Exabyte VXA-2, Руководство по эксплуатации продукта, Страница: 49 / 90

D
ECEMBER
2003 VXA-2
39
SCSI C
OMMAND
P
ROTOCOL
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.
RECEIVE
DIAGNOSTIC
RESULTS
1Ch Reports the results of the tests requested by a previous SEND
DIAGNOSTIC command.
RELEASE UNIT 17h Releases the tape drive from exclusive use by the initiator that had
previously reserved it with a RESERVE UNIT command.
REQUEST SENSE 03h Requests that the tape drive transfer sense data to the initiator.
RESERVE UNIT 16h Reserves the tape drive for exclusive use by the initiator that issued
the command.
REWIND 01h Causes the tape drive to rewind the tape to the logical beginning of
partition.
SEND DIAGNOSTICS 1Dh Causes the tape drive to perform certain self-diagnostic tests.
SPACE 11h Enables the tape drive to perform forward or backward searches
using logical blocks, filemarks, or setmarks. Also allows spacing to
end of data (EOD).
TEST UNIT READY 00h Allows you to determine if the tape drive is ready to accept an
appropriate medium access command.
VERIFY 13h Enables the tape drive to verify one or more logical blocks of data on
the tape.
WRITE 0Ah Transfers one or more bytes or blocks of data from the initiator to the
tape drive.
WRITE BUFFER 3Bh Transfers new microcode from the initiator into the tape drive’s
EEPROM.
WRITE FILEMARKS 10h Causes the tape drive to write any data remaining in its buffer, then
to write one or more filemarks or setmarks to tape.
Table 6-1 SCSI command set (continued)
Command Hex Code Description