Look for "All Paths Down" or "Permanent Device Loss" in the vSphere client.
vmkfstools -P /vmfs/devices/disks/<device_identifier>
Note: Standard advice is to contact VMware Support before running a vmkfstools creation on a disk with existing data.
Repairing a VMFS datastore is a high-stakes operation. It requires a steady hand, a methodical approach, and a strict adherence to the "Do No Harm" principle. This guide outlines the diagnosis and repair process for the most common VMFS corruption scenarios.