A 16-node vSAN cluster has been deployed in a primary data center. All virtual machines are assigned a storage policy containing the rule Primary level of failures to tolerate = 1. A storage controller in one of the nodes produces several errors and eventually suffers a permanent failure.
How does vSAN handle this issue?
A. All components on the drives attached to the failed storage controller are marked "Stale". An administrator must log into the vSphere Web Client and click the Repair Objects Immediately button to restore redundancy.
B. All components on the drives attached to the failed storage controller are marked "Stale". vSAN starts rebuilding the affected components on other healthy drives in the vSAN cluster after 60 minutes have elapsed.
C. All components on the drives attached to the failed storage controller are marked "Absent". vSAN starts rebuilding the affected components on other healthy drives in the vSAN cluster after the affected host is put into maintenance node.
D. All components on the drives attached to the failed storage controller are marked "Degraded". vSAN immediately starts rebuilding the affected components on other healthy drives in the vSAN cluster.
Correct Answer: D
https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.virtualsan.doc/GUID-3863B640-3449-46A2-84E0-AC07E5A604FD.html
Degraded
A component is in degraded state if vSAN detects a permanent component failure and assumes that the component is not going to recover to working state.
vSAN starts rebuilding the affected components immediately.