HP StorageWorks M2402, User Manual

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Addressing Methods and Table Structures
219 Network Storage Router M2402 User Guide
Auto Assigned Addressing Method
The Auto Assigned addressing method is created through SCSI device discovery
on power up or reset. As the router performs device discovery on the SCSI bus,
the index table FCP LUN values are filled with adjacent FCP LUN referencing
each subsequent SCSI device. The index table generated by the Auto Assigned
option cannot be manually edited.
When the Auto Assigned option is used, the host system will detect every attached
SCSI device without voids, allowing full device access to the host. This method
allows easy configuration in environments where SCSI device ordering is not
important and where hot plugging of SCSI devices will not occur. For example,
tape libraries are excellent candidates for using Auto Assigned Addressing.
Configuration options provide for the SCSI discovery to be performed in order of
bus, target, or LUN as desired for the specific environment.
Indexed Addressing Method
Indexed addressing allows for host bus adapter (HBA) drivers that use only
Peripheral Device Addressing to access SCSI devices attached to the router. This
addressing is done by use of a table, which is indexed by sequential LUN values,
indicating the selected BUS:TARGET:LUN devices. In this mode, it is not
possible to address the router as a controller unit directly.
The maximum size of the table is equal to the number of buses multiplied by the
number of targets per bus less one Initiator ID per bus, multiplied by the number
of LUNs per target. The index table can be manually edited. A method is also
provided to perform SCSI device discovery and fill the index table.
See Table 23 for the Indexed addressing table.