HP Surestore 28/48-Slot with DLT7000 Digital Linear Tape SCSI-2 Drive and SCSI - Page 278

Programmer's Tips Performance Tuning Error Recovery If the host receives an error (such as a read or write error) from the tape drive, the host should issue a Move Medium Command to the tape library to reload the tape into the drive. For example, if Drive 2 fails with a "Medium Error" while doing a read, the host should send the Move Medium Command with "Source=2" and "Destination=2." The host should then re-issue the Read Command to Drive 2. Determining Media Type Loaded The HP digital linear tape drives support the following ISO standard media types. • HP DLTtape IV Data Cartridges • HP DLTtape III XT Data Cartridges The Media Type field in the Mode Select Data Header reports what media type is in the tape drive. Cleaning Errors Use the control panel options or the Send Diagnostic commands 80, 81, 82, 83, 84 to clean drives (with HP 4228, 4248, and 4448 tape libraries, a cleaning cartridge must be in the reserved cleaning slot; with HP 4115 and 4215 tape libraries, the cleaning cartridge storage location must be specified). The Send Diagnostic command will return a Source Empty message if the cleaning tape is not in the storage slot and a Destination Full message if the drive to be cleaned contains a tape. If the host software will control tape cartridge moves and exchanges, the tape library modules can use a standard data cartridge storage slot. This process allows the host software to send a move command to move the cleaning cartridge to the drive and then to unload the cleaning cartridge from the drive. Since the second move command cannot be issued until the drive cleaning process completes, include a delay of three to five minutes in the routine. B- 8 Appendix B