Storage system and data transfer control method

A computer system, comprising:

• a first storage system;
• and
• a second storage system,
• the first storage system including:
• at least one first processor for processing data requested to be input and output;
• a plurality of first transfer controllers for transferring data between memories in the first storage system;
• at least one first transfer sequencer for requesting the plurality of first transfer controllers to transfer data in accordance with an instruction from the processor;
• a first host interface coupled to a host computer;
• a second host interface coupled to the second storage system;
• and
• a first cache memory for temporarily storing data being transferred from the first host interface to the second host interface, and the second storage system including:
• at least one second processor for processing write data requested to be input and output;
• a plurality of second transfer controllers for transferring data between memories in the second storage system;
• at least one second transfer sequencer for requesting the plurality of second transfer controllers to transfer data in accordance with an instruction from the processor;
• a third host interface coupled to the first storage system;
• a storage device for storing data requested to be written from the host computer;
• a disk interface coupled to the storage device;
• and
• a second cache memory for temporarily storing data being transferred from the third host interface to the disk interface, wherein:
• the first processor generates a seventh parameter used to transfer the write data from the first host interface to the second host interface without storing the write data in the first cache memory, an eighth parameter used to transfer the write data from the second host interface to the third host interface, a ninth parameter used to transfer the write data from the third host interface to the disk interface without storing the write data in the second cache memory and a tenth parameter used to transfer the write data from the disk interface to the storage device;
• the at least one first transfer sequencer controls cache-less data transfer from the first host interface to the second host interface without storing data in the first cache memory in accordance with the generated seventh parameter, and controls data transfer from the second host interface to the third host interface in accordance with the generated eighth parameter;
• and
• the at least one second transfer sequencer controls cache-less data transfer from the third host interface to the disk interface without storing data in the second cache memory in accordance with the generated ninth parameter, and controls data transfer from the disk interface to the storage device in accordance with the generated tenth parameter.

A transfer control method for data in a storage system for inputting and outputting data in accordance with a request from a host computer, the storage system including at least one processor for processing data requested to be input and output, a plurality of transfer controllers for transferring data between memories, and a transfer sequencer for requesting the plurality of transfer controllers to transfer data in accordance with an instruction from the processor,

• the method including the steps of:
• transmitting, by the processor, a series of data transfer requests to the transfer sequencer;
• requesting, by the transfer sequencer, each of the plurality of transfer controllers to transfer data based on the series of data transfer requests;
• and
• transferring, by each transfer controller, the data between the memories in accordance with an instruction from the transfer sequencer.