Symptoms
When creating or reverting snapshots, you will see this error message below."There are currently X usable fault domains. The operation requires X more usable fault domains."Example:24-node Cluster with 3 Fault Domains (= 8 Hosts per FD).1.) All Hosts in one Fault Domain are being shut down. 2.) You are trying to revert a Snapshot of one VM and receiving the error message:"An error occurred while reverting to a snapshot: Out of resources. "There are currently 2 usable fault domains. The operation requires 1 more usable fault domains."
Cause
An insufficient number of Fault Domains are currently present in the environment for component placement.
Resolution
Ensure that all configured Fault Domains are online.
Workaround
For vSAN 6.7 onwards the following workaround is available:You can set the advanced config option on all Hosts to be able to create/revert snapshots until the Fault Domain issue has been resolved:esxcfg-advcfg -s 1 /VSAN/ClomForceProvisionPlacementsOnce the Fault Domain issue has been resolved, revert the setting back on all Hosts by:esxcfg-advcfg -s 0 /VSAN/ClomForceProvisionPlacements
