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DLT2000 SCSI Interface
DLT2000/DLT2700 Cartridge Tape Subsystem 8-129
8.4.27 WRITE FILEMARKS (10h)
Bit
7
6
5
4
3
2
1
0
0
Operation Code (10h)
Logical Unit Number
Reserved
WSmk
Immed
Byte
(MSB)
(LSB)
Unused
Flag
1
Number of Filemarks
Link
2
Reserved
3
4
5
Figure 8-82 WRITE FILEMARKS CDB
WRITE FILEMARKS causes the specified number of Filemarks to be written
beginning at the current logical position on tape. If the Immed bit is not set, any data or
Filemarks in the write cache buffer are written to tape. Upon a Bus Reset or when a Bus
Reset message is received, the cached blocks or filemarks are flushed to the tape.
WSmk
If this bit is set, the tape drive writes a save-set mark to tape instead of a Filemark.
Since Setmarks are not supported by the DLT2000, this field must be zero.
Immed
If this bit is set, the drive returns status as soon as the command descriptor block has
been validated, unless the filemark count is zero, or greater than 1 (since both cause the
write buffer to be flushed to media). An Immed bit of zero indicates the status will not
be returned until the operation is complete.
Number of Filemarks
This is the number of consecutive marks to be written to tape. A value of zero is not
considered an error and GOOD status is returned.
This command may be used to force the drive to write any buffered write data to the
tape. If the drive is in Buffered mode, and WRITE FILEMARKS is received, the
requested Filemarks are appended to the data, and the write buffer is flushed to tape. A
zero value in the Number of Filemarks field indicates that no Filemarks are to be
written to the tape, but still flushes any write data to tape.
If EOT is detected while writing Filemarks, the drive finishes writing any buffered data
and terminates with CHECK CONDITION status. Within the Sense data, the EOM bit
is set, the Sense Key field is set to NO SENSE and the Additional Sense Code and
Summary of Contents for DLT 2500
Page 18: ...Table of Contents xviii DLT2000 DLT2500 DLT2700 Cartridge Tape Subsystem ...
Page 20: ...Revision History xx DLT2000 DLT2500 DLT2700 Cartridge Tape Subsystem ...
Page 146: ...Firmware Update From Tape 7 18 DLT2000 DLT2500 DLT2700 Cartridge Tape Subsystem ...
Page 291: ...DLT2000 SCSI Interface DLT2000 DLT2700 Cartridge Tape Subsystem 8 145 ...
Page 327: ...Sense Key Information C 6 DLT2000 DLT2500 DLT2700 Cartridge Tape Subsystem ...
Page 345: ...Index 8 DLT2000 DLT2500 DLT2700 Cartridge Tape Subsystem ...