HP StorageWorks 2/140 FW 08.01.00 McDATA Products in a SAN Environment Plannin - Page 109
Path selection, For the Intrepid 10000 Director and Eclipse-series SAN
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Planning Considerations for Fibre Channel Topologies 3 If two operational fabrics join, they determine if any Domain_ID conflicts exist between the fabrics. If one or more conflicts exist, the interconnecting ISL E_Ports segment to prevent the fabrics from joining. To prevent this problem, it is recommended that all directors and switches be assigned a unique preferred Domain_ID. This is important if zoning is implemented through port number (and by default Domain_ID) rather that WWN. When assigning preferred Domain_IDs in an open fabric with directors and switches supplied by multiple OEMs, be aware of the following: - For Intrepid 6000-series directors and Sphereon-series fabric switches, the firmware adds a base offset of 96 (hexadecimal 60) to the numerically-assigned preferred Domain_ID. Therefore, if a user assigns a director or switch a numerical preferred Domain_ID of 1, the firmware assigns a hexadecimal Domain_ID of 61. - For the Intrepid 10000 Director and Eclipse-series SAN routers, the firmware does not add a base offset to the numerically-assigned preferred Domain_ID. - For non-McDATA directors and switches, the product firmware may not add a base offset to the numerical preferred Domain_ID or may add a different hexadecimal base offset (not 60). As a consequence of this variable base offset and hexadecimal conversion, Domain_ID conflicts may exist in an open fabric, even if each participating director and switch is assigned a unique numerical Domain_ID. To determine the method of preferred Domain_ID assignment for a product, refer to the supporting OEM publications for the product or contact McDATA. NOTE: Do not assign Domain_ID 30 or Domain_ID 31 to a fabric element. In a routed SAN, these proxy Domain_IDs are assigned to routing domains. • Path selection - Directors and fabric switches are not manually configured with data transmission paths to each other. Participating fabric elements automatically exchange information to determine the fabric topology and resulting minimum-hop data transfer paths through the fabric. These paths route Fibre Planning Considerations for Fibre Channel Topologies 3-25