Methods of transmitting non-SCSI commands involving loading opcode in command descriptor block (CDB) bytes and non-SCSI commands into remaining CDB bytes
The present invention provides a method for transmitting a non-SCSI command via a SCSI command. A CDB for the SCSI command is provided. The CDB includes bytes byte — 0 , byte — 1 , byte — 2 , . . . , byte_n, in which byte — 0 includes an opcode for the SCSI command. An opcode for the non-SCSI command is loaded into byte — 1 . When the non-SCSI command is not greater than a fixed number of bytes, the non-SCSI command is loaded into at least one byte of the CDB, which includes byte — 2 . Data associated with the non-SCSI command is transmitted via a data phase associated with the SCSI command.
1. A method for transmitting a non-SCSI (non-Small Computer System Interface) read command via SCSI commands, comprising steps of providing a first CDB (Command Descriptor Block) for a Write Buffer command, said first CDB including context information, byte_ 0 , of said first CDB is an opcode for said Write Buffer command;
embedding a non-SCSI read command in Writer Buffer Data of said Write Buffer command, byte 1 of said first CDB is an opcode for said non-SCSI read command; providing a second CDB for a Read Buffer command, said second CDB including said context information, byte_ 0 , of said second CDB is an opcode for said Read Buffer command and byte_ 1 , of said second CDB is an opcode for said non-SCSI read command; and embedding data associated with said non-SCSI read command in Read Buffer Data of said Read Buffer command, wherein said context information comprises an identifier unique to said first CDB and is used to correlate said first CDB and said second CDB to complete transmission of said non-SCSI read command.
2. The method of claim 1 , wherein said first CDB and said second CDB are 10-byte CDBs.
3. The method of claim 1 , wherein byte_ 2 , byte_ 3 , byte_ 4 and byte_ 5 of said second CDB includes said context information.
4. The method of claim 1 , wherein said non-SCSI read command is a management command.