HP StorageWorks 64 FW 07.00.00/HAFM SW 08.06.00 McDATA Products in a SAN Envir - Page 110
Zoning, Principal switch selection, Principal, Default, Never Principal, Switch Priority, Never
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Planning Considerations for Fibre Channel Topologies 3 • Zoning - For multiswitch fabrics, zoning is configured on a fabric-wide basis. Changes to the zoning configuration apply to all directors and switches in the fabric. To ensure the zoning configuration is maintained, certain rules are enforced when two or more elements are connected through ISLs to form a fabric or when two or more fabrics are joined. For additional information, refer to Configuring Zones. After directors and fabric switches are defined and cabled, they automatically join to form a single fabric through a user-transparent process. However, the user should be aware of the following fabric concepts, configuration characteristics, and operational characteristics: • Principal switch selection - Setting this value determines the principal switch for the multiswitch fabric. Select either Principal (highest priority), Default, or Never Principal (lowest priority) from the Switch Priority drop-down list. If all fabric elements are set to Principal or Default, the director or fabric switch with the highest priority and the lowest WWN becomes the principal switch. Following are some examples of principal switch selection when fabric elements have these settings. - If you have three fabric elements and set all to Default, the director or switch with the lowest WWN becomes the principal switch. - If you have three fabric elements and set two to Principal and one to Default, the element with the Principal setting that has the lowest WWN becomes the principal switch. - If you have three fabric elements and set two to Default and one to Never Principal, the element with the Default setting and the lowest WWN becomes the principal switch. Note that at least one director or switch in a multiswitch fabric needs to be set as Principal or Default. If all the fabric elements are set to Never Principal, all ISLs will segment. If all but one element is set to Never Principal and the element that was Principal goes offline, then all of the other ISLs will segment. NOTE: It is recommended to configure the switch priority as Default. 3-24 McDATA Products in a SAN Environment - Planning Manual