[VMC] Snapshot creation fails with error "Object policy is not compatible with datastore space efficiency policy configured on the cluster"
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Article ID: 414528
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Updated On:
Products
VMware Cloud on AWS
Issue/Introduction
Snapshot creations during VM backup fails with the below error:
Object policy is not compatible with datastore space efficiency policy configured on the cluster. An error occurred while taking a snapshot: 22 (Invalid argument).
VM Power On operation fail with error:
Module VMMon power on failed. Failed to start the virtual machine. Failed to power on VM. Could not power on virtual machine: Failure. Failed to create swap file
vMotion of the VM fails with error:
A general system error occurred: Launch failure 2025-10-14T03:22:19.970158Z The VM failed to resume on the destination during early power on. Module VMMon power on failed. Cause: Module VMMon power on failed. 2025-10-14T03:22:19.970158Z The VM failed to resume on the destination during early power on.
The issue started after a new ESXi host was added to the Cluster during a planned maintenance or after an unplanned host failure.
Environment
VMware Cloud on AWS
Cause
This is a known issue caused by a race condition in the vSAN clomd module, when the vSAN Witness host's disks are marked as having Deduplication Disabled but not tagged as Witness disks which do not store data.
Due to the vSAN Storage Policy having "Space efficiency" set to "Deduplication and Compression", the incompatibility error is thrown and vswp file creation fails.
Resolution
Restarting vSAN CLOMD service on all hosts in the Cluster is a valid work-around. To perform this action on a VMC on AWS SDDC environment, please engage VMC on AWS Support.
A permanent fix would be available in a future version.