Patent ID: 7392317

Claim:
A system for migrating a migratable service in a server cluster, comprising: a server cluster comprising at least two servers; a migration target comprising a list of servers in the server cluster capable of hosting multiple migratable services, such that related migratable services can be moved together by a migration manager, wherein only one instance of each migratable service is active in the server cluster at any time; and the migration manager capable of moving a migratable service between servers in the server cluster, the migration manager ensuring that only one active instance of the migratable service exists in the server cluster at any time; a lease manager adapted to assign a lease period to a server in the server cluster, the lease period determining how long the server will host an instance of the migratable service; wherein the lease manager is further capable of renewing a lease period for a server in the server cluster so the service will remain active; and wherein an active instance of a migratable service is deactivated once the lease period expires.