Abstract: 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.

Abstract: 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.

Abstract: A mechanism is provided for migration between stripe storage and redundant parity striped storage. When a disk is added to a disk array, the mechanism migrates from RAID 0 to RAID 5. For each row, the mechanism calculates parity for the row and, if the parity position is not the new drive, the mechanism writes the data from the parity position to the new drive and writes the parity to the parity stripe position. If a drive fails, the mechanism migrates back from RAID 5 to RAID 0. For each row, if the parity position is not the failed drive, reads the data from remaining drives, XORs the data stripes to get failed drive data, and writes the failed drive data to the parity position. If a read or write is received for the failed drive, the mechanism simply redirects the read or write to the parity position.