>What exactly is the value of 'target id' when my lun spans multiple >disks ?? I am not able to understand how the physical disk address would >be obtained when a lun spans multiple disks Do you understand that a target is bigger than a logical unit? A physical unit has a target ID and is subdvided into logical units which have logical unit numbers. The logical unit number identifies a logical unit within a physical unit. There is no such thing as a logical unit that spans physical units. In some advanced storage subsystems, the physical subsystem contains a whole bunch of disks and space on those disks is allocated arbitrarily to logical units. In that case, the whole subsystem is the physical unit and has one target ID. And there is no SCSI identifier that identifies the individual disks -- they are invisible to the SCSI protocol. - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
