HP StorageWorks 2.64 Director Switch - Manual (Page 93)

Director Element Manager user guide 93
When a check mark displays, the domain ID configured in the Preferred Domain ID field will
become the active domain identification when the fabric initializes. See the following notes:
• This option is required if Enterprise Fabric Mode (optional SANtegrity Binding feature) is
enabled.
• If you enable Insistent Domain while the switch or director is online, the preferred domain ID
will change to the current active domain ID if the IDs are different.
CAUTION: If a director with a duplicate domain ID exists in the fabric, both directors' E_Ports will
segment when they try to join.
Rerouting Delay
Placing a check mark in the check box to the left of the Rerouting Delay option enables rerouting
delay. This option is only applicable if the configured director is in a multiswitch fabric. The default
state is disabled.
Enabling the rerouting delay ensures that frames are delivered in order through the fabric to their
destination. If there is a change to the fabric topology that creates a new path (for example, a new
switch is added to the fabric), frames may be routed over this new path if its hop count is less than
a previous path with a minimum hop count. This may result in frames being delivered to a
destination out of order since frames sent over the new, shorter path may arrive ahead of older
frames still in route over the older path.
If rerouting delay is enabled, traffic ceases in the fabric for the time specified in the E_D_TOV field
of the Configure Fabric Parameters dialog box. This delay allows frames sent on the old path to
exit to their destination before new frames begin traversing the new path.
Note that this option is required if Enterprise Fabric Mode (optional SANtegrity Binding feature) is
enabled.
Domain RSCNs
Domain register for state change notifications (domain RSCNs) are sent between end devices in a
fabric to provide additional connection information to host bus adapters (HBA) and storage
devices. As an example, this information might be that a logical path has been broken because of
a physical event, such as a fiber optic cable being disconnected from a port. Consult with your
HBA and storage device vendor to determine if enabling domain RSCNs will cause problems with
your HBA or storage products. For example, some hardware bus adapters (HBAs) may log out,
then log back into the fabric when they receive an RSCN, thereby disrupting Fibre Channel traffic.
NOTE: This option is required if Enterprise Fabric Mode (optional SANtegrity Binding feature) is
enabled.