Storage system having a channel control function using a plurality of processors

A data transfer method for a storage system coupled to a host computer which includes:

• a channel adaptor including
• a local router including processor number information and transfer list index/processor number information, and
• a protocol processor transmitting and receiving data between the host computer and the local router;
• and
• a plurality of storage nodes each including a processor and a disk drive,
• wherein each of storage nodes provides the disk drive to the host computer as a logical unit,
• wherein the processor number information includes a logical unit number and a processor number of the storage node,
• wherein the transfer list index/processor number information includes the processor number for identifying the processor and index information for identifying a transfer list including instruction of which the processor sends to the protocol processor,
• the data transfer method for the storage system including:
• determining a first processor which is to be a transfer destination of a write request among a plurality of the processors based on the processor number information in case of receiving the write request from the host computer through the protocol processor, and
• generating a first transfer list which includes processing of which the first processor instructs to the protocol processor, and first index information which is an index of the first transfer list in case of receiving the write request.