Fibre Channel Initiators Addressing Scsi Targets - Quantum Scalar 218FC User Manual

Fibre Channel Initiators Addressing SCSI
Targets
When a Fibre Channel initiator initializes on a loop, it must first determine what devices exist on the loop
and build an FCP target device list. Each device is queried for FCP logical units. The logical units are the
actual devices that the operating system will address. When an initiator addresses a logical unit, the LUN
field used is consistent in form with the SCSI CC defined fields. All current Fibre Channel host bus adapter
drivers are consistent with these methods. The addressing used is the SCC Logical Unit Addressing and
Peripheral Device Addressing methods, shown in Table 1 through 4. First level addressing is supported, so
only the first 2 bytes of the 8 byte FCP LUN are used.
Bit 7
Byte
n
Address Method
N+1
Codes
Bit 7
Byte
n
1
N+1 Bus
6 5 4
Address Method Specific
SCC Addressing Structure
Description
00
Peripheral Device Addressing Method
01
Volume Set Addressing Method
10
Logical Unit Addressing Method
11
Reserved
Address Method Definitions
6 5 4
0
SCC Logical Unit Addressing
3 2
Address Method Specific
3 2
Target
LUN
FC to SCSI Mapping
1 0
1 0
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