Virtual TapeServer SCSI-to-FC Adapter User Manual

7-12
Chapter 7: Using the Serial/Telnet Interface
• Select 1 to enter a new value for the World Wide Name High. Ordinarily, this value should not
be changed.
• Select 2 to enter a new value for the World Wide Name Low. Ordinarily, this value should not
be changed.
• Select 3 to change the Toggle Port Mode between Auto Sense, N_Port, and Hard ALPA Usage.
The default setting is Auto Sense mode. In this mode, the VT5900-SA FC port tries to come
up as a loop and if not successful then tries to come up as a fabric. If the port comes up as a
loop, it then determines whether it’s on a private or public loop. In N_Port mode, the FC port
skips trying to come up as a loop and instead tries coming up as a fabric only. If the VT5900-
SA is on a loop and N_Port mode is selected, an error in communication may occur. If Hard
ALPA Usage is selected, a unique one-byte valid value (derived from an Arbitrated Loop
Topology as defined in ANSI specification FC_AL ver 4.5) is used for the Fibre Channel
configuration. When configuring the Fibre Channel AL_PA, the VT5900-SA presents a list of
loop addresses along with the corresponding AL_PA. From here, the user can select the loop
address desired.
• Select 4 to set the Hard AL_PA Value by entering a node number from the AL_PA lookup
table that appears when this option is selected. For more information, see Table C-5 in
“Appendix C, Addressing, Structures and Operations”.
• Select 5 to toggle the Discovery Mode among the following options:
Auto Discovery on Reboot Events
Auto Discovery on Link Up Events
Manual Discovery Only
Discovery Mode determines how the VT5900-SA will discover new FC devices.
Auto Discovery allows the VT5900-SA to automatically discover all Fibre Channel devices
when the VT5900-SA reboots.
– Reboot Events discovers both the ports and the devices behind the ports.
Note: Resetting factory defaults overwrites any value a user has previously
manually entered for the WWN Name.
Note: Resetting factory defaults overwrites any value a user has previously
manually entered for the WWN Name.