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. [. . . ] Page Code 01h 02h 0Ah 0Fh 11h 1Ch 3Eh Description Read / Write Error Recovery (Page 4-49) Disconnect / Reconnect (Page 4-51) Control Mode (Page 4-51) Data Compression (Page 4-56) Medium Partition (Page 4-58) TapeAlert (Page 4-60) EEPROM Vendor Specific (Page 4-61) Page Code Additional Page Length This bit indicates the number of bytes in that page. The tape drive returns the length on MODE SENSE; the initiator must subsequently set it to the same value when performing a MODE SELECT command. If the page length does not match the length the tape drive expects, the tape drive returns a CHECK CONDITION status with the Sense Key set to ILLEGAL REQUEST. The tape drive returns a CHECK CONDITION status with an ILLEGAL REQUEST Sense Key if it receives an unsupported Page Code or any Page field with values not supported or changeable. In this case, the command changes no parameters. 4-48 July 2004 81-81276-01 Rev A01 DLT1/VS80 SCSI Interface Guide 4. 9. 3 Read/Write Error Recovery Page (01h) The tape drive supports the Error Recovery Page, which has the following format: Bit Byte 0 1 2 3 4-7 8 9 - 11 Rsv'd Rsv'd TB 7 PS (0) 6 0 5 4 3 2 1 0 Page Code (01h) Additional Page Length (0Ah) Rsv'd EER PER DTE DCR Read Retry Count Reserved Write Retry Count Reserved Figure 4-32. Read / Write Error Recovery Page -- Data Format In this page, only the Post Error (PER) flag parameter is changeable. With PER set, the tape drive creates CHECK CONDITIONS, with Sense Key of RECOVERED ERROR, and Vendor Unique Sense Data detailing the cause. These events should be rare and only occur if the recovered write or read retry rates reach excessive levels. 81-81276-01 Rev A01 July 2004 4-49 Chapter 4: SCSI Commands Table 4-30. Field Name TB EER PER DTE DCR Read / Write Error Recovery Page (01h) -- Field Descriptions Description Transfer Block. This bit turns on reporting of CHECK CONDITIONS to report recovered Read / Write errors. This field reports the maximum number of times the tape drive tries to reread before declaring an unrecoverable error. This field reports the maximum number of times the tape drive tries to overwrite before declaring an unrecoverable error. Read Retry Count Write Retry Count 4-50 July 2004 81-81276-01 Rev A01 DLT1/VS80 SCSI Interface Guide 4. 9. 4 Disconnect/Reconnect Page (02h) The tape drive supports the Disconnect/Reconnect Page, which has the following format: Bit Byte 0 1 2 3 (MSB) 4-5 Bus Inactivity Limit (LSB) (MSB) 6-7 Disconnect Time Limit (LSB) (MSB) 8-9 Connect Time Limit (LSB) (MSB) 10 - 11 Maximum Burst Size (LSB) 12 13 - 15 Reserved Reserved DTDC 7 PS (0) 6 0 5 4 3 2 1 0 Page Code (02h) Additional Page Length (0Eh) Buffer Full Ratio Buffer Empty Ratio Figure 4-33. Disconnect / Reconnect Page -- Data Format In this page, only the Maximum Burst Size parameter is changeable. Table 4-31. Field Name Maximum Burst Size Disconnect / Reconnect Page (02h) -- Field Descriptions Description This value specifies the maximum amount of data that can be transferred without disconnecting. If it is not, the tape drive returns CHECK CONDITION, RECOVERED ERROR, ROUNDED PARAMETERS. 81-81276-01 Rev A01 July 2004 4-51 Chapter 4: SCSI Commands Table 4-31. Field Name DTDC Disconnect / Reconnect Page (02h) -- Field Descriptions (Continued) Description Data Transfer Disconnect Control. The DTDC field defines further restrictions when disconnect is permitted. DTDC 00b 01b Description Data Transfer Disconnect Control is not used. A target does not attempt to disconnect once the data transfer of a command has started until all data the command is to transfer has been transferred. Reserved A target does not attempt to disconnect after the data transfer of a command has started until the command is complete. 10b 11b If DTDC is non-zero and the maximum burst size is non-zero, the tape drive returns CHECK CONDITION status. The Sense Key is set to ILLEGAL REQUEST and the Additional Sense Code set to ILLEGAL FIELD IN PARAMETER LIST. 4-52 July 2004 81-81276-01 Rev A01 DLT1/VS80 SCSI Interface Guide 4. 9. 5 Device Configuration Page (10h) The tape drive supports the Device Configuration Page, which has the following format: Bit Byte 0 1 2 3 4 5 (MSB) 6-7 Write Delay Time (LSB) 8 9 10 (MSB) 11 - 13 Buffer Size at Early Warning (Optional) (LSB) 14 15 Select Data Compression Algorithm Reserved EOD Defined DBR BIS RSmk AVC Gap Size EEG SEW Reserved SOCF RBO REW Rsv'd CAP CAF Active Partition Write Buffer Full Ratio Read Buffer Empty Ratio 7 PS (0) 6 0 5 4 3 2 1 0 Page Code (10h) Additional Page Length (0Eh) Active Format Figure 4-34. Device Configuration Page -- Data Format In this page, only the Write Delay Time and Select Data Compression Algorithm parameters are changeable. Table 4-32. Field Name CAP CAF Active Format Device Configuration Page -- Field Descriptions Description This field is not supported and must be 0. This field is not supported and must be 0. 81-81276-01 Rev A01 July 2004 4-53 Chapter 4: SCSI Commands Table 4-32. Field Name Device Configuration Page -- Field Descriptions (Continued) Description Only partition 0 is supported. [. . . ] The Status Pages consist of a header and one or more element descriptors, one for each element address. The data shown assumes the CDB was specified in such a way that all descriptors for a given element type would be returned. 5-4 July 2004 81-81276-01 Rev A01 DLT1/VS80 SCSI Interface Guide The Primary and Alternate Volume Tag functions are not supported. The flags indicating these functions in the Element Status Pages are always 0. 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. [. . . ]