Dell PowerVault TL4000 SCSI Reference Guide - Page 7
Introduction
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Chapter 1. Introduction | This document describes the SCSI Media Changer Command Set for the Dell™ PowerVault™ TL2000 Tape | Library and TL4000 Tape Library. The host will recognize both a tape drive and a Media Changer on the same SCSI ID. On this SCSI ID logical unit zero is reserved for the tape drive and logical unit one is used for the media changer. The tape drive will pass the received SCSI commands for LUN 1 over to the attached library controller by means of serial communication. The SCSI media changer commands are based on the following specifications. Document SMC-2 SPC-3 SAM-2 T10 Version T10/1383-D rev 7 T10/1416-D rev 23 T10/1157-D rev 24 ANSI INCITS Version ANSI INCITS 382-2004 ANSI INCITS 366-2003 A media changer logical unit receives commands to move cartridges between various types in the element address space. The element types are storage, import-export, data transfer, and medium transport. The cartridge handling robotic subsystem, addressed as a medium transport element, moves cartridges within a media changer. The media changer logical unit maintains an inventory of cartridges and the element addresses. The media changer logical unit reports this inventory when requested as well as identifying the element address assigned to different types of elements. 1-1