FW V06.XX/HAFM SW V08.02.00 HP StorageWorks CLI Reference Guide for Directors and Edge Switches Reference Guide (AA-RQ7AE-TE, July 2004)

perf.openTrunking.unresCongestion
169CLI Reference Guide for Directors and Edge Switches
perf.preferredPath
The perf.preferredPath commands enable you to use the Preferred Path feature to
influence the route of data traffic that traverses multiple switches or directors in a
fabric. If more than one ISL connects switches in your SAN, this feature is useful
for specifying an ISL preference for a particular flow.
The Preferred Path feature allows the user to enhance the system’s path selection
algorithm by providing the ability to prioritize ISLs for a selected port on the
switch. The Preferred Path capability customizes the static load-balancing
function by allowing the user to specify an ISL preference for each remote
domain. Preferred Path, however, is still subject to the standard Fabric Shortest
Path First (FSPF) requirements, which allow the firmware to override the
configuration setting if errors are encountered.
The data path consists of the source port of the switch or director being
configured, the exit port of that switch or director, and the domain ID of the
destination switch or director. Each switch or director must be configured for its
part of the desired path in order to achieve optimal performance. You may need to
configure Preferred Paths for all switches or directors along the desired path for a
proper multi-hop Preferred Path. (For examples of Preferred Path implementation
and other related information, see your product’s Element Manager manual.)
■ The following rules apply when configuring Preferred Paths:
■ The switch’s domain ID must be set to insistent.
■ Domain IDs must be in the range of 1 through 31.
■ The specified numbers for source ports and exit ports must be in the range
equal to the number of ports for the switch being configured.
■ For any source port, only one path may be defined to each destination domain
ID.
Note: For E/OS 6.0 only, the Preferred Path feature key must be installed to use
preferred path commands. For E/OS 6.1, a feature key is not required.