Abstract: A method and system for managing operation streams for multiple memory devices is presented. The method determines cross-dependencies among multiple operations and uses the cross-dependencies to optimize the execution of the operations. Also presented is a method of synchronizing memory devices with little adverse effects on system operations. The method entails sampling the objects in a predetermined order. Since the system is in normal use while the sampling is happening, an operation is received to be performed on at least one target object. A state of the target object is determined. If the target object is in a revising state, revision is performed on the second storage system and the operation is applied to the target object but its application to the second memory device is deferred until the target object is in its final state.

Abstract: A system and method for efficiently implementing a local or distributed file system is disclosed. The system may include a distributed virtual file system (“dVFS”) that utilizes a persistent intent log (“PIL”) to record transactions to be applied to the file system. The PIL is preferably implemented in stable storage, so that a logical operation may be considered complete as soon as the log record has been made stable. This allows the dVFS to continue immediately, without waiting for the operation to be applied to a local or real file system. The dVFS may further incorporate replication to one or more remote file systems as an integral facility.