Yellow Bricks

by Duncan Epping

vmware cloud foundation

#109 – Introducing Virtual Private Cloud (VPC) featuring Yves Hertoghs

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VMware Cloud Foundation 9 has brought the ⁠Virtual Private Cloud networking model⁠ front and center in the vSphere UI. Not only has it become extremely easy to provide a self-service solution for networking, but it also comes with a plethora of networking services and capabilities. Maybe even more importantly, it allows networking-noobs (like myself) to consume advanced functionality without having to file dozens of service requests. In this episode, Yves Hertoghs explains what a Virtual Private Cloud is and discusses all the ins and outs around the Transit Gateway, vDefend, subnets, and much more.

You can listen to the episode on Spotify (bit.ly/3MArJs9), Apple Podcasts (bit.ly/3YtUhWQ), or online via the embedded player below.

If you like to learn more about VPCs, make sure to read the various blogs, and watch the various Explore sessions on the topic. There’s plenty out there to dive straight into it!

Plenty of things to read and watch during the upcoming holiday season, I am going to take a short break as well, but I will be back in January for sure! Enjoy,

What do I do after a vSAN Stretched Cluster Site Takeover?

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Over the last couple of months, various new vSAN features were announced. Two of those features are around the Stretched Cluster configuration, and have probably been the number 1 feature request for a few years. Now that we have Site Takeover and Site Maintenance functionality available, I am starting to get some questions about the impact of them, and in particular, the Site Takeover functionality is raising some questions.

For those who don’t know what these features are, let me describe them briefly:

Site Maintenance = The ability to place a full vSAN stretched cluster Fault Domain into maintenance mode at once. This ensures that all hosts within the fault domain have consistently stored the data, and all hosts will go into maintenance mode at the same time.

Site Takeover = This provides the ability when a Witness and a Data Site has failed to bring back the remaining site through a command line interface. This will reconstruct the remaining “site local” RAID configuration, making the objects available again, which will then allow vSphere HA to restart the VMs.

Now, the question that the above typically raises is what happens to the Witness and the Data Site that failed when you do the Site Takeover? If you look at the VMs RAID configuration, you will notice that both the Witness and the Data Site components of the sites that failed will completely disappear from the RAID configuration.

But what do you do next, because even after you run the Site Takeover, you still see your hosts and the witness in vCenter Server, and you still see a stretched cluster configuration in the UI. Now at first I thought that if the environment was completely up and running again, you had to go through some manual effort to reconstruct the stretched cluster. Basically, remove the failed hosts, wipe the disks, and recreate the stretched cluster. This is, however, not the case.

In the example above, if the Preferred site and the Witness site return for duty, vSAN will automatically discard the stale components in those previously failed sites. It will recreate new components for all objects, and it will do a full resync of the data.

If you end up in a situation where your hosts are completely gone (let’s say as a result of a fire), then you will have to do some kind of manual cleanup as follows, before you rebuild and add hosts back:

  • Remove the failed hosts from the vCenter inventory
  • Remove the witness from the vCenter inventory
    • Delete the witness from the vCenter Server it is running, a real delete!
  • Delete the surviving Fault Domain, this should be the only Fault Domain still listed in the vCenter interface
  • You now have a normal cluster again
  • Rebuild hosts and recreate the stretched cluster

I hope that helps,

#097 – Running AI/ML workloads on top of VMware Cloud Foundation featuring Frank Denneman

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I recently read a blog post on AI/ML performance on top of VCF, and figured it was time to invite Frank Denneman back to the podcast. During the episode we discuss VMware Private AI Foundation with NVIDIA, and Frank mentioned Ollama as a great starting point for those who want to explore the AI/ML world. I also thought the use cases for AI/ML Frank shared were very interesting. Check it out now!

Unexplored Territory #092 – Introducing DSM 2.2 featuring Cormac Hogan!

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Recently Data Services Manager 2.2 was released, so it was time for me to ask my friend Cormac Hogan back on the show to share with us what was introduced. Although it was just a “minor” release, there were some major announcements, of which the S3 Object Storage capabilities are probably what will excite you the most! Make sure to listen to the episode either via the player below or on your favorite podcast app. (Spotify, Apple, etc)

Unexplored Territory Episode 088 – Stretching VMware Cloud Foundation featuring Paudie O’Riordan

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The first episode of 2025 features one of my favorite colleagues, Paudie O’Riordan. Paudie works for the same team as I do, and although we’ve both roamed around a lot, somehow we always ended up either in the same team, or in very close proximity. Paudie is a storage guru, and the last years helped many customers with their VCF (or vSAN) proof of concept, and on top of that helped countless customers understand difficult failure scenarios in a stretched environment when things went south. In Episode 088 Paudie discusses the many dos and don’ts! This is an episode you need cannot miss out on!