While we are going to migrate (cold migration) one VM which is running Windows Server 2008 R2 Standard, we found Migrate option is disabled. Then tried with the migration option available in summery tab of the VM and got the error message – The method is disabled by 'moref=vm-1811'.The source and destination host is running ESXi 5.0. The VM does not have any snapshot. We are trying to change both host and datastore and it is happening fo only one particular VM others are migrated successfully. Could you anyone kindly suggest why it is happening and how to overcome?
I have seen this happen between esx 4 5 an d versions if the virtual hardware is old. As well as old tools versions.
You can try to create a snapshot and then delete all if there is something hanging out from a old snapshot that is not visible.
Is your environment all esx 5, have there been past upgrades done.
Have you tried a migration via the cli ?