Can't add a compute server to an existing vSAN cluster via SDDC

Products

• VMware vSAN

Issue/Introduction

When attempting to add a new host to an existing vSAN cluster as a compute only node via SDDC it shows the error:

vSAN Disks Validation on the ESXi Host(s) failed: ESXi Host <Hostname> found zero SSD cache tier

Environment

ESX 8.0U3 

SDDC/VCF

Cause

SDDC is checking for a vSAN cache eligible disk on the host even though a cache disk is not required for a host being added as a compute only node to a vSAN cluster

Resolution

Disable the vSAN disk requirement check from SDDC:

 

1. Snapshot SDDC VM, without memory

 ssh to SDDC as vcf, su to root

2. Add this property to the file /etc/vmware/vcf/domainmanager/application.properties

validation.disable.vsan.disks.check=true

3. Restart domain manager service

systemctl restart domainmanager

4. Start a new add ESX host to cluster workflow with the host in question

5.  After the ESX host is added successfully remove this line again from /etc/vmware/vcf/domainmanager/application.properties

validation.disable.vsan.disks.check=true

 6. Restart domain manager service  

systemctl restart domainmanager