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e1200-320 4Gb Fibre Channel Interface Card user and service guide 115
Indexed addressing option
Indexed Addressing allows for host bus adapter (HBA) drivers that only use Peripheral Device addressing
to access SCSI devices attached to the interface card. This is done by use of a table, which is indexed by
sequential LUN values, indicating selected BUS:TARGET:LUN devices. It is not possible in this mode to
address the interface card as an interface card unit directly. The table has the structure as shown in
Table 22.
The maximum size of the table is equal to the number of buses times the number of targets per bus, less
one initiator ID per bus, times the number of LUNs per target.
The index table can be manually edited. A method is also provided to perform SCSI device discovery,
and fill the table in the order that SCSI devices are discovered on the SCSI buses.
Table 22 Indexed addressing table
SCC addressing option
When an interface card device is configured to use SCSI interface card Commands (SCC) addressing,
the unit is capable of responding as an interface card device to the FCP Initiator, or routing the FCP
request to a specified BUS:TARGET:LUN. When a request using the Peripheral Device addressing method
is received (an FCP command with the LUN field with bits 7 and 6 of byte 0 are set to 0), the unit routes
the request to the internal processor, which acts on the command directly. When a request using the
Logical Unit addressing method is received (bits 7 and 6 set to 10b), the request is routed to the
BUS:TARGET:LUN as specified in the defined field.
Host systems using SCC addressing will typically do initial device discovery using the Peripheral Device
addressing method. On issuing an INQUIRY command to the interface card, the host will receive the
interface card Inquiry data, indicating the device type as a interface card device (Inquiry data indicates
device type is 0xC). The host will then know, on this basis, that subsequent commands to interface card
attached devices will use the Logical Unit addressing method.
The host can perform discovery by either walking through the BUS:TARGET:LUN values as would a
standard SCSI driver, or by issuing a REPORT LUNS command. This command is sent to the interface card
(using the Peripheral Device addressing method), and the interface card returns a table indicating
FCP LUN Value SCSI BUS:TARGET:LUN
0 0:0:0
10:1:0
20:2:0
30:3:0
40:4:0
50:5:0
60:6:0
(0:7:0 occupied by Initiator ID)
70:8:0
(...) (...)
13 0:14:0
14 0:15:0
15 1:0:0
16 1:1:0
17 1:2:0
(...) (...)