The problem may be one of the following:

• The problem may involve a virtual disk that is configured for Logical Disk Manager (LDM) volumes.

  See LDM volumes and status code 1.

• A snapshot of the virtual machine (*.avhd or *.avhdx file) was created while the backup was in progress.

  See Hyper-V snapshots (avhd or avhdx files) and status code 1.

• The virtual machine is configured with pass-through disks. NetBackup for Hyper-V does not back up pass-through disks. If all of the virtual machine's disks are pass-through, note: Only the configuration files (such as XML, bin, vsv) that represent the virtual machine are backed up.

  To back up pass-through disks, see the following:

  See About Hyper-V pass-through disks with NetBackup.

The problem may be one of the following:

• The NetBackup primary server cannot communicate with the virtual machine.

• The host name of the virtual machine is not available.

  The NetBackup job details log contains the following message:

  Error bpbrm(pid=8072) Nameuse [0], VM [<vm name>]
  not found on any node. Is either powered off or does 
  not exist.

  The virtual machine is either not running, or it is starting up. Make sure that the virtual machine is running and then rerun the backup.

Incremental backups of the VM may fail if the NTFS file system in the guest OS is corrupted and the backup uses MSDP storage. This error may occur in the following case:

• The VMware or Hyper-V backup policy specifies Media Server Deduplication Pool (MSDP) storage.

• The backup schedule includes incrementals (differential or cumulative).

• The NTFS file system in the VM's guest OS is corrupted. For example, the file system contains orphaned file record segments. The bptm debug log contains messages similar to the following:

  16:24:04.604 [5720.7068] <16> 6:bptm:5720:win2012-2.hrous.sen.com: 
  [ERROR] PDSTS: fbu_fill_bitmap: (1945) stream_offset(610848768) 
  + length(8192) > (1946) stream_offset(610848768)
  16:24:04.604 [5720.7068] <16> 6:bptm:5720:win2012-2.hrous.sen.com: 
  [ERROR] PDSTS: fbu_scan_buf: fbu_fill_bitmap() failed 
  (2060022:software error)

  Use the chkdsk command to examine the file system in the guest OS and repair it as needed. Then restart the VM and rerun the backup.

The problem may be one of the following:

• In a full virtual machine restore, the Overwrite virtual machine option was not selected: A virtual machine with the same GUID exists on the destination server. If a virtual machine with the same GUID exists on the destination server, you must select Overwrite virtual machine.

  Note:

  In an SCVMM environment, the VM GUID is referred to as the VM ID.

• For individual file restore through a shared location on the destination virtual machine, one or more of the files is larger than 2 GB. Restore such files to a virtual machine that has a NetBackup client. (This issue does not apply to recovery of the full virtual machine.)

• In a restore of common files, the virtual machines that use the common files were in the Running or Paused state. The virtual machines that use the common files must be in the Off or Saved state. Otherwise, a virtual machine may have a lock on the common files.

• The virtual machine is highly available (HA). But the node that owns the virtual machine is not the restore server (the node that performs the restore).

  See Problems with restore of the full virtual machine.

• The virtual machine restore job fails but the virtual machine is nonetheless registered in the Hyper-V server.

  See Problems with restore of the full virtual machine.

• A redirected restore failed because the virtual machine is configured in a volume GUID and its differencing disk is configured in another volume GUID.

  See Restored virtual machine fails to start.

• From a backup that was made with the WMI method, the restore failed because it took too long to write the virtual disk. This error may occur if the VM has a large fixed virtual disk.

  See Increasing the WMI create disk time-out value.