User manual QUANTUM 818500101

[. . . ] SDLT 220 and SDLT 320 SCSI Interface Guide SDLT 220 and SDLT 320 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. [. . . ] Clear the TapeAlert flag in an equivalent manner to taking corrective action for the flag indicated by the absolute number of the value. Set all TapeAlert flags and generate an exception condition based on the value in the MRIE field. -64 to -1 32, 767 81-85001-01 REV A04 July 2004 4-97 MODE SELECT (6) / (10) Command (15h / 55h) SDLT 220 and SDLT 320 SCSI Interface Guide 4. 9. 11 Vendor Specific Configuration Page (25h) The drive supports a Vendor Specific Configuration Page that is used to set or change the vendorunique configuration features. Figure 4-56 shows the page that can be changed using the MODE SELECT command and subsequently queried using the MODE SENSE command. Bit Byte 0 1 2 3 4­9 7 PS (0) 6 Rsv'd 5 4 3 2 1 0 Page Code (25h) Page Length (08h) Default Density Override Reserved Reserved RWCT Figure 4-56. Vendor Specific Configuration MODE SELECT Page -- Data Format 4-98 July 2004 81-85001-01 REV A04 SDLT 220 and SDLT 320 SCSI Interface Guide Chapter 4: SCSI Commands Table 4-58. Field Name PS Page Code Page Length Vendor Specific Configuration MODE SELECT Page -- Field Descriptions Description Parameters Savable. Identifies the type of MODE SELECT page being transferred. A value of 25h identifies this as the Vendor Specific Configuration Page. Indicates the number bytes in the page, excluding bytes 0 and 1. The length is returned in MODE SENSE commands and must subsequently be set to the same value when performing MODE SELECT. If the drive receives an unexpected page length value, it returns a CHECK CONDITION status with the Sense Key set to ILLEGAL REQUEST. The following density codes are the preferred codes used to define density. Code 00h 48h 49h Description Density override disabled. 133, 000 bpi, 56 logical tracks, serial cartridge tape 110. 0 GB / 220. 0 GB (Super DLTtape I). 190, 000 bpi, 56 logical tracks, serial cartridge tape 160. 0 GB / 320. 0 GB (Super DLTtape I). This one-byte field holds the setting of the density desired on a write from BOT. It can be set at any time, but is zeroed out during a cartridge load. Therefore, for the override to be meaningful, it must be set after the cartridge is loaded. After being set, its value overrides any application resetting the drive to default density (0) with the MODE SELECT command. Default Density Override RWCT Rewrite Calibration Tracks. Rewrite calibration tracks on the first WRITE from BOT or WRITE FILEMARKS from BOT, with one or more filemarks specified in the WRITE FILEMARKS CDB, after setting the RWCT bit. Use this feature to re-initialize the calibration tracks. The recommended implementation is to use the WRITE FILEMARKS command with 2 filemarks specified in the WRITE FILEMARKS CDB, after setting the RWCT bit. This is because a tape with two filemarks at BOT is widely recognized by software applications to indicate the tape is blank. Important: This function adds 10­18 minutes to the initial WRITE / WRITE FILEMARKS from BOT because calibration tracks are located at both ends of the tape. 81-85001-01 REV A04 July 2004 4-99 MODE SELECT (6) / (10) Command (15h / 55h) SDLT 220 and SDLT 320 SCSI Interface Guide 4. 9. 12 Disaster Recovery Control Page (3Ch) This page controls the operation of the Disaster Recovery Control Mode for the tape drive. Bit Byte 0 1 2 3­5 7 PS(0) 6 Rsv'd 5 4 3 2 1 0 Page Code (3Ch) Page Length (4) Reserved Reserved DRAct Figure 4-57. [. . . ] These commands do not cause the new image to become active. 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. This is to safeguard against accidentally starting a firmware update. [. . . ]