User manual QUANTUM DLT8000

[. . . ] 10, 2003 81-60118-06 Quantum reserves the right to make changes and improvements to its products, without incurring any obligation to incorporate such changes or improvements in units previously sold or shipped. Quantum reserves the right to make changes to this product manual without incurring any obligation to notify recipients of earlier versions of the product manual. You can request Quantum publications from your Quantum Sales Representative or order them directly from Quantum. Publication Number: 81-60118-04, April 2, 2001 SERVICE CENTERS Quantum Service Center 715 Sycamore Avenue Milpitas, California 95035 Phone (888) 827-3378 FAX: (800) 4DISKFAX BBS: (800) 472-9799 Quantum Asia-Pacific Pte. [. . . ] If the medium was unloaded but the cartridge was not removed, a Load command causes the tape to be loaded to Beginning of Partition (BOP) again and made ready. If the Load bit is set to 0, and the medium is loaded, the drive writes any buffered data and filemarks to the tape and then rewinds the tape to BOM and unloads the medium back into the cartridge. The green Operate Handle indicator on the tape drive's faceplate illuminates and the cartridge can be removed from the tape drive. This bit is ignored by the tape drive unless both the EOT and Load bits are set to 1, then the drive returns CHECK CONDITION, ILLEGAL REQUEST data. Re-Ten Load 5-34 Quantum DLT 8000 Tape System SCSI Commands 5. 6 LOCATE Command (2Bh) The LOCATE command is used to do high-speed positioning to the specified block address. The READ POSITION command can be used to obtain the block address, when writing, when particular blocks of data (a data file, for example) are about to be written. The LOCATE command can then be used to position the tape back at the same logical position for high performance restore operations of particular blocks of data. Bit Byte 0 Operation Code (2Bh) 7 6 5 4 3 2 1 0 1 Logical Unit Number Reserved BT CP Immed 2 (MSB) 3-6 Reserved Block Address (LSB) 7 Reserved 8 Partition 9 Unused Reserved Flag Link Figure 5­14 LOCATE Command Descriptor Block -- Data Format Quantum DLT 8000 Tape System 5-35 SCSI Commands LOCATE Command (2Bh) (continued) Table 5­15 LOCATE Command Descriptor Block -- Field Descriptions Field Name BT Description Block Type. The Block Type bit indicates how the Block Address field is interpreted. The first recorded object (block or filemark) is at address 0, and Block Addresses count both data blocks and filemarks. Since multiple partitions are not supported, this bit must be set to 0. If this bit is set to 1, status is returned as soon as the operation is started. The Block Address field defines the SCSI Logical Block Address to which the media will be positioned. These addresses start at address 0 and include data blocks and filemarks. Not applicable (see Change Partition field above). CP Immed Block Address Partition 5-36 Quantum DLT 8000 Tape System SCSI Commands 5. 7 LOG SELECT Command (4Ch) The LOG SELECT command allows the host to manage statistical information maintained by the tape drive about its own hardware parameters or about the installed tape medium. The description should be read in conjunction with the description of the LOG SENSE command that follows it and provides the user with information about log page format, parameters, and supported pages. Bit Byte 0 Operation Code (4Ch) 7 6 5 4 3 2 1 0 1 Logical Unit Number (0) Reserved PCR SP 2 PC Reserved 3 Reserved 4 Reserved 5 Reserved 6 (MSB) 7-8 Reserved Parameter List Length (LSB) 9 Unused Reserved Flag Link Figure 5­15 LOG SELECT Command Descriptor Block -- Data Format Quantum DLT 8000 Tape System 5-37 SCSI Commands LOG SELECT Command (4Ch) (continued) Table 5­16 LOG SELECT Command Descriptor Block -- Field Descriptions Field Name PCR Description Parameter Code Reset. If this bit is set to 1 and the parameter list length is set to 0, all accumulated values of page codes 2, 3, and 32 are set to 0 and all threshold values are set to default. If PCR is set to 1 and the parameter list length is set to a non-zero value, the command terminates with a CHECK CONDITION status with sense key of ILLEGAL REQUEST and an additional sense code (ASC) of INVALID FIELD IN CDB. If for some reason the Save Page bit is set, the command terminates with a CHECK CONDITION status with a sense key of ILLEGAL REQUEST and an ASC of INVALID FIELD IN CDB. This field defines the type of parameter values to be selected: PC 00b 01b 10b 11b · Type of Parameter Values Current Threshold Values Current Cumulative Values Default Threshold Values Default Cumulative Values When the PC field is set to 00b or 01b and the Parameter List Length is set to 0, the command terminates with a CHECK CONDITION status, Sense Key of ILLEGAL REQUEST, and ASC of INVALID FIELD IN CDB. This occurs because modification of Current Threshold Values and Current Cumulative Values is not supported. When the PC field is set to 10b and the Parameter List Length field is set to 10b, then all Current Threshold Values are reset to the Default Threshold Values. This is equivalent to no change, since Threshold Values cannot be modified. When the PC field is set to 11b and the Parameter List Length field is set to 0, then all Current Cumulative Values are reset to the Default Cumulative Values. [. . . ] Applications will be able to distinguish between a DLT 7000 drive and a DLT 8000 drive in DLT 7000 emulation mode over the SCSI Bus via the "Product Family" code returned in the SCSI INQUIRY command's Vendor Unique Bytes. Once enabled, the DLT 7000 emulation setting will be retained even across power cycles in the tape drive. Quantum DLT 8000 Tape System G-1 Appendix G: DLT 7000 Emulation Feature Enabling and Clearing the DLT 7000 Emulation Feature CAUTION Use Extreme Caution when enabling the DLT 7000 emulation feature: the DLT 7000 emulation mode changes the operation of the tape drive and fundamentally changes the way data and media are handled. · · Do NOT enable/clear the DLT 7000 emulation feature with a tape cartridge loaded in the tape drive. Do NOT enable/clear the DLT 7000 emulation feature while the drive is in operation. 1. Enable and clear the DLT 7000 emulation mode via the SCSI bus by changing the EMUL7K_MODE parameter (in EEPROM) on the Vendor Unique EEPROM Parameter Page. [. . . ]