FW 05.01.00 and SW 07.02.00 hp StorageWorks HA-Fabric Manager User Guide

Optional Features
190 High Availability Fabric Manager User Guide
Rerouting Delay
Rerouting Delay is a parameter in the Configure Switch Parameters dialog box,
available from the Configure menu in the Product Manager application.
Rerouting Delay ensures that frames are delivered through the fabric in order 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 the
paths hop count is less than a previous path with a minimum hop count. This
rerouting 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 (Configure menu). This delay enables frames sent on the
old path to exit to their destination before new frames begin traversing the new
path.
If Enterprise Fabric Mode is enabled, the Rerouting Delay option is automatically
enabled and cannot be disabled unless the director or switch is offline. In this case,
disabling Rerouting Delay also disables Enterprise Fabric Mode.
Domain RSCNs
This is a parameter in the Configure Switch Parameters dialog box, available
from the Configure menu in the Product Manager application. 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.
If Enterprise Fabric Mode is enabled, this parameter is automatically enabled and
cannot be disabled unless the director or switch is offline. In this case, disabling
Domain RSCNs also disables Enterprise Fabric Mode.