Hyper-V backups of Virtual Machines with pass through disks fail with error message

Problem

Hyper-V backups of Virtual Machines with pass through disks will show the error message "One or more virtual machines have been excluded from the backup as the the virtual machine uses one or more physical disks. Use the Backup Exec Remote Agent on the virtual machine for backup and restore operations."

Error Message

0xa0009644 - One or more virtual machines have been excluded from the backup as the the virtual machine uses one or more physical disks. Use the Backup Exec Remote Agent on the virtual machine for backup and restore operations. 

For additional information regarding this error refer to link V-79-40960-38468

Cause

Pass Through Disk in Hyper-V : Hyper-V allows virtual machines to access storage mapped directly to the Hyper-V server without requiring the volume be configured. The storage can either be a physical disk internal to the Hyper-V server or it can be a Storage Area Network (SAN) Logical Unit (LUN) mapped to the Hyper-V server. To ensure the Guest has exclusive access to the storage, it must be placed in an Offline state from the Hyper-V server perspective. Additionally, this raw piece of storage is not limited in size so, hypothetically, it can be a multi-terabyte LUN.
 

Solution

 
Backup the Virtual Machine using (RAWS) Remote Agent for Windows Server. Guest Virtual Machines that have both a Virtual Disk (VHD) and a Physical (PassThrough) disk will be excluded from the backup as the virtual machine uses one or more physical disks.  Use the Backup Exec Remote Agent on the virtual machine for backup and restore operations.
 
As per the SCL (Software Compatibility List) the Pass Through is not supported if:
  • Physical(Pass Through) DAS or SAN on the Host directly attached to the Guest
  • Physical (Pass Through) RDAS on the Host directly attached to Guest
  • Guest Disk attached via SAN(iSCSI initiator)
 

 
 

 

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