Article ID: 121483, created on May 7, 2014, last review on Jun 17, 2016

  • Applies to:
  • Operations Automation 5.5
  • Virtuozzo 6.0
  • Virtuozzo hypervisor


A Virtual Machine online migration procedure fails between PCS 6 Update 6 host as the source and PCS 6 of earlier versions host as the destination. The error message is:

[root@pcs1 ~]# pmigrate v testvm v
Host key verification failed.
Migrate the VM testvm on ()
root@'s password:
Operation progress ...99%
Failed to migrate the VM: Operation canceled. The operation has been canceled.
/usr/bin/prlctl failed, exitcode=255

The following error messages can be found in /var/log/parallels.log on DST (with verbosity enabled only):

04-30 13:03:10.222 D /vm:18785:18794/ Resume: PRAM sare not detected.
04-30 13:03:10.222 F /vm:18785:18794/ Sav: [/var/parallels/testvm.pvm/config.sav]
04-30 13:03:10.436 F /vm:18785:18794/ Incompatible version. Detected version= 0x40001.0x30073. Expected version= 0x40001.0x30062.  Header size=0x111f0
04-30 13:03:10.436 F /vm:18785:18794/ Sav file verification failed
04-30 13:03:10.436 I /vm:18785:18794/ Resume finished with code 0x80020002

After the migration failure, the VM remains in INVALID state on the DST side:

[root@pcs ~]# prlctl list testvm
UUID                                    STATUS       IP_ADDR         T  NAME
{da9ab9cf-0f52-4138-bb47-4c7967fa3b10}  invalid    VM testvm


PCS 6.0 update 6 brings changes to the Virtual Machine memory dump file format, which makes it incompatible with earlier versions of the product.


The following solutions are possible:

  • Install Update 6 on DST;
  • Suspend the VM prior to the migration and resume it afterwards;
  • Use offline migration, i.e. migrate the VM in stopped state.

In order to fix the VM in INVALID state, follow the steps from this article.

Search Words

wrong location after migration

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migrate the VM between nodes (MXQR-PACSRV039.paci.cloudtelmex.loca--------->MXQR-PACSRV022.paci.cloudtelmex.loca)

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