HP StorageWorks 2.64 Director Switch - Manual (Page 165)

Director Element Manager user guide 165
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.
Insistent Domain Identification (ID)
This is a parameter in the Configure Switch Parameters dialog box, available from the Configure
menu in the Element Manager. Enabling this option sets the domain ID configured in the Preferred
Domain ID field in the Configure Switch Parameters dialog box as the active domain identification
when the fabric initializes. A static and unique domain identification is required by the Fabric
Binding feature because the feature's Fabric Membership List identifies switches by WWN and
domain ID. If a duplicate preferred domain ID is used, then insisted, warnings occur when directors
and switches are added to a Fabric Membership List.
If Fabric Binding or Enterprise Fabric Mode is enabled, this option is automatically enabled and
cannot be disabled unless these options are disabled when the director or switch is offline. If the
director or switch is online, disabling Insistent Domain ID will disable Enterprise Fabric Mode and
Fabric Binding.
Open trunking
Interswitch links (ISLs) connect ports between E_Ports on Fibre Channel switches and link these
switches into a multiswitch fabric. Multiple ISLs may be connected between the switches in the
fabric. Data from an attached end device (server or storage) flows through these ISLs to a target
end-device connected to a switch somewhere in the fabric. A data flow is data received from a
specified receive port that is destined for a port in a specified target domain (switch). The list of ISLs
that are candidates for being rerouted (to or from) is derived from the fiber shortest path first (FSPF)
algorithm.
The Open Trunking feature monitors the average data rates of all traffic flows on ISLs (from a
receive port to a target domain), and periodically adjusts routing tables to reroute data flows from
congested links to lightly loaded links and optimize bandwidth use. The objective of Open Trunking