File management sub-system and file migration control method in hierarchical file system
AssigneeHitachi, Ltd.
InventorsTakayuki Fukatani, Hitoshi Kamei, Takahiro Nakano
Life of this patent
Estimating the term…
Abstract
A file management sub-system executes file migration without causing an unintended drop in the response time or the like. When a management computer issues a file migration direction, a file storage apparatus notifies client computer associated with a migration target file that file migration is scheduled. When postponement or suspension of file migration is requested by the client computer, the file migration is postponed or suspended.
Claims13
A file management sub-system coupled to a first storage device, a sub-storage apparatus includes a second file system, and client computers, comprising:
- a microprocessor providing a unified file system based on a first file system stored in the first storage device and the second file system;
- a memory storing client management information which identifies the client computers;
- a communication interface with which the microprocessor communicates with the client computers, the sub-storage apparatus, and the first storage device,
- wherein, based on the client management information, the microprocessor sends migration information, which includes information relating to file migration, to a notified client computer, which is all or at least one of the client computers, via the communication interface on the basis of a first direction which is received from a direction source client computer directing execution of the file migration, or which is created by the microprocessor.
A file migration control method for changing real file systems in which files are stored in a hierarchical file system obtained, by hierarchizing respective real file systems of a plurality of storage devices and a single virtual file system unifying the real file systems,
- the method comprising:
- receiving a first direction from a direction source directing execution of file migration;
- sending migration information, including information relating to the file migration, to a notified client computer on the basis of the first direction;
- receiving response information from the notified client computers;
- suspending the file migration in a case where the response information requests suspension of the file migration;
- and
- postponing, in a case where the response information requests postponement of the file migration, the file migration until notification to cancel the postponement is made from the client computer which sends the response information.
Dependencies are inferred from the claim text.