Article ID: 115564, created on Feb 18, 2013, last review on May 11, 2014

  • Applies to:
  • Virtuozzo 6.0


A virtual machine based on Windows Server 2008R2 with Parallels Virtuozzo Containers for Windows freezes.

A lot of similar messages are displayed in /vz/vmprivate/VMNAME.pvm/parallels.log:
12-28 07:53:06.305 D /vm:242559:ad7fb700/ Time shift changed: new time shift is: -1200
12-28 07:53:06.305 D /vm:242559:ad7fb700/ Time shift changed: new time shift is: 0
12-28 07:54:11.383 D /vm:242559:ad7fb700/ Time shift changed: new time shift is: -60
12-28 07:54:11.383 D /vm:242559:ad7fb700/ Time shift changed: new time shift is: 0
12-28 07:55:31.524 D /vm:242559:ad7fb700/ Time shift changed: new time shift is: -61
12-28 07:55:31.524 D /vm:242559:ad7fb700/ Time shift changed: new time shift is: -1
12-28 07:57:13.664 D /vm:242559:ad7fb700/ Time shift changed: new time shift is: -60
12-28 07:57:13.664 D /vm:242559:ad7fb700/ Time shift changed: new time shift is: 0
12-28 07:57:53.677 D /vm:242559:ad7fb700/ Time shift changed: new time shift is: -1


This issue is caused by Time Synchronization enabling, which is triggered upon every container startup and it leads to performance degradation.


Do not use Time Synchronization for virtual machines running Parallels Virtuozzo Containers inside.

To disable time synchronization, edit /vz/vmprivate/VMNAME.pvm/config.pvs and verify that the TimeSync "Enabled" option is set to zero:
 <TimeSync SyncInterval_patch="1" dyn_lists="">

A virtual machine restart is required to apply the changes.

c62e8726973f80975db0531f1ed5c6a2 2897d76d56d2010f4e3a28f864d69223 0dd5b9380c7d4884d77587f3eb0fa8ef

Email subscription for changes to this article
Save as PDF