Migrate a VCF Hybrid vSAN Cluster to an All-Flash vSAN Cluster

Two weeks ago I published an article describing how to Migrate a Hybrid vSAN Cluster to an All-Flash vSAN Cluster. I received many positive comments on the article, thanks for that! And a few good questions too, one of those questions stood out because it was asked multiple times. The question was “How does this process look like if we want to migrate a VCF Hybrid vSAN Cluster to an All-Flash vSAN Cluster?”.

Migrate a VCF Hybrid vSAN Cluster to an All-Flash vSAN Cluster

Well that’s a good question and just like in the previous article I had no experience with this myself. And the VMware Cloud Foundation documentation (link) only describes the commissioning (link) and decommissioning of hosts (link). But it does not describe the procedure for replacing the Hybrid vSAN hosts in a, VCF managed, vSAN enabled cluster by All-Flash vSAN hosts. But even if the procedure would have been described in the documentation, I want to gain experience with this myself as well. Not from a theoretical standpoint (as it should work) but more from a practical standpoint as I also want to understand what the impact would be for the running workloads when you perform this action. Especially because we might need to perform this procedure on a VCF Hybrid vSAN Cluster in the Management Workload Domain of a VMware Cloud Foundation deployment. So, this article isn’t only to check the procedure. But also to check if there isn’t any impact on the workloads running on the VCF Hybrid vSAN Cluster where we want to perform the life cycle of the hosts!

So here we go again, TO THE LAB!

Lab Setup

  • Software used
    • VCF 4.1
    • vCenter 7.0 u1
    • vSphere 7.0 u1
    • vSAN 7.0 u1
  • Hosts – Hybrid – 1x 48GB Cache SSD 3x 48GB Capacity HDD
    • esxi-1.vrack.vsphere.local
    • esxi-2.vrack.vsphere.local
    • esxi-3.vrack.vsphere.local
    • esxi-4.vrack.vsphere.local
  • Hosts – All-Flash – 1x 48GB Cache SSD 3x 48GB Capacity SSD
    • esxi-5.vrack.vsphere.local
    • esxi-6.vrack.vsphere.local
    • esxi-7.vrack.vsphere.local
    • esxi-8.vrack.vsphere.local

Let’s get started

I’ve prepared VCF Management Workload Domain Cluster “SDDC-Cluster1” with the 4 Hybrid hosts and made sure the vSphere and vSAN Cluster status was in a healthy state.

Within the vSphere Client under Configure -> vSAN -> Disk Management the vSAN Disk Groups are shown. Also in the column “Type” you can see that the vSAN Disk Groups of the VCF Management vSAN Cluster are of the type Hybrid.
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