Storage apparatus

Details Storage apparatus Storage apparatus

2005-05-25

2008-09-16

Patel, Niketa I. (Department: 2181)

Electrical computers and digital data processing systems: input/

Input/output data processing

Direct memory accessing

C710S026000, C710S030000, C709S216000

Reexamination Certificate

active

07426588

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 #3also 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 #3and 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 #3, the data transfer information and the data stored in the memory.

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