Symptoms:

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. 

VMware ESX 4.1.x
VMware vCenter Server 4.1.x
VMware ESX Server 3.5.x
VMware vCenter Server 5.1.x
VMware ESXi 4.1.x Embedded
VMware vCenter Server 6.7.x
VMware vCenter Server 4.0.x
VMware vCenter Server 5.0.x
VMware VirtualCenter 2.5.x
VMware vSphere ESXi 5.0
VMware vSphere ESXi 5.5
VMware vSphere ESXi 6.5
VMware ESXi 3.5.x Installable
VMware vSphere ESXi 6.7
VMware ESXi 4.1.x Installable
VMware ESXi 3.5.x Embedded
VMware ESXi 4.0.x Installable
VMware vCenter Server 6.0.x
VMware ESX 4.0.x
VMware vCenter Server 6.5.x
VMware vSphere ESXi 6.0
VMware vCenter Server 5.5.x
VMware ESXi 4.0.x Embedded
VMware vSphere ESXi 5.1

• 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 as there is no connectivity with which to create said snapshot on such a disk.
• Snapshots are not supported on Physical mode Raw Device Mappings.
• Snapshots are not supported on disks connected to controllers configured for bus-sharing configuration.

• 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.

• The VMware Consolidated Backup Limitations section of the Virtual Machine Backup Guide.
• The Limitations of Raw Device Mapping section of the ESX Configuration Guide.

Workaround

• Consider running backup software within your guest operating system as an alternative solution.
• If your virtual machine currently has snapshots and it is preventing you from configuring bus-sharing, delete the snapshots. For more information, see the Using Snapshots section of the vSphere Basic Administration Guide for your version of VMware ESX.
  
  Note: If snapshot consolidation fails, see Consolidating Snapshots(1007849).

If you do not require bus-sharing:

• If your virtual machine is currently configured with bus-sharing, but you want to create snapshot, you must disable bus-sharing. For more information, see the Managing Mapped LUNs section of the ESX Configuration Guide for your version of VMware ESX.

Consolidating snapshots in ESX/ESXi 3.x and 4.x
バスの共有で構成されている仮想マシンでスナップショットを使用したり、バックアップを実行できない
无法在已配置总线共享的虚拟机上使用快照或执行备份