Siemens PSFR-CP41 - Manual (Page 65)

Operating Manual U42093-J-Z716-1-74
SCC Addressing Option Appendix B
SCC Addressing Option
When the PSFR-CP41 is configured to use SCC addressing, the unit is capable
of responding as a controller device to the FCP Initiator, or routing the FCP
request to a specified BUS:TARGET:LUN triplet. 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 PSFR-CP41, 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, the host will receive the PSFR-CP41 inquiry data (Appendix C, Table
2), indicating the device type as a controller device. The host will then know on
this basis that subsequent commands to 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 (Appendix B). This command is sent to the
controller (using the Peripheral Device Addressing Method), and returns a table
indicating attached devices. The host can then perform actions on these
devices directly without having to perform discovery through all possible combi-
nations.