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esxcli storage core device set -d naa.xxx -r 0 vmkfstools --clearheartbeat /vmfs/devices/disks/naa.xxx:1 When the FDT is lost, files become inaccessible even if data blocks remain intact.
# Reset heartbeat on a single host vmkfstools --repairheartbeat /vmfs/devices/disks/naa.xxx:1 If that fails, forcibly clear reservation and heartbeat: vmfs recover
– bundled with vSphere CLI:
