User manual QUANTUM 818127601REVA01

[. . . ] DLT1/VS80 SCSI Interface Guide DLT1/VS80 SCSI Interface Guide Copyright Copyright © 2003, 2004 Quantum Corporation. Document Origination: Boulder, Colorado, USA. Trademarks Quantum, the Quantum logo, and the DLTtape logo are trademarks of Quantum Corporation, registered in the U. S. A. DLTtape, DLTSage, and Super DLTtape are trademarks of Quantum Corporation. Other company and product names used in this document are trademarks, registered trademarks, or service marks of their respective owners. Legal Disclaimers The information contained in this document is the exclusive property of Quantum Corporation. [. . . ] Device Status (3Eh) Log Page Header -- Data Format Device Status (3Eh) Log Page parameters (0000h through 0002h) are as follows: Bit Byte 7 (MSB) 0-1 Parameter Code (LSB) 2 3 (MSB) 4-7 Parameter Value (LSB) DU DS TSD ETC TMC Rsv'd LP 6 5 4 3 2 1 0 Parameter Length (04h) Figure 4-25. Device Status (3Eh) Log Page Parameters (0000h through 0002h) -- Data Format 4-42 July 2004 81-81276-01 Rev A01 DLT1/VS80 SCSI Interface Guide Table 4-25. Field Name Device Status (3Eh) Log Page Parameter -- Field Descriptions Description Parameter Control Byte ­ DU, DS, TSD, ETC, TMC, and LP are collectively referred to as the Parameter Control Byte. Since the tape drive does not support saving parameters, this bit is always 1. Since the tape drive does not support saving parameters, this bit is always 1. The tape drive does not support Threshold Checking on this page. This bit is always 0 since the tape drive treats the parameter codes as data counters. TMC LP Parameter Code (0000h) Parameter Code (0001h) This parameter specifies the device type. For sequential type devices, the parameter value is always (00 01 00 00h). This parameter specifies the tape drive cleaning related status. There are three bits currently defined in this parameter. The Device Status (3Eh) Log Page parameter code (0001h) description follows: Bit Byte 0 (MSB) 1-3 Reserved (LSB) 7 6 5 Reserved 4 3 2 ClnQ 1 ClnR 0 ClnEx Figure 4-26. Device Status (3Eh) Log Page Parameter Code (0001h) -- Data Format 81-81276-01 Rev A01 July 2004 4-43 Chapter 4: SCSI Commands Table 4-26. Field Name ClnQ ClnR ClnEx Device Status (3Eh) Log Page Parameter Code (0001h) -- Field Descriptions Description Set to 1 if a Cleaning Required condition exists. Set to 1 if a Cleaning Requested condition exists. Set to 1 if the cleaning medium is used up. The value of this parameter contains the number of loads over the life of the tape drive. Parameter Code (0002h) 4. 9 MODE SELECT (15h/55h) The MODE SELECT command enables the host to configure the tape drive. Implementing MODE SELECT and MODE SENSE requires a certain amount of handshaking between the host and the tape drive. Before configuring the tape drive, the host should issue a MODE SENSE to get the current configuration and determine what parameters are configurable. The host interprets this information and can then issue MODE SELECT to set the tape drive to the host's preferred configuration. Bit Byte 0 1 2-3 4 5 Unused Logical Unit Number 7 6 5 4 3 2 1 0 Operation Code (15h) PF Reserved Parameter List Length Reserved Flag Link Reserved SP(0) Figure 4-27. MODE SELECT (15h) 6-Byte Command Descriptor Block -- Data Format 4-44 July 2004 81-81276-01 Rev A01 DLT1/VS80 SCSI Interface Guide . Bit Byte 0 1 2-6 7 6 5 4 3 2 1 0 Operation Code (55h) Logical Unit Number PF Reserved (MSB) Reserved SP(0) 7-8 Parameter List Length (LSB) 9 Unused Reserved Flag Link Figure 4-28. MODE SELECT (55h) 10-Byte Command Descriptor Block -- Data Format The tape drive always powers up with its default configurations set. This is also true if the tape drive receives a BUS DEVICE RESET message or a hard reset through the RST line on the SCSI bus. Table 4-27. Field Name LUN PF MODE SELECT (15h/55h) Command Descriptor Block -- Field Descriptions Description Logical Unit Number. Only an IDENTIFY message can change the LUN. This bit indicates that the data the host sent after the MODE SELECT header and block descriptors complies with the definition of pages in the SCSI-2 specification. [. . . ] Figure 5-4 shows the data format for the command header. Bit Byte 0 1 Logical Unit Number (MSB) 2­3 Starting Elements Address (LSB) (MSB) 4­5 Number of Elements (LSB) 6 (MSB) 7­9 Allocation Length (LSB) 10 11 Unused Reserved Reserved Flag Link Reserved 7 6 5 4 3 2 1 0 Operation Code (B8h) VolTag Element Type Code Figure 5-4. READ ELEMENT STATUS (B8h) Command Descriptor Block-- Header Format Table 5-2 shows the element type codes and their definitions. Table 5-2. Code 0h 1h 2h 3h 4h 5h-Fh Element Type Code Definitions Description All element types reported (valid in CDB only) Medium Transport Element Storage Element (magazine slot) Import Export Element (not supported) Data Transfer Element (tape drive) Reserved 81-81276-01 Rev A01 July 2004 5-5 Chapter 5: Supported SCSI-2 Medium Changer Device Commands 5. 4. 1 Element Status Header Figure 5-5 shows the data format for the Element Status header. Bit Byte 7 (MSB) 0­1 First Element Address Reported (LSB) (MSB) 2­3 Number of Elements Reported (LSB) 4 (MSB) 5­7 Byte Count of Report Available (LSB) Reserved 6 5 4 3 2 1 0 Figure 5-5. Element Status Header -- Data Format 5-6 July 2004 81-81276-01 Rev A01 DLT1/VS80 SCSI Interface Guide 5. 4. 2 Medium Transport Element Status Page Figure 5-6 shows the format for the Medium Transport Element Status header; Figure 5-7, the descriptor. Bit Byte 0 1 PVolTag (MSB) 2­3 Transport Element Descriptor Length (LSB) 4 (MSB) 5­7 Byte Count of Descriptor Data Available (LSB) Reserved AVolTag 7 6 5 4 3 2 1 0 Element Type Code (1h = Medium Transport) Reserved Figure 5-6. [. . . ]