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Knowledge Base

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

Last Updated: 3/20/2024Categories: TroubleshootingTotal Views: 33067Language:
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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.

Cause

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 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.

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:

The VMware Consolidated Backup Limitations section of the Virtual Machine Backup Guide.

The Limitations of Raw Device Mapping section of the ESX Configuration Guide.

Resolution

Workaround

If you require bus-sharing:

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.

Related Information

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

Detectable by VMware SkylineTM

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End Of General Availability of the Free vSphere Hypervisor (ESXi 7.x and 8.x) (2107518)

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Download and Install VMware Fusion (2014097)

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