HP StorageWorks 2/24 FW 07.00.00/HAFM SW 08.06.00 McDATA Products in a SAN Env - Page 230

Physical Planning Considerations 5 A preferred path is configured between a source server and destination device (A or B), traversing Director 1, Director 2, and Director 3. To configure the preferred path through the first director: 1. Select the Preferred Path option from the Element Manager application's Configure menu. The Configure Preferred Paths dialog box displays. 2. Click Add. The Add Preferred Path dialog box displays (bottom of Figure 5-6). 3. For the director entry port, type 14 in the Source Port field. For the director exit port, type 45 in the Exit Port field. For the destination device (Director 3), type 22 in the Destination Domain_ID field. 4. Click OK to save the path configuration and close the dialog box. This procedure only specifies that data enters and exits Director 1 through specific ports on the path to Director 3. The procedure must be repeated at the second director as follows: 1. Select the Preferred Path option from the Element Manager application's Configure menu. The Configure Preferred Paths dialog box displays. 2. Click Add. The Add Preferred Path dialog box displays (top of Figure 5-6). 3. For the director entry port, type 11 in the Source Port field. For the director exit port, type 21 in the Exit Port field. For the destination device (Director 3), type 22 in the Destination Domain_ID field. 4. Click OK to save the path configuration and close the dialog box. Activating a preferred path can result in receipt of out-of-order frames (especially in FICON environments) if the path differs from the current path, if input and output (I/O) is active from the source port, and if congestion is present on the path. To avoid problems in FICON environments, vary associated channel path identifiers (CHPIDs) temporarily offline, configure the preferred path, and vary the CHPIDs back online. 5-24 McDATA Products in a SAN Environment - Planning Manual