Host Device Configuration 6-5
Host Device Configuration
The host system using a Fibre Channel Host Bus Adapter
(HBA) will typically map Fibre Channel devices into the
existing device mapping scheme used by that operating
system. This usually results in the Fibre Channel HBA
mapping Fibre Channel AL_PA’s to SCSI target addresses.
The HBA will claim enough SCSI bus entries to allow for 125
Fibre Channel targets to map to SCSI Bus:Target entries. This
is usually done by a fixed mapping of AL_PA to Bus:Target.
In such a configuration, the FCR200 corresponds to a
Bus:Target identifier, with the SCSI devices attached to the
FCR200 appearing as logical units (LUNs). In addition,
operating systems can extend the available SCSI limit of 15 per
bus.
Although this is not an issue for the operating system or most
applications, there are cases where older applications can
have expectations about what are valid SCSI ID’s, and not deal
correctly with certain mappings. In particular, applications
have been seen to have difficulties addressing target ID’s
greater than 15 (e.g. 16 and up). This problem can be resolved
by configuring the FCR200 to use hard addressing, and setting
the AL_PA used by the unit to a value that the HBA will map
to an ID with a value less than 16.
For example, depending on the FC HBA, if the hard AL_PA
selection is 1, the address is 1. If the selection is 125, the
AL_PA address is 0xEF. Some FC HBA’s will configure
differently, so verify the AL_PA by toggling to hard
addressing and selecting an address.
Device Management
The FCR200 can be managed through the RS-232 port, over
Ethernet via Telnet, or via SNMP. FTP and TFTP are also
supported for firmware downloads.
Serial
The serial port allows for configuration of all device
characteristics.
