Network Function Virtualization allows transformation from physical proprietary hardware to general purpose servers with virtual services. Depending on the available resources in the network, virtual services (functions) could be placed accordingly. The special entity is required too place functions and manage resources in the network. This entity is an Orchestrator. Usage of Orchestrator raises the problem of which action to undertake in case of orchestrator failure. The problem transforms into questions like: where to place these instances? How to manage fail overs? How many instances should be placed? The Orchestrator has risk of failure thus, to provide the high availability, this paper consider the fail over and placement problems.