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SCSI Commands
5-118
Quantum DLT 4000 Tape Drive
READ Command (08h) (continued)
Table 5–56 READ Command Descriptor Block - Field Descriptions
Field Name Description
SILI
Suppress Incorrect Length Indicator. If the SILI bit is set to 1 and the Fixed bit is set to
1, the target terminates the command with CHECK CONDITION status, sense key set to
ILLEGAL REQUEST, and additional sense code of INVALID FIELD IN CDB.
If the SILI bit is 0 and the actual block length is different than the specified transfer
length, a CHECK CONDITION status is returned. Within the sense data, the Incorrect
Length Indicator (ILI) bit and Valid bit will be set to 1. The sense key field specifies NO
SENSE. The information bytes are set to the difference (residue) between the requested
transfer length and the actual block length, or, in Fixed Block mode, the difference
(residue) between the requested number of blocks and the actual number of blocks
read. No more than transfer length blocks are transferred to the initiator and the tape
is logically positioned after the block (EOM side).
Fixed
This bit specifies whether fixed-length or variable-length blocks are to be transferred,
and gives meaning to the Transfer Length field of the READ command.
When set to 0, variable-block mode is requested. A single block is transferred with the
Transfer Length specifying the maximum number of bytes the initiator has allocated
for the returned data.
When the Fixed bit is set to 1, the Transfer Length specifies the number of blocks to be
transferred to the initiator. This is valid only if the logical unit is currently operating in
Fixed Block mode.
When the Transfer Length is 0, no data is transferred and the current position on the
logical unit does not change. This is not an error condition.
A successful READ with Fixed bit set to 1 transfers (current block length) x (# of
blocks x block size) bytes of data to the host. Upon termination of READ, the medium
is logically positioned after the last block of data transferred (EOM).
Summary of Contents for DLTtape DLT 4000
Page 1: ...DLT 4000 Tape Drive Product Manual November 10 2003 81 60043 04 ...
Page 5: ...USER MANUAL STATEMENTS FOR CLASS B EQUIPMENT continued ...
Page 6: ......
Page 24: ...About This Manual Quantum DLT 4000 Tape Drive xxiv ...
Page 62: ...Hardware Implementation 2 28 Quantum DLT 4000 Tape Drive ...
Page 100: ...Messages 4 12 Quantum DLT 4000 Tape Drive ...
Page 264: ...SCSI Commands 5 164 Quantum DLT 4000 Tape Drive ...
Page 274: ...Appendix B EEPROM Resident Bugcheck and Event Logs B 6 Quantum DLT 4000 Tape System ...
Page 280: ...Appendix C Updating the Firmware C 6 Quantum DLT 4000 Tape Drive ...
Page 298: ...Index Index 6 Quantum DLT4000 Tape Drive ...
Page 299: ......