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Dynamically generate custom vSAN ESA HCL JSON for VMware Cloud Foundation (VCF) 5.1

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I recently shared on how you can deploy the latest VMware Cloud Foundation (VCF) 5.1 release with vSAN Express Storage Architecture (ESA) using Nested ESXi and leveraging a custom vSAN ESA HCL JSON file, which I had created to workaround the required vSAN ESA pre-check during the VCF Bringup process.

I will admit, I actually did not the create the custom vSAN ESA HCL JSON file manually, it was auto-generated using automation 😉

My initial goal was to make it easier for anyone to play with VCF 5.1 using both Nested ESXi as well any physical system that is capable but may is not on the official VMware vSAN ESA HCL. After a lot of trial and error testing with Nested ESXi, I finally had a functional PowerCLI script that can then be used to run against a standalone ESXi host to dynamically generate a compatible custom vSAN ESA HCL JSON file that can then be used with both VCF 5.1 with vSAN ESA or even a standalone vCenter Server deployment for vSAN ESA enablement.

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How to configure VMware Compatibility Guide (VCG) database for vSphere Lifecycle Manager (vLCM) in an air-gapped environment?

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I was setting up another vSphere 8 environment in my homelab using my handy Automated vSphere & vSAN 8 Lab Deployment Script and I was reminded of another vSphere Lifecycle Manager (vLCM) question that I had received during VMware Explore Barcelona 2022.

The question was about configuring vCenter Server that would include full vLCM functionality in an air-gapped environment, where internet connectivity would not be available directly or in-directly through the use of a network proxy. Today, the VMware Compatibility Guide (VCG) database that is integrated with vLCM can only be synchronized when when your vCenter Server is connected to VMware's online repository when VMware's Customer Experience Improvement Program (CEIP) is enabled.


To synchronize the VCG database using the vSphere UI, navigate to the vLCM administrator page and under Actions, select the Sync HCL operation, which will download the latest VCG database from VMware's online repo. You can also automate this using the vLCM REST API with the Update Compatibility Data Task API.

Here is a quick PowerCLI snippet performing the same operation but using the API instead:

Connect-CiSServer -Server vcsa.primp-industries.local -user administrator[at]vsphere[dot]local -Password VMware1!
$hclCompatDataService = Get-CisService -Name com.vmware.esx.hcl.compatibility_data
$hclLastUpdateOnline = $hclCompatDataService.get().updated_at

$hclCompatDataService.'update$task'()

However, for environments that can not connect to VMware's online repo, this poses a big operational challenge, especially for those looking to transition from vSphere Update Manager (VUM) to vLCM. For the vSAN HCL, we already provide a solution for air-gapped environments by providing an offline copy of the vSAN HCL database which detailed in VMware KB 2145116.

If a connected vCenter Server can download the VCG that vLCM uses, I figure it should also be possible to replicate that behavior for an air-gapped environment? 🤔

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New VMware Community HCL

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If you are not using or can not use the official VMware Hardware Compatibility List (HCL) to identify hardware systems and components that are officially supported with a given version of vSphere ESXi, then the experience in finding hardware can be quite daunting for both new and even existing users. Typically, users might start off by searching online or posting in the VMTN Community Forums and although I have attempted to help in this space with my VMware Community Homelab project, which attempts to crowd source working configuration and build-of-materials (BOM) that can assist, it certainly is a big challenge.

Even if you are successful in the initial assessment, there are no guarantees that your hardware configuration will be compatible with future vSphere ESXi releases and the investigative process will likely have to start all over again or simply with trial and error, which can also be frustrating for new users. I have always wanted and I know many of you in the community have also expressed similiar options in having a VMware Community HCL that can be used and maintain by the community.

Today, I am excited to share that we now have a platform that can enable an "unofficial" VMware Community HCL!

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