HP StorageWorks 2.140 Director Switch - Manual (Page 93)

Director Element Manager user guide 93
Rerouting delay
To enable rerouting delay, place a check mark in the Rerouting Delay check box. 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 a change to the fabric topology 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 that of a
previous path with a minimum hop count. This may result in frames being delivered to a destination
out of order because 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 box
of the Configure Switch Fabric Parameters dialog box, as shown in Figure 31 on page 91. This
delay allows frames sent on the old path to exit to their destination before new frames begin
traversing the new path.
Domain RSCNs
Domain RSCNs are sent between end devices in a fabric to provide additional connection
information to HBAs 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 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.
Suppress Zoning RSCNs on zone set activations
Fabric format domain 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
contains a check, 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 to suppress RCNs is disabled by default and, in most cases, should remain disabled so
that attached devices can receive notification of zoning changes in the fabric. However, some HBAs
may log out, then log back in to 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.