1 HV Installation and Operations Guide

Appendix C SCSI Initiators to Fibre Channel Targets 233

SCSI Initiators to Fibre Channel Targets

SCSI Initiators addressing Fibre Channel targets require that the

bus:target:LUN selected be associated with a given Fibre Channel destination

ID and FCP LUN field. When a command is received on the SCSI bus, the

routing table for that unit is accessed to determine what destination ID, and

thus, what FCP target device to which the command is routed. When the

FCP_CMD is issued, the LUN field associated with that entry is used to provide

the additional LUN addressing behind the FCP target. Further identification in

the later phases of the command processing is by the exchange identifier. The

table used is shown in Table <$elemparanumonly. The table can be manually

edited, for both the loop ID (AL-PA) and LUN field. Two bytes are provided for

the LUN field, so that devices using SCC addressing can be used. In these

cases, the bit fields used must be manually configured.

For example, it may be desirable to address a FCP RAID controller using SCC

volume set addressing. In this case, LUN 0 would be addressed by using the

LUN value 0x4000. Using logical unit addressing, the LUN value would be

0x8000. Similarly, bus 1, target 2, LUN 3 would be represented as 0x8243.

Table 26 SCSI to FCP Routing Table

SCSI Address FC Address

SCSI Bus 0, Target 0, LUN 0 Loop ID 0, LUN 0x0000

SCSI Bus 0, Target 1, LUN 0 Loop ID 1, LUN 0x0000

SCSI Bus 0, Target 2, LUN 0 Loop ID 2, LUN 0x0000

(...) (...)

SCSI Bus 0, Target 0, LUN 0 Loop ID 16, LUN 0x0000

SCSI Bus 0, Target 1, LUN 0 Loop ID 17, LUN 0x0000

SCSI Bus 0, Target 2, LUN 0 Loop ID 18, LUN 0x0000

(...) (...)

SCSI Target 7 Unavailable (Bridge Initiator ID)