METADATA LOCK MANAGEMENT FOR HIGH-FUNCTION n-WAY SHARED STORAGE AREA CONTROLLER SYSTEM

摘要

PPROBLEM TO BE SOLVED: To provide a high-function storage area controller which is connected in an n-way storage area configuration provided with a shared storage area. PSOLUTION: A storage area controller in a network is equipped with an I/O execution component, a component for allocating the right of ownership of metadata concerned with data to an owner storage area controller node, a lock manager for controlling a lock of the metadata during I/O, and a storage area constitution element for transferring messages between storage area controller nodes to request the state of the metadata to allow a lock and also request the lock to be reset to send an unlock signal. Then I/O is carried out on data whose metadata are possessed by an arbitrary owner storage area controller node on condition that a metadata lock protocol controlled by the owner storage area controller is based upon, and consistent relation between an arbitrary copy of held data and the data is held upon occasion. PCOPYRIGHT: (C)2005,JPO&NCIPI