vMotion VM with CBT enable disk and disk being in shared multiwriter mode.

Products

• VMware vCenter Server

Issue/Introduction

In vCenter 7, when vMotion a VM configured with a disk with CBT enabled and another disks configured to shared multiwriter mode to another ESXi host, the vMotion wizard shows Compatibility Issues error message of "The operation is not supported on the object. vMotion of a CBT-enabled VM having multi-writer disk(s) is not supported." 

 

Environment

vCenter 7.x

vCenter 8.x

Cause

In vCenter 7, the compatibility check done during the vMotion wizard, checks the VM's disks if Multi-Writer and CBT are being used in any combination on the VM being vMotion and then trigger the compatibility check error message of "The operation is not supported on the object. vMotion of a CBT-enabled VM having multi-writer disk(s) is not supported." 

 

 

Resolution

In vCenter 8, the compatibility check will verify if the VM's disk are configured for CBT and multi-writer on the same disk. If the disk are not, then vMotion wizard panel will show the message Compatibility checks succeeded.

Additional Information

VM with Multi-Writer Disks Failed To Power on from VC after offline Vmotion "The operation is not supported on the object. CBT-enabled VM having multi-writer disk(s) is not supported"

Changed Block Tracking (CBT) on virtual machines

Enabling or disabling simultaneous write protection provided by VMFS using the multi-writer flag

Storage migration of virtual machines with Shared VMDKs