Unable to power on VM failing with "Unable to enumerate all disks."

Products

• VMware vCenter Server

Issue/Introduction

• Unable to power on the vCenter VM from the ESXi host with the error message : 

Unable to power on VM failing with "Unable to enumerate all disks."

• While checking the ESXi host /var/run/log/hostd.log we see entries with respect to No such device (##).

YYYY-MM-DDTHH:MM:SS Er(1#3) Hostd[20###81]: [Originator@6##6 sub=DiskLib opID=esxui-######## sid=######## user=root] DISKLIB-CHAIN : DiskChainOpen: "/vmfs/volumes/Datastore/VM-directory/example_17.vmdk": failed to open: No such device.
YYYY-MM-DDTHH:MM:SS In(1#6) Hostd[20###81]: [Originator@6##6 sub=DiskLib opID=esxui-######## sid=########  user=root] DISKLIB-LIB   : Failed to open '/vmfs/volumes/Datastore/VM-directory/example_17.vmdk' with flags 0x5 No such device (1245193).
YYYY-MM-DDTHH:MM:SS In(1#6) Hostd[20###81]: [Originator@6##6 sub=Libs opID=esxui-######## sid=########  user=root] SNAPSHOT: SnapshotDiskTreeAddDiskHierarchy: Couldn't add disk '/vmfs/volumes/Datastore/VM-directory/example_17.vmdk': No such device (5).
YYYY-MM-DDTHH:MM:SS In(1#6) Hostd[20###81]: [Originator@6##6 sub=Libs opID=esxui-######## sid=######## user=root] VigorOfflineGetAllDisks: Failed to retrieve disk files: No such device

Environment

• VMware vCenter Server 7.x
• VMware vCenter Server 8.x

Cause

The vCenter by default has only 17 hard disks, a new RDM disk was attached from unknown sources to the vCenter VM.

Resolution

• Remove the unknown hard disk from the vCenter VM using the ESXi host UI:
  
  
  • Navigate to the vCenter VM.
    
    
  • Right click >> edit settings >> remove the unknown Hard disk.
    
    
• Power on the VM.