HP Surestore Tape Library Model 20/700 HP Surestore Bridge FC 2/1 LV and FC 4/ - Page 231

SCSI Initiators to Fibre Channel Targets, SCSI Address

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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

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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)