HP StorageWorks 2.140 Director Switch - Manual (Page 208)

Optional Features
206 Director Element Manager User Guide
Domain RSCNs
This is a parameter in the Configure Switch Parameters dialog box, available from
the Configure menu in the Element Manager. 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 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.
Suppress Zoning RSCNs on Zone Set Activations
Fabric format domain register for state change notifications (RSCNs) are sent to
ports on the switch following any change to the fabric's active zone set. These
changes include activating and deactivating the zone set or enabling and disabling
the default zone. When the Suppress Zoning RSCNs on Zone Set Activations
check box is selected, fabric format RSCNs are not sent for zone changes to the
attached devices on the switch. Click the check box to remove or add a check
mark.
This option is disabled (check box not selected) by default. In most cases this
option should be disabled so that attached devices can receive notification of
zoning changes in the fabric. However, some HBAs may log out, then log back
into the fabric when they receive an RSCN, thereby disrupting Fibre Channel
traffic. Consult with your HBA and storage device vendor to determine if
disabling this option (and thereby enabling RSCN transmission) will cause
problems with your HBA or storage products.