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PRODUCT MANUAL 433689-01
CHAPTER 6 COMMUNICATION INTERFACE AND COMMAND PROTOCOL
SCSI COMMAND PROTOCOL
This section provides an overview of the SCSI command protocol supported
by the VXA-320 (VXA-3) tape drive.
COMMAND SET
Tab le 6- 6 lists and briefly describes the command set supported by the tape
drive.
t
Table 6-6 SCSI command set
Command
Operation
Code
Description
ERASE 19h Causes the tape drive to erase all data from the current location to
the end of partition.
INQUIRY 12h Requests that information about tape drive parameters be sent to the
initiator.
LOAD/UNLOAD 1Bh Causes the tape drive to load or unload a cartridge.
LOCATE 2Bh Positions the tape at a specified logical position or changes partitions.
(Typically, this position is determined by data that was obtained
through a previous READ POSITION command.)
LOG SELECT 4Ch Manages a set of internal counters regarding read and write error
recovery operations and amounts of data compressed. The initiator
can set threshold and cumulative values for the counters or reset the
counters.
LOG SENSE 4Dh Returns the values of the counters managed by the LOG SELECT
command.
MODE SELECT 15h Allows you to specify medium, logical unit, and device parameters.
MODE SENSE 1Ah Enables the tape drive to report medium, logical unit, or device
parameters.
PREVENT/ALLOW
MEDIUM REMOVAL
1Eh Allows or disallows the removal of the cartridge from the tape drive.
READ 08h Transfers one or more bytes or blocks of data from the tape to the
initiator.
READ BLOCK LIMITS 05h Requests that the tape drive return data identifying the maximum
and minimum logical block lengths supported.
READ BUFFER 3Ch Creates a diagnostic listing of the tape drive’s current state or the
contents of the tape drive’s data buffer.
READ POSITION 34h Reports the tape drive’s current logical position, but does not cause
tape motion to occur. Used in conjunction with the LOCATE
command.