Failed to stretch the vSAN cluster with the error “Add more hosts in the spec to meet the required hosts and retry”

Products

• VMware Cloud Foundation

Issue/Introduction

• Failed to stretch the vSAN cluster following document Stretch a vSAN ESA or OSA Cluster Using the SDDC Manager API. The error message is as below
  
  

  Validate Secondary Zone Host Count

  Description
Validate Secondary Zone Host Count

  Progress Messages
The given cluster XXXX is being stretched with X hosts, it should be at least Y hosts required to do the vSAN stretch

  Error
Message: The given cluster XXXX is being stretched with X hosts, it should be at least Y hosts required to do the vSAN stretch
Remediation Message: Please add more hosts in the spec to match the required Y hosts and retry
Reference Token: XXXXXX
Cause: (empty)

Environment

VMware Cloud Foundation 9.0.x

Cause

In a VCF 9.0.x environment, vSAN cluster stretching must be performed via the SDDC Manager API. The operation fails if the number of hosts in the primary availability zone equals that in the secondary availability zone.

Resolution

Add more hosts in the spec to match the number of hosts in primary availability zone.