Article ID: 126693, created on Aug 25, 2015, last review on Jan 19, 2016

  • Applies to:
  • Virtuozzo 6.0
  • Virtuozzo containers for Windows 4.6


  • Windows container to virtual machine migration fails:

    [root@virtuozzo ~]# pmigrate c administrator@ v WindowsVM
    Connecting to administrator@
    Querying configuration...
    Operation progress 10 %
    Error: Failed to migrate PVC 101
    Unable to get the necessary information about the Container. For details, see the log file on he source server:
    * On Linux - /var/log/parallels.log
    * On Windows - %SystemRoot%\Logs\Parallels.log
  • In %SystemRoot%\Logs\Parallels.log the following errors can be found:

    08-25 10:53:30.627 I /VzMigration:1112:13ac/
       get_vz_free_space: nbdmig[62250934] query free space (0)
    08-25 10:53:30.627 F /VzMigration:1112:13ac/
    VZ ERROR   : (e:\build\4.6.490.0\sources\virtuozzo\vzwin\vzmain\vznbdmig\vznbdmig.c:1737)
    08-25 10:53:30.627 F /VzMigration:1112:13ac/
        vzNbdMigTransfer: nbdmig[62250934] Not enough HN drive space. Drive should have at least 17064 MBs of free bytes to perform migration. (0)
  • The partition, where this container is located, has enough free space [ 17064MB in this example ].

  • The container resides on a non-system partition, and the system partition has no such free space available [ 17064MB in this example ].


The root cause of failed migration is a flaw in source node free space detection. The issue was acknowledged as a product bug with internal ID PCWIN-22639.


The permanent fix is included in Virtuozzo containers 4.6 update 91. Install the latest updates on the source server to mitigate the issue.

Search Words

Unable to get the necessary information about the Container

Not enough HN drive space

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