DLT4000 SCSI Interface
8-124 DLT4000/DLT4500/DLT4700 Cartridge Tape Subsystem
8.4.25 WRITE (0Ah)
Bit
7
6
5
4
3
2
1
0
0
Operation Code (0Ah)
1
Logical Unit Number
Reserved
Fixed
2
(MSB)
Byte
3
Transfer Length
4
(LSB)
5
Unused
Reserved
Flag
Link
Figure 8-79
WRITE CDB
WRITE transfers one or more blocks from the host to the current logical position.
When in Buffered Mode (see MODE SELECT), the tape drive reports a GOOD status
on WRITE commands as soon as this data block has been transferred to the data
buffer.
The drive flushes the write buffer to tape under the following conditions:
•
The write hold-off time limit is exceeded. (See MODE SELECT command.)
•
Receipt of the following nonwrite commands:
LOAD-UNLOAD
REWIND
ERASE
LOCATE
MOVE MEDIUM
PREVENT/ALLOW MEDIUM REMOVAL that clears a prevent state
•
A Write Filemarks command with the immediate bit cleared.
•
A SCSI Reset or Bus Device Reset a reset message is received
If Buffered Mode is not selected, the buffer will flush after every write-type command.
Buffered Mode can be configured through MODE SELECT, and if it is not used, the
tape drive suffers a significant degradation in performance with respect to transfer rate
and therefore, loss of streaming.
Summary of Contents for DLT 4700
Page 1: ...DLTTM 4000 DLTTM 4500 DLTTM 4700 Cartridge Tape Subsystem Product Manual...
Page 2: ......
Page 160: ...Firmware Update From Tape 7 18 DLT4000 DLT4500 DLT4700 Cartridge Tape Subsystem...
Page 215: ...DLT4000 SCSI Interface DLT4000 DLT4500 DLT4700 Cartridge Tape Subsystem 8 55...
Page 304: ...DLT4000 SCSI Interface 8 144 DLT4000 DLT4500 DLT4700 Cartridge Tape Subsystem...
Page 342: ...Sense Key Information C 6 DLT4000 DLT4500 DLT4700 Cartridge Tape Subsystem...
Page 359: ...Index DLT4000 DLT4500 DLT4700 Cartridge Tape Subsystem 7...
Page 360: ...Index 8 DLT4000 DLT4500 DLT4700 Cartridge Tape Subsystem...