Siemens PSFR-CP41 - Manual (Page 37)

U42093-J-Z716-1-74 Operating Manual
Understanding the PSFR-CP41 Configuration Auto Addressing
Auto Addressing
The Auto Addressing option is similar to Indexed Addressing, but with the
distinction that the table used is created through SCSI device discovery upon
power up or reset, and not otherwise retained. As the unit performs device
discovery on the SCSI bus, the Index table is filled with adjacent FCP LUNs
referencing each subsequent SCSI device. The host system will then detect
every attached device without voids, allowing full device discovery to the host.
This allows easy configuration in environments where device ordering is not
important, and hot plugging of SCSI devices will not occur. Configuration allows
for discovery to be performed in order of target or LUN, as desired for the
specific environment.
Auto Addressing, target mode is configured as the default mode of the PSFR-
CP41.
SCC Addressing
The PSFR-CP41 implements the SCSI-3 Controller Commands (SCC) (X3T10
Project 1047D Revision 6b 01-July-96) SCSI storage array addressing to
address SCSI devices attached to the PSFR-CP41. The Access Method used
is the SCC Logical Unit Addressing method.
In SCC Addressing mode, the PSFR-CP41 will respond to FCP commands, as
in a SCC controller device. A subset of the SCC behavior is implemented. LUN
mappings corresponding to the SCC Peripheral Device Addressing are inter-
preted as controller commands, and are acted on by the PSFR-CP41 directly.
LUN mappings using SCC Logical Unit addressing are routed to the appropriate
SCSI BUS:TARGET:LUN and processed accordingly.
Further description of the PSFR-CP41 implementation of SCC addressing is in
Appendix B.