Pdcm Arrays - McDATA StorageWorks 64 - SAN Director Switch Planning Manual

Physical Planning Considerations
5
SANtegrity Binding
Considerations

PDCM Arrays

McDATA Products in a SAN Environment - Planning Manual
5-20
• Rerouting delay - If a fabric topology changes, directors and
fabric switches calculate a new least-cost data transfer path
through a fabric, and routing tables immediately implement that
path. This may result in Fibre Channel frames being delivered to
a destination device out of order, because frames transmitted over
the new (shorter) path may arrive ahead of previously-
transmitted frames that traverse the old (longer) path. When
enabled, the rerouting delay parameter ensures frames are
delivered through a fabric in the correct order.
• Domain RSCNs - Domain registered state change notifications
(RSCNs) provide connectivity information to all host bus
adapters (HBAs) and storage devices attached to a fabric. RSCNs
are transmitted to all registered device N_Ports attached to a
fabric if either a fabric-wide event or zoning configuration change
occurs.
• Insistent Domain_ID - When this parameter is enabled, the
domain identification (Domain_ID) configured as the preferred
Domain_ID for a fabric element becomes the active Domain_ID
when the fabric initializes. A static and unique active domain
identification is required by the fabric binding feature because the
feature's fabric membership list identifies fabric elements by
WWN and Domain_ID. If a duplicate preferred Domain_ID is
used, then insisted upon, a warning occurs and the affected
director or fabric switch cannot be added to the membership list.
Fabric and switch binding enhance data security by controlling and
Planning
monitoring director, fabric switch, and device connectivity. In fact,
installation of the SANtegrity Binding feature is a prerequisite for
configuring a high-integrity, FICON-cascaded SAN.
Use of the SANtegrity Binding feature in conjunction with other
security provisions must be carefully planned and coordinated. For
additional information, refer to
planning assistance from McDATA's professional services
organization before implementing the feature.
PDCM connectivity control is configured and managed at the
director or fabric switch level using the Configure Allow/Prohibit
Matrix - Active dialog box
array in which logical port addresses are allowed or prohibited from
connecting with each other (including E_Port connectivity).
Security Best Practices. Obtain
(Figure 5-4), where the user specifies an