Hi Kai! > The command definitions in scsi_debug are common to all devices. RSOC allows the device to report which fields in a given command are valid (identified as "Usage data" below). # sg_opcodes -o 0x8 /dev/sda Opcode=0x08 Command_name: Read(6) Command is supported [conforming to SCSI standard] No command duration limit mode page Multiple Logical Units (MLU): not reported Usage data: 08 ff ff ff ff c7 SBC Read(6) and an SSC Read(6) don't have the exact same fields. And consequently RSOC won't return the correct usage data for Read(6) in tape mode. CDB byte 1 for tape should be 0x3 (SILI|FIXED) not 0xff (Which I actually think is a bug, it should be 0x1f for SBC Read(6) since bits 5-7 are reserved)). Anyway. It's purely cosmetic. Nothing depends on this in practice, I don't think. -- Martin K. Petersen Oracle Linux Engineering
