The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 02, 2007
Filed:
Feb. 26, 2004
Kazuhiko Ikeuchi, Kawasaki, JP;
Mikio Ito, Kawasaki, JP;
Hidejirou Daikokuya, Kawasaki, JP;
Kazuma Takatsu, Kawasaki, JP;
Katsuhiko Nagashima, Kawasaki, JP;
Koji Uchida, Kawasaki, JP;
Akihito Kobayashi, Kawasaki, JP;
Kazuhiko Ikeuchi, Kawasaki, JP;
Mikio Ito, Kawasaki, JP;
Hidejirou Daikokuya, Kawasaki, JP;
Kazuma Takatsu, Kawasaki, JP;
Katsuhiko Nagashima, Kawasaki, JP;
Koji Uchida, Kawasaki, JP;
Akihito Kobayashi, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A storage system prevents a time out error of the host I/O caused by a stagnation of command processing in the storage system for accessing a disk device according to the host I/O request and internal I/O request. In DTC, counters for managing the requests in-process for host I/Os (host read) and internal I/Os (pre-fetch, write back) individually are provided, and the number of processing requests to be issued to a virtual disk (RLU) is limited individually. By assigning priority to the host I/Os, the load balance of the host I/Os and internal I/Os can be controlled. For rebuild/copy back, a dedicated load control mechanism is disposed where the load adjustment between ordinary I/Os and rebuild/copy back is performed.