Fujitsu M2488, Руководство по эксплуатации продукта

Страница: 84 / 528

TAPE UNIT SCSI COMMANDS M2488 PRODUCT GUIDE
4-2 CG00000-011503 REV. A April 1997
4-3 M2488 TAPE SCSI COMMANDS
The SCSI commands used with the M2488 are described in Table 4-1. For a more detailed description
of each command, refer to the paragraph listed in the PARAGRAPH column. The Command Descrip-
tion Block format is shown in paragraph 4-3.1 on page 4-4.
Table 4-1. M2488 SCSI Commands
OP
CODE
COMMAND DESCRIPTION PARAGRAPH
00h TEST UNIT READY Provides a means to check if the logical unit is ready. 4-3.30 on page 4-138
01h REWIND Causes a rewind to BOT. 4-3.26 on page 4-115
03h REQUEST SENSE
Requests that the target transfer sense data to the initia-
tor.
4-3.23 on page 4-103
05h READ BLOCK LIMITS
Requests the target’s block length limits for the logical
unit.
4-3.15 on page 4-68
08h READ
Transfers zero or more blocks to the initiator beginning
with the next block on the logical unit.
4-3.14 on page 4-63
0Ah WRITE
Transfers zero or more blocks from the initiator to the
current position on the logical unit.
4-3.31 on page 4-140
0Fh
READ REVERSE
(optional) Requests that the tape unit transfer zero or more blocks
of data to the initiator.
4-3.18 on page 4-80
10h WRITE FILEMARKS Requests the write of zero or more filemarks to tape. 4-3.33 on page 4-150
11h SPACE
Changes the logical unit position relative to the current
position.
4-3.29 on page 4-135
12h INQUIRY
Provides a means for an initiator to request information
regarding parameters of the target and any attached
peripheral devices
.
4-3.6 on page 4-18 &
5-3 on page 5-17
14h
RECOVER BUFFERED
DATA (optional)
Requests that the tape unit transfer zero or more blocks
of data from the tape unit’s buffer to the initiator. The
command is used to retrieve data contained in the
buffer that had been sent earlier by the initiator to be
written to the medium [tape].
4-3.21 on page 4-98
15h MODE SELECT
Provides a means for the initiator to specify medium,
logical unit, and peripheral device parameters to the tar-
get by sending data relevant to such parameters in a
data phase during the command.
4-3.12 on page 4-51
& 5-2 on page 5-1
16h RESERVE UNIT
Reserves the specified logical unit for the exclusive use
of the requesting initiator.
4-3.25 on page 4-112
17h RELEASE UNIT
Release previously reserved logical units for the
requesting initiator.
4-3.22 on page 4-101
19h ERASE
Causes part or all of the remaining medium to be erased
beginning from the current logical position.
4-3.5 on page 4-15
1Ah MODE SENSE
Provides a means for the target to report medium, logi-
cal unit, and peripheral device parameters to the initia-
tor by sending data relevant to such parameters in a data
phase during the command.
4-3.13 on page 4-56
& 5-2 on page 5-1