Symptoms
This event indicates that a vSAN storage device that backs up the datastores might fail.
Cause
This occurs due to a faulty device firmware, physical media, or storage controller or when certain storage devices are not readable or writable.
Typically, such failures are irreversible. In some instances, permanent data loss might also occur, especially when data is not replicated on other nodes before failure. vSAN automatically recovers data when new devices are added to the storage cluster, unless data lost is permanent.
Resolution
To avoid permanent loss of data due to device failures, you must set the
Number of failures to tolerate policy to greater than zero. For information about setting vSphere admission control policies, see
VSAN and Storage Policy-Based Management. Ensure that you have provisioned the hosts with enough disk space to accommodate any additional requirement for replication.
Please see
https://kb.vmware.com/s/article/2071075 for more information and open a case with support.