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What Host Lifecycle Operations Are Available after Importing vCenter into VCF 9.x Fleet?

06.24.2026 by William Lam // Leave a Comment

VMware Cloud Foundation (VCF) first introduced the Brownfield Import capability in VCF 5.2, making it easy for customers to onboard their existing vSphere environments into a VCF deployment. While the Brownfield Import capability had some limitations in earlier releases, it has seen significant enhancements since VCF 9.0 and now provides a native onboarding experience using either the VCF Installer or as a Day-N operation within VCF Operations.

While some customers may have the opportunity to deploy a brand new VCF 9.1 Fleet as part of a hardware refresh initiative, the vast majority will start by converting an existing vSphere environment into their initial VCF Management Domain and then import their remaining vSphere environments as VCF Workload Domains.

In addition to providing centralized visibility and lifecycle management (patching and upgrades) for imported environments, one of the most common question is around what host lifecycle operations can be performed after an environment has been imported into VCF.

[Read more...]

Categories // VMware Cloud Foundation Tags // VCF 9.0, VCF 9.1

Clarifying Minimum Required ESX Hosts for VCF Deployments

06.18.2026 by William Lam // Leave a Comment

The VMware Cloud Foundation (VCF) 9.x Installer includes a built-in resource calculator that automatically determines the required compute and storage resources, along with the estimated number of ESX hosts needed to support the selected deployment configuration.


Understanding the compute and storage requirements is fairly straightforward, but the minimum number of ESX hosts required for a deployment is not always as clear, especially when factoring in the different supported principal storage types (vSAN, NFS and VMFS on Fibre Channel).

[Read more...]

Categories // VMware Cloud Foundation Tags // VCF 9.0, VCF 9.1

Quick Tip: High CPU Utilization on ESX due to Slow Entropy from AMD Zen 4 CPUs

04.29.2026 by William Lam // 3 Comments

I had been troubleshooting a stubborn CPU utilization issue with a workload that, over time would also overrun the CPU on my physical ESX host. The assumption was that the workload was causing the issue, but after several rounds of collecting various ESX performance statistics, there was nothing conclusive that the workload was the culprit.

An interesting observation from some of the ESXi VMkernel Engineering team was that my VMkernel log contained a large number entropy errors:

NRandomHwrng: 246: Out of entropy, refreshing

The engineering team suspected that these entropy issues could actually be the root cause of the issues I had observed, especially as they have seen something simliar in another case when entropy requests fail.

[Read more...]

Categories // ESXi, VMware Cloud Foundation Tags // Minisforum, VCF 9.0

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William is Distinguished Platform Engineering Architect in the VMware Cloud Foundation (VCF) Division at Broadcom. His primary focus is helping customers and partners build, run and operate a modern Private Cloud using the VMware Cloud Foundation (VCF) platform.

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Recent

  • Quick Tip: How to Identify Which Kubernetes Cluster Owns a vSphere Container Volume (PV) 06/25/2026
  • What Host Lifecycle Operations Are Available after Importing vCenter into VCF 9.x Fleet? 06/24/2026
  • VCF 9.1 - Enabling High Availability for a Small VCF Management Services (VCFMS) Deployment 06/22/2026
  • Clarifying Minimum Required ESX Hosts for VCF Deployments 06/18/2026
  • VCF 9.1 - Auditing VCF Management Services (VCFMS) IP Pool UsageĀ  06/17/2026
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