User manual QUANTUM DLT8000

[. . . ] DLTTM 8000 Tape System Product Manual Nov. 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. [. . . ] Each block, except for parameter code 05h is comprised of 8 bytes. The parameter block for code 05h is 12 bytes. LOG PAGE HEADER Bit Byte 0 Reserved Page Code 7 6 5 4 3 2 1 0 1 (MSB) 2-3 Reserved Page Length (LSB) Figure 5­16 Log Page Header Format Table 5­17 Log Page Header Field Descriptions Field Name Page Code Page Length Description The Page Code specifies for which Log Page this LOG SELECT command is directed. The Page Length field specifies the total number of bytes contained in this log page, not including the four bytes that make up the header. 5-40 Quantum DLT 8000 Tape System SCSI Commands LOG SELECT Command (4Ch) (continued) LOG PARAMETERS Bit Byte (MSB) 0 -1 Parameter Code (LSB) 2 DU DS TSD ETC TMC Rsv'd LP 7 6 5 4 3 2 1 0 3 (MSB) 4-7 Parameter Length Parameter Value (LSB) Figure 5­17 Log Parameters Format Table 5­18 Log Parameters Field Descriptions Field Name Parameter Code Description Parameter Codes supported for the READ/WRITE error counter pages are as follows: Parameter Code Descriptions 00h 01h 02h 03h 04h 05h 06h 8000h Errors corrected with substantial delays Errors corrected with possible delays Total rewrites or rereads Total errors corrected Total times correction algorithm processed Total bytes processed Total uncorrected errors Vendor Unique Note: Parameter codes 00h, 01h, and 04h always have a value of 0. Parameter value for 05h is 8 bytes; the parameter length is set to 8. Quantum DLT 8000 Tape System 5-41 SCSI Commands LOG SELECT Command (4Ch) (continued) Table 5­18 Log Parameters Field Descriptions (continued) Field Name Description NOTE Byte 2 of the Log Parameter Block is referred to as the Parameter Control Byte; it is made up of six control bits plus one bit that is reserved. This bit is not defined for LOG SELECT; the target ignores any value in DU. DS and Target Save Disable (TSD) must be set to 1. If DS and/or TSD are set to 0, command terminates with CHECK CONDITION status, sense key set to ILLEGAL REQUEST, and additional sense code set to INVALID FIELD IN PARAMETER LIST. If TSD and/or DS are set to 0, command terminates with CHECK CONDITION status, sense key set to ILLEGAL REQUEST, and additional sense code set to INVALID FIELD IN PARAMETER LIST. When set to 1, drive performs a comparison with threshold values once the cumulative value is updated. Comparison criteria is defined in Threshold Met Criteria (TMC). If the comparison is met and the RLEC bit of MODE SELECT / SENSE Control Page 0Ah is set to 1, then a UNIT ATTENTION is generated for all initiators. The additional sense code is set to THRESHOLD CONDITION MET. If the RLEC bit is 0 and the comparison is met, then UNIT ATTENTION is not generated. TSD ETC (continued) 5-42 Quantum DLT 8000 Tape System SCSI Commands LOG SELECT Command (4Ch) (continued) Table 5­18 Log Parameters Field Descriptions (continued) Field Name TMC Description Threshold Met Criteria. Once the criteria specified in this field is met and the ETC bit is 1 and the RLEC bit in MODE SENSE / SELECT Control Page is set to 1, then UNIT ATTENTION is generated for all initiators. The criteria for comparison are: Code Basis of Comparison 00b Every update of the cumulative value 01b Cumulative value equal to threshold value 10b Cumulative value not equal to threshold value 11b Cumulative value greater than threshold value · The Default Threshold Values are the maximum values that each parameter can attain. · The Current Cumulative Values are the values computed since the last reset of the device (either via power-cycle, BUS DEVICE RESET, or SCSI RESET. · The Default Cumulative Values are the values to which each parameter is initialized at a reset condition. · By default, Current Threshold Values = Default Threshold Values. Note that all types of parameter values are changeable via LOG SELECT. LP Parameter Length Parameter Value List Parameter. This bit should always be set to 0 to indicate parameter codes are treated as data counters. This field specifies the number of bytes of the parameter value. [. . . ] 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. · · When EMUL7K_MODE is set to 1, DLT 7000 emulation is enabled on the drive. [. . . ]