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ATTO Technology, Inc.
Tunnel CDB (ATTO FibreBridge 3100R and 3200R)
The Tunnel CDB command is a 16 byte Vendor Unique command which allows any 6 or 10 byte CDB to be
tunneled through the FibreBridge LUN to a device residing at a different LUN address. This capability is useful for
accessing SCSI devices when they are not known to the host. The Tunnel CDB can only be issued to the ATTO
FibreBridge device, which, in turn, issues the tunneled CDB to the lun specified in the tunnel CDB.
Bit
7
Byte
0
1
MSB
2
3
4
5
6
7
8
9
10
11
12
13
14
15
The Level 1 LUN field contains the 16-bit logical unit number of the device to which the tunneled command is to be
sent. This field should be set to bytes 0 (MSB) and 1 (LSB) of the LUN addresses returned by the REPORT LUNS
command.
The Tunneled CDB bytes contain the Command Descriptor Block being tunneled to the device. The length of the
Tunneled CDB is determined by examining the Group Code field of the operation code in Tunneled CDB Byte 0.
A tunnel CDB not addressed to the ATTO FibreBridge LUN results in a CHECK CONDITION with a sense key of
ILLEGAL REQUEST and additional sense code of INVALID COMMAND OPCODE.
6
5
4
Operation Code (0x9A)
Level 1 LUN
Tunneled CDB Byte 0
Tunneled CDB Byte 1
Tunneled CDB Byte 2
Tunneled CDB Byte 3
Tunneled CDB Byte 4
Tunneled CDB Byte 5
Tunneled CDB Byte 6
Tunneled CDB Byte 7
Tunneled CDB Byte 8
Tunneled CDB Byte 9
Control Byte
ATTO Technology, Inc.
ATTO FibreBridge Software Manual
3
2
Reserved
Reserved
Available on firmware versions 1.1 and higher
44
-
-
1
0
LSB
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