Electrical computers and digital data processing systems: input/ – Intrasystem connection – Bus access regulation
Patent
1998-09-18
2000-09-05
Ray, Gopal C.
Electrical computers and digital data processing systems: input/
Intrasystem connection
Bus access regulation
710 9, G06F 1300, G06F 1310
Patent
active
061157724
ABSTRACT:
An interface for expanding the number of SCSI hosts that can access a storage array includes a SCSI interface chip for receiving a SCSI command from a host via a SCSI bus, a domain indicator for providing a domain number assigned to the SCSI chip, a memory device for storing data and code, and a processing unit responsive to the code and operative to generate a device address from the domain number, the target number, and the logical unit number, and to execute the SCSI command with a particular device of the storage array corresponding to the device address. The domain indicator may be either hardware based (e.g., a mechanical selector switch) or software based (e.g. written to a data storage device of the interface via a SCSI host or WIE the storage array). A method for interfacing a SCSI host with a storage array includes the steps of receiving a SCSI command from the host via a connection to the SCSI bus, the SCSI command including a target number and an LUN, receiving a domain number assigned to the connection to the SCSI bus, generating a device address from the domain number, the target number, and the LUN, and executing the SCSI command with one of the storage devices corresponding to the generated device address.
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International Business Machines Inc.
Ray Gopal C.
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