Quantum SDLT 320 Podręcznik Użytkownika Strona 89

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81-81148-01 March 2004 8-1
CHAPTER 8
Insertion and Extraction
Guidelines
8.1 Applicable Library Commands
This section discusses the commands and status bits that customers using a tape
library interface need to be familiar with to communicate with the tape drive.
The tape library system uses commands to get information from the tape drive or
to initiate tape drive action. The only time the tape drive accepts a command other
than the ATTENTION or data request command is after it receives a valid
ATTENTION command or data request command. At any other time, it discards
any data it does not recognize as an ATTENTION or data request command.
An SDLT 220/320 tape drive responds to an ATTENTION command (0x00) from
a tape library controller with a General Status packet. General Status contains
several bits that reflect the tape drive’s loader status and its ability to accept new
commands. It is intended that controller applications use OK to Load as the
primary indicator that a data cartridge can be inserted into the tape drive, and OK
to Eject as the primary indicator that the tape drive has a data cartridge waiting to
be ejected. Load Complete indicates tape is loaded and the read / write hardware is
functional. However the tape drive does not come ready on the SCSI bus until it
finishes calibration and various read directory operations.
NOTE: Use the ATTENTION command to poll the status of the
tape drive; once the status is obtained, programmatically
examine the contents of the General and Extended Status
packets to ascertain the exact status of the tape drive.
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