U42093-J-Z716-1-74 Operating Manual
Configuring the PSFR-CP41 Host Device Configuration
Host Device Configuration
The host systemusing a Fibre Channel Host Bus Adapter (HBA) will typically
map Fibre Channel devicesinto the existing device mapping scheme used by
that operatingsystem. This usually results in the Fibre Channel HBA mapping
Fibre Channel AL_PA’sto SCSI target addresses. The HBA will claim enough
SCSI busentr ies to allowfor 125 Fibre Channel targets to map to SCSI
Bus:Targetentries. This is usually done by a fixed mapping of AL_PAto
Bus:Target.In such a configuration, the PSFR-CP41 corresponds to a
Bus:Targetidentifier, with the SCSI devices attached to the PSFR-CP41
appearingas logical units (LUNs). In addition, operating systems can extend the
availableSCSI limit of 15 per bus.
Althoughthis is not an issue for the operating system or most applications, there
arecases where older applications can have expectations about what are valid
SCSI ID’s,and not deal correctly with certain mappings. In particular, applica-
tionshave been seen to have difficulties addressing target ID’s greater than 15
(e.g.16 and up). Thisproblem can be resolved by configuring the PSFR-CP41
to use hard addressing,and setting the AL_PA used by the unit to a value that
theHBAwillmaptoanIDwithavaluelessthan16.
Forexample, depending on the FC HBA, if the hard AL_PA selection is 1, the
addressis 1. If the selection is 125, the AL_PAaddress is 0xEF.Some FC HBA’s
willconfigure differently, so verify the AL_PAby toggling to hard addressing and
selectingan address.