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Heads Up – Apple Mac Pro 6,1 fails to boot after upgrading to ESXi 6.7 Update 1

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We had a number of customers report that after upgrading their Apple Mac Pro 6,1 to the latest ESXi 6.7 Update 1 release, the system failed to boot and the following error was seen on the console:

Shutting down firmware services...
Mutiboot buffer is too small.
Unrecoverable error

A few customers made the observation that this was in result of a newer version of the Apple Firmware that was included in the Mac Pro 6,1 systems which seemed to have cause this problem. In addition, this also impacts brand new installations of ESXi 6.7 Update 1 on new Mac Pro 6,1 that includes a newer version of the Firmware. At this time, is it NOT recommended to upgrade to ESXi 6.7 Update 1 if you are running the Mac Pro 6,1. A request has already been made to the VMware HCL team to remove Mac Pro 6,1 for ESXi 6.7 Update 1 and hopefully should be reflected by later this evening.

UPDATE 04/11/19 - This issue has been resolved in vSphere 6.7 Update 2

Note: This issue can also affect the Apple Mac Mini, which is not an officially supported platform for ESXi.

In the mean time, VMware has published KB 59660 which provides a workaround that may help customers who have upgraded their Mac Pro 6,1 to ESXi 6.7 Update 1 to rollback to the previously installed version of ESXi. Please refer to the KB for more details and you can subscribe to the article for future updates regarding this issue.

ESXi on the new 2018 Apple Mac Mini

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Thanks to the Green Mini Host (Apple Mac Mini hosting and collocation provider) who were the first to publicly confirm that latest release of ESXi (6.7 Update 1) works on the recently announced 2018 Apple Mac Mini.

For vSphere/vSAN Home Lab enthusiasts, the price of the new Mac Mini, especially when it is fully loaded is probably a tough sale. However, for customers developing on MacOS including iOS development, CI/CD, build farms, gaming, etc. which benefit from running on vSphere. For these customers, support for ESXi on the new Mac Mini is extremely interesting, especially with the updated hardware giving these systems a significant boost in performance even when comparing to the current Mac Pro 6,1 and iMac Pro models. In fact, I had number of folks ping me after Apple introduced it during their keynote asking if ESXi would work on the Mini's.

UPDATE (06/25/20) - The Apple 2018 Mac Mini 8,1 is now officially on the VMware HCL and is fully supported with ESXi 7.0b, which contains the fixes mentioned above. See note below on 06/23 for more information.

UPDATE (06/23/20) - ESXi 7.0b has just been released and contains fixes for both the MacOS guest boot issue support for Thunderbolt 3 devices which now enables support for the vSphere 7 release. One additional enhancement, customers no longer need to configure the ESXi Advanced Setting to enable Thunderbolt 3 support, this is now automatically configured based on detecting an Apple hardware system such as an Apple Mac Mini 2018 or Apple Mac Pro 2019. This is a patch release and you will need to go to the VMware Patch Portal site to download and apply the update.

UPDATE (04/28/20) - ESXi 6.7 Patch 02 resolves a number of the issues mentioned below, please take a look at this blog post here for more details.

Disclaimer: 2018 Apple Mac Mini are NOT officially supported by VMware. The only officially supported Apple hardware platform is the Mac Pro 6,1 or Mac Pro 5,1 and Mac Mini 6,2 or Mac Mini 7,1. For more details, please refer to VMware's Hardware Compatibility List.

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Retrieving Apple hardware details (Model, Serial, Board & EFI Boot ROM & SMC Version) from ESXi

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For customers who run ESXi on Apple Hardware, retrieving the Apple hardware specific information such as the Board ID, EFI Boot Room and SMC Version for troubleshooting or auditing purposes can be challenging. Historically, this information is only available when running the hardware with an Apple MacOS operating system and customers would have to either boot the system into the MacOS Recovery Mode to run the system profiler tool from the command-line or install a full blown MacOS operating system to retrieve the necessary information as outlined in this Apple KB.

For some customers, this may not even be an option as Apple hardware does not provide any remote management capabilities and customers must physically be in front of the system to perform this process and imagine needing to do this across a fleet of Apple servers. 

While working on a recent case with a customer, I was curious if the Apple specific information could be retrieved from within ESXi and remove the need to boot into MacOS? I reached out to one of the Engineers, Darius Davis, who I work with on a frequent basis when it comes to MacOS-related topics to see if this was possible.

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VMware Fusion Powershell community module

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During the VMware Fusion 2017 Tech Preview, I was experimenting around with the new Fusion REST API and I had built a small prototype PowerShell Module as a way for me to learn how the API works. This allowed me to provide valuable feedback back to the Fusion Engineering team on improving the REST API UX. I was pleasantly happy to see that the majority of the feedback was indeed implemented for Fusion 10 which GA'ed a few weeks back.

