Specifications

5
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McDATA Products in a SAN Environment - Planning Manual
Physical Planning Considerations
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.