HP StorageWorks 64 FW 07.00.00/HAFM SW 08.06.00 McDATA Products in a SAN Envir - Page 226
PDCM Arrays
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Physical Planning Considerations 5 SANtegrity Binding Planning Considerations • 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 previouslytransmitted 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 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 Security Best Practices. Obtain planning assistance from McDATA's professional services organization before implementing the feature. PDCM Arrays PDCM connectivity control is configured and managed at the director or fabric switch level using the Configure Allow/Prohibit Matrix - Active dialog box (Figure 5-4), where the user specifies an array in which logical port addresses are allowed or prohibited from connecting with each other (including E_Port connectivity). 5-20 McDATA Products in a SAN Environment - Planning Manual