Given the PowerShell module was pretty useful for my own use, I figure I would also publish it for others who might also be interested in Automating VM management using the new Fusion REST API, especially those with a PowerShell/PowerCLI background. Another nice thing about the module is that it can run across macOS/Linux via PowerShell Core or Windows using full blown PowerShell. I have been slowly tweaking the module to include the updated REST API changes and I am please to announce that the VMware.Hosted PowerShell Module which supports the new Fusion 10 REST API is now available!

The module includes the following 14 functions:

  • Connect-HostedServer
  • Disconnect-HostedServer
  • Get-HostedNetworks
  • Get-HostedVM
  • Get-HostedVMNic
  • Get-HostedVMSharedFolder
  • New-HostedVM
  • New-HostedVMSharedFolder
  • Remove-HostedVM
  • Remove-HostedVMSharedFolder
  • Resume-HostedVM
  • Start-HostedVM
  • Stop-HostedVM
  • Suspend-HostedVM


If you have ever used PowerCLI before, these functions should feel very familiar. We have basic Connect/Disconnect-HostedServer which will set an environmental variable called $DefaultHostedServer. This variable contains some basic information about the Fusion API endpoint as well as the base64 encoded credentials which are required when connecting to the new Fusion API. Below are a few examples using the new Fusion module, they are pretty basic and I have only implemented a sub-set of the Fusion REST API, so any community contributions are most welcome!

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VMware Fusion 2017 Tech Preview adds REST API support

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In case you have not heard the news, the VMware Fusion and Workstation team just released their 2017 Tech Preview releases which you can read more about it here and here. A couple of years back, VMware had released a slimmed down desktop Hypervisor based on VMware Fusion called AppCatalyst which was optimized for developers wanting to run Docker Containers. Although the feedback for AppCatalyst was positive, the large majority of customers preferred to see the AppCatalyst specific features such as the RESTful API to just be included natively within Fusion rather than having a separate product.

Although it could not be said at the time, the feedback was heard loud and clear and the plan was to pull in the AppCatalyst REST API directly into Fusion. With the Fusion 2017 Tech Preview, you will now be able to interact with your Virtual Machines running on Fusion using the new Fusion REST API which also includes some additional new capabilities that was not there with the AppCatalyst REST APIs such as network and port forwarding management.

UPDATE (09/27/17) - VMware Fusion 10 has just officially GA'ed and there have been number of updates and enhancements since the Tech Preview. From an Automation/API standpoint, there have been several major updates that I would like to call out.

First, there are several new command-linen options to the vmrest utility including support for both HTTP and HTTPS API endpoints, credentials are also now supported so you can setup a shared username/password and ensure that only authorized folks can login to the API and lastly, the default port is now also configurable. Along with these widely requested features during the Tech Preview, there is also a nice debugging option while using the Fusion UI for troubleshooting purposes.

Secondly, the Fusion Swagger REST API docs has received a total re-vamp in terms of organization and cleaned up documentation. Below is a screenshot of the Swagger interface for the GA version of Fusion 10 which should make it even easier to consume the REST API.

Getting Started

Step 1 - Once you have installed the Fusion 2017 TP release, you will need to start the REST API endpoint which is provided by /Applications/VMware Fusion Tech Preview.app/Contents/Public/vmrest You can just type vmrest and it should automatically start or if you prefer to run it in the background, just type the following:

vmrest &

Here is screenshot of starting the Fusion REST API endpoint:


Note: The default port for the REST API is 8697

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Native OVF support for Fusion/Workstation 2017 Tech Preview 

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The VMware Fusion and Workstation team just released their 2017 Tech Preview releases and there is a ton of new and awesome capabilities which you can read more about here and here. One of the exciting new features, which I was very fortunate to have been involved with is finally here, native OVF property support! Although customers have had the ability to import OVF/OVAs for some time now, if they included OVF properties, they would be ignored and often times this would result in a failed deployment as those properties are required for the initial setup.

A great example of this is trying to run the vCenter Server Appliance (VCSA) on either Fusion or Workstation. Today, the only workaround is to manually edit the VMX file and supplying the correct OVF properties which I have blogged about here. With the latest TP release of Fusion/Workstation, when you import an OVF/OVA that contains OVF properties, the UI will automatically render the required information directly into the UI without needing users to manually touch the VMX files.

Here is a screenshot of deploying the latest VCSA 6.5d OVA (jump to bottom for some additional VCSA tidbits when deploying to Fusion/Workstation):

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