There are provided measures for enabling/realizing efficient snapshot creation in virtual network environment, especially for ensuring creation of consistent snapshots in an automated manner. Such measures exemplarily comprise that a virtual manager entity provides a notification of requested snapshot creation of a resource of a virtual machine entity for the virtual machine entity, the virtual machine entity executes snapshot preparation processing in response to the snapshot creation notification from the virtual manager entity, and the virtual manager entity executes snapshot processing on the basis of a snapshot preparation result provided by the virtual machine entity.