For HP 9000 and HP Integrity servers, you can set the domain IDs before building the
multiswitch fabric and before rezoning.
To decide when to set your HP 9000 and HP integrity host domain IDs, consider the following
scenarios:
- When two active switches are joined, they determine whether the domain ID is already in use. If
there is a conflict, it cannot be changed in an active switch. A conflict causes an active switch to
fail.
- The domain ID identifies switch ports when you implement zoning using the domain and switch port
number. If domain IDs are negotiated at every fabric startup, there is no guarantee that switch IDs
can persist from one session to the next. If the switch ID changes, any zoning definitions are no
longer valid.
- If the domain ID is changed after a SAN is set up, the host can have difficulty logging back in
to the switch, and you might have to reconfigure the host configuration or detect devices on the
switch again.
- Do not use domain ID 8. Domain ID 8 limits the HP-UX host to private loop devices. If
domain ID 8 is used, the HP-UX host is not able to detect the
system.