HP StorageWorks Fabric OS 6.x administrator guide (5697-7344, March 2008)
380 Administering ISL Trunking
There are three methods of monitoring fabric traffic:
• Advanced Performance Monitoring monitors traffic flow and allows you to view the impact of different
fabric configurations on performance. See ”Administering Advanced Performance Monitoring” on
page 361 for additional information.
• Fabric Watch allows you to monitor traffic flow through specified ports on the switch and send alerts
when the traffic exceeds or drops below configured thresholds. See the Fabric Watch Administrator’s
Guide for additional information.
• Use the portPerfShow command as described in the following procedure to record traffic volume for
each port in your fabric over time.
To use the portPerfShow command:
1. Connect to the switch and log in as admin.
2. Enter the following command:
portperfshow [interval]
where interval is the number of seconds between each data-gathering sample (the default is one
sample every second).
3. Record the traffic flow for each port participating in an ISL.
4. Repeat step 1 through step 3 for each switch in the fabric until all ISL traffic flow is captured.
In a large fabric, it may be necessary to only identify and capture the key ISLs. However, you may want
to continue this process throughout the day (or an entire work cycle), to capture varying traffic patterns
under different conditions.
The following example shows a switch without trunking, and indicates that ports 0 through 2 are under
utilized and ports 4 and 5 are congested:
switch:admin> portperfshow
0 1 2 3 4 5 6 7 Total
--------------------------------------------------------------------
0 0 0 145m 204m 202m 0 168m 719
0 0 0 145m 206m 208m 0 186m 745
The following example shows traffic flowing through a trunking group (ports 5, 6, and 7). After port 6 fails,
traffic is redistributed over the remaining two links in the group, ports 5 and 7:
switch:admin> portperfshow
0 1 2 3 4 5 6 7 Total
--------------------------------------------------------------------
0 0 0 0 0 145m 144m 145m 434
0 0 0 0 0 144m 143m 144m 431
0 0 0 0 0 162m 0 162m 324
0 0 0 0 0 186m 0 186m 372
0 0 0 0 0 193m 0 192m 385
0 0 0 0 0 202m 0 202m 404
0 0 0 0 0 209m 0 209m 418