vSAN -- Creating/Reverting Snapshots fails -- Fault Domain Error
Article ID: 326856
Updated On:
Products
VMware vSAN
Issue/Introduction
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."
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."
Environment
VMware vSAN 7.0.x
VMware vSAN 8.0.x
VMware vSAN 6.x
VMware vSAN 8.0.x
VMware vSAN 6.x
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/ClomForceProvisionPlacements
Once the Fault Domain issue has been resolved, revert the setting back on all Hosts by:
esxcfg-advcfg -s 0 /VSAN/ClomForceProvisionPlacements
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/ClomForceProvisionPlacements
Once the Fault Domain issue has been resolved, revert the setting back on all Hosts by:
esxcfg-advcfg -s 0 /VSAN/ClomForceProvisionPlacements
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