Orca Technical Note: Guests and Guest Controllers

This note explains support for dynamically adaptive guest applications in Orca. Orca is a software framework and open-source platform to manage a programmatically controllable shared substrate, which may include servers, storage, networks, or other devices. In this note the authors focus on a substrate of virtualized servers-a virtual cloud computing utility. Storage services are handled as special virtual servers using the facilities described here. Extensions for networks are under development and are out of scope for this note.