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:
Sep. 16, 2008
Filed:
May. 25, 2005
Norio Hirako, Hadano, JP;
Shoji Kato, Odawara, JP;
Norio Hirako, Hadano, JP;
Shoji Kato, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a data input/output with other apparatus, a data transfer controller (DTC) of a storage controller multiprocesses a data transfer with the other apparatus by utilizing a saving/recovering operation and suppresses a load therefrom, thereby improving performance thereof. A first storage apparatus includes two DMA units in a data transfer LSI of the DTC, uses them to process one or more data transfers concurrently, uses the saving or recovering operation to a memory #also in one DMA unit to process the data transfer while the data transfers are switched, thereby multiprocessing a plurality of data transfers. Based on an instruction from the IOC, the DTC makes one of the DMA units recover the necessary data transfer information and data from the memory #and transfer the data to the memory, and concurrently the other of the DMA units, which is not processed presently, save in advance, to the memory #, the data transfer information and the data stored in the memory.