VM with GP exception in world message. To workaround this problem, please see this blog post HERE.

UPDATE (03/24/23) - It is possible and recommended to actually disable the E-cores within the Intel NUC BIOs following the instructions HERE to prevent ESXi from PSOD'ing due to non-uniform CPU cores rather than applying the ESXi boot option workaround as described in the video below.

I initially wrote about the solution back in Feb of 2022 where this new CPU was first introduced in the Intel NUC line with the Intel NUC 12 Extreme (Dragon Canyon) and subsequently, I had also wrote about the solution reviewing both the Intel NUC 12 Pro (Wall Street Canyon) and the Intel NUC 12 Enthusiast (Serpent Canyon).

While the majority of folks have not had any issues applying the workaround, I have started seeing some folks running into challenges, perhaps its familiarity with ESXi or applying kernel options. In any case, I figured it might help to record a video demonstrating the workaround for those that rather visualize the solution along with the written instructions (included below).

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