User manual QUANTUM 818120001

[. . . ] SDLT 600 SCSI Interface Guide SDLT 600 SCSI Interface Guide Copyright Copyright © 2004 by 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. [. . . ] The value the drive returns indicates whether data decompression is enabled or not. When the drive reads compressed data from tape, it automatically decompresses the data before sending it to the host. RED Report Exception on Decompression. The drive does not report exceptions on decompression (boundaries between compressed and decompressed data). The value for this field is 10h, indicating that the Lempel-Ziv highefficiency data compression algorithm is in use. Compression Algorithm 4-120 July 2004 81-81200-01 REV A02 SDLT 600 SCSI Interface Guide Chapter 4: SCSI Commands Table 4-68. Field Name Data Compression MODE SENSE Page -- Field Descriptions (Continued) Description The value for this field is 10h, indicating that the Lempel-Ziv highefficiency data decompression algorithm is in use. If EEPROM parameter EnaRepDCcomp is set, the drive reports a value of 0 if the last block read is not decompressed. Decompression Algorithm 81-81200-01 REV A02 July 2004 4-121 MODE SENSE (6) / (10) Command (1Ah / 5Ah) SDLT 600 SCSI Interface Guide Device Configuration Page (10h) The drive supports the Device Configuration Page. The format for the page is shown below. Bit Byte 0 1 2 3 4 5 (MSB) 6­7 Write Delay Time (LSB) 8 9 10 (MSB) 11 ­ 13 Buffer Size at Early Warning (0) (LSB) 14 15 Reserved Select Data Compression Algorithm Rewind on Reset AsocWP PersWP PrmWP EOD Defined (0) DBR (0) BIS (1) RSmk (0) AVC (0) Gap Size (0) EEG SEW SWP Reserved SOCF (0) RBO (0) REW (0) Rsv'd Obsolete CAF (0) Active Partition (0) Write Buffer Full Ratio Read Buffer Empty Ratio 7 PS (0) 6 Rsv'd 5 4 3 2 1 0 Page Code (10h) Page Length (0Eh) Active Format (0) Figure 4-68. Device Configuration MODE SENSE Page -- Data Format 4-122 July 2004 81-81200-01 REV A02 SDLT 600 SCSI Interface Guide Chapter 4: SCSI Commands Table 4-69. Field Name PS Page Code Page Length Device Configuration MODE SENSE Page -- Field Descriptions Description Parameters Savable. The length is returned on MODE SENSE and must subsequently be set to the same value when performing MODE SELECT. Indicates how full the buffer should be before the drive restarts writing to the medium. The drive sets this field to 0 (unused) since it uses an automatic adaptive mechanism to adjust its ratio dynamically according to the average data rates over the SCSI bus. Indicates how empty the buffer should be before the drive restarts reading from the medium. The drive sets this field to 0 (unused) since it uses an automatic adaptive mechanism to adjust its ratio dynamically according to the average data rates over the SCSI bus. Indicates the maximum time in 100 msec increments that the drive waits with a partially fully buffer before forcing the data to tape. Note that the buffer full / empty ratio, which is dynamic, can cause the drive to write data sooner than the WRITE delay time value indicates. The minimum value is 15 (Fh), the maximum value is 6500 (1964h), representing a range in delay of 1. 5 seconds to 11 minutes. Always set to 0. CAF Active Format Active Partition Write Buffer Full Ratio Read Buffer Empty Ratio Write Delay Time DBR BIS RSmk AVC SOCF RBO 81-81200-01 REV A02 July 2004 4-123 MODE SENSE (6) / (10) Command (1Ah / 5Ah) SDLT 600 SCSI Interface Guide Table 4-69. Field Name REW Gap Size EOD Defined EEG Device Configuration MODE SENSE Page -- Field Descriptions (Continued) Description Report Early Warning. The drive generates an EOD mark before any change of direction following a WRITE-type operation. When set to 1, the drive writes any unwritten data or tapemarks to the medium before each command completes once the End of Medium early warning point is reached, effectively operating as if in unbuffered mode. When set to 0, the drive continues to operate in buffered mode, if enabled, past the End of Medium early warning point. Always set to 01b, indicating that the drive rewinds the tape medium on a logical unit reset operation. Always set to 0. SEW SWP Buffer Size at Early Warning Select Data Compression Algorithm Rewind on Reset AsocWP PersWP PrmWP 4-124 July 2004 81-81200-01 REV A02 SDLT 600 SCSI Interface Guide Chapter 4: SCSI Commands Medium Partition Page (11h) The drive supports the Medium Partition Page. The format for the page is shown below. Bit Byte 0 1 2 3 4 5 6 7 (MSB) 8­9 Partition Size (LSB) Reserved Reserved FDP (0) SDP (0) 7 PS (0) 6 Rsv'd 5 4 3 2 1 0 Page Code (11h) Page Length (06h) Maximum Additional Partitions (0) Additional Partitions Defined (0) IDP (0) PSUM (0) POFM Clear ADDP Medium Format Recognition (01) Partition Units Figure 4-69. [. . . ] The drive detects any potential buffer overruns and rejects the WRITE BUFFER command. 4-250 July 2004 81-81200-01 REV A02 SDLT 600 SCSI Interface Guide Chapter 4: SCSI Commands 4. 38. 3 Download Microcode Mode (04h) This mode uses buffer offsets to download the firmware image into the drive's buffer in parts. The firmware image must be downloaded in integral (whole) multiples of 8 KB. A Download Microcode and Save Mode WRITE BUFFER command must be issued for the image to become active. The drive must not contain any tape medium before starting an image download. [. . . ]