VCHA creation fails with error 'having disks on more than one datastore'

Products

• VMware vCenter Server

Issue/Introduction

• Enabling vCenter High Availability(VCHA) on a vCenter server after patching fails with an error, even when the vCenter server virtual machine resides on a single datastore.
  
  The operation is not allowed in current state vCenter HA does not support an Active mode having disks on more than one datastore.
  
  
• vCenter VM vmware.log shows an ISO image mounted from a separate datastore prior to snapshot creation on the vCenter server virtual machine.
  
  vmx - CDROM: Connecting ide0:0 to '/vmfs/volumes/####/VMWARE/VMware-vCenter-Server-Appliance-####-patch-FP.iso'. type=2 remote=0
SnapshotVMX_TakeSnapshot start: 'VM Snapshot #/#/####', deviceState=1, lazy=1, quiesced=0, forceNative=0, tryNative=1, saveAllocMaps=0

Environment

VMware vCenter Server 8.x

Cause

The vCenter server virtual machine contains a snapshot created while an ISO image from another datastore was mounted, causing VCHA validation to detect multi-datastore dependencies.

Resolution

To resolve this issue, disconnect all attached ISO files and delete all existing snapshots on the vCenter server virtual machine.

1. Log in to the vSphere Client using vCenter server SSO administrator credentials.

2. Disconnect all mounted ISO files from the vCenter server virtual machine.

3. Delete all existing snapshots on the vCenter server virtual machine.

4. Retry the VCHA configuration process.