All vSAN Objects Appear in Reduced Availability State After Configuring Fault Domains in a vSAN-Enabled Cluster

Products

• VMware vSAN

Issue/Introduction

Symptoms:

• Creating fault domains in a vSAN cluster results in vSAN objects being reported in a Reduced Availability state within the vSAN Health Service and Object view.

         

• VM creation fails with the error: "Cannot complete file creation operation" due to insufficient usable fault domains and police compliance issues .

         

Environment

• VMware vSAN 7.x
• VMware vSAN 8.x

Cause

• The ClomRaidECReconfigureDelaySec parameter is set to a default value of 86400 seconds (24 hours). After configuring fault domains, vSAN delays the reconfiguration of objects to comply with the new fault domain layout. As a result, objects may appear in a Reduced Availability state until the 24-hour delay period elapses.
• To check the current value of ClomRaidECReconfigureDelaySec, use the following command .   
• esxcfg-advcfg -g /VSAN/ClomRaidECReconfigureDelaySec

Resolution

• vSAN requires up to 24 hours after configuring fault domains to complete the reconfiguration of objects in accordance with the updated fault domain topology. During this period, objects may be reported in a Reduced Availability state. This is expected behavior, and objects will return to a compliant state once the reconfiguration process is finalized.
• As a workaround, you can reduce the ClomRaidECReconfigureDelaySec value to less than 24 hours to accelerate object compliance based on your specific requirements.
• esxcfg-advcfg -s <time_in_sec> /VSAN/ClomRaidECReconfigureDelaySec