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Unable to use Snapshots or perform a backup on virtual machines configured with bus-sharing (1006392)

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When working with a combination of Raw Device Mapping (physical or virtual), Microsoft Clustering (MSCS), Snapshots,Consolidated Backup, and/or Data Recovery, you may experience these symptoms:

  • Cannot take a snapshot
  • The snapshot feature does not appear to be available on virtual machines and the option is greyed out
  • When attempting to set a SCSI controller to shared, you may see an error similar to:
Device 'SCSI controller 1' is a SCSI controller engaged in bus-sharing.
  • When attempting to create a snapshot, the operation may fail with the error:
Snapshot creation failed: Virtual machine is configured to use a device that prevents the snapshot operation: Device '' is a SCSI controller engaged in bus-sharing.


Consolidated Backup (VCB), Data Recovery (vDR),  Microsoft Clustering (MSCS), Snapshots, and Raw Device Mappings(RDM) all have their own limitations and requirements that need to be adhered to. The following are a list of requirements:
  • VMware Consolidated Backup requires the use of snapshots to create a backup.
  • VMware Data Recovery requires the use of snapshots to create a backup.
  • Microsoft Cluster nodes that exist across different physical hardware require virtual controllers to be in bus sharing configuration.
  • Snapshots of a Microsoft Cluster node virtual machine using the Microsoft iSCSI Initiator to connect to storage is not supported.
  • Snapshots are not supported on Physical mode Raw Device Mappings.
  • Snapshots are not supported on disks connected to controllers configured for bus-sharing configuration.
Based on the above limitations, we can make the following conclusions:
  • Microsoft Clustering requires bus-sharing and therefore cannot be used in conjunction with use Consolidated Backup, Data Recovery, or Snapshots.
  • Virtual machines with a Raw Device Mapping in physical mode cannot be used in conjunction with use Consolidated Backup, Data Recovery, or Snapshots. 
For more information, see:



If you require bus-sharing:

If you do not require bus-sharing:


cannot-take-snapshot  create-snapshot  create-snapshot-fails

See Also

This Article Replaces

1014311, 1004972, 1013158, 1021679

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