HP Cisco MDS 9222i Cisco MDS 9000 Family Fabric Manager Configuration Guide - - Page 1330

Example Configuration Chapter 64 Configuring Fabric Congestion Control and QoS Send documentation comments to [email protected] Step 3 Select a switch and change the weight. Step 4 Click the Apply Changes icon to save your changes. Example Configuration This section describes a configuration example for the application illustrated in Figure 64-7. Figure 64-7 Example Application for Traffic Prioritization OLTP server 21:00:00:0c:50:02:ca:b5 Disk 22:00:00:04:cf:22:eb:dc FC Congestion Backup server VOQ(s) Absolute VOQ(s) Absolute High High 21:00:00:0c:50:02:c7:ff Medium Medium Low Low 130667 Switch 1 Switch 2 Both the OLTP server and the backup server are accessing the disk. The backup server is writing large amounts of data to the disk. This data does not require specific service guarantees. The volumes of data generated by the OLTP server to the disk are comparatively much lower but this traffic requires faster response because transaction processing is a low latency application. The point of congestion is the link between Switch 2 and the disk, for traffic from the switch to the disk. The return path is largely uncongested as there is little backup traffic on this path. Service differentiation is needed at Switch 2 to prioritize the OLTP-server-to-disk traffic higher than the backup-server-to-disk traffic. To configure traffic prioritization for the example application, follow these steps: Step 1 Step 2 Step 3 Step 4 Step 5 Create the class maps. Create the policy map. Assign the service policy. Assign the weights for the DWRR queues. Repeat Step 1 through Step 4 on Switch 1 to address forward path congestion at both switches. 64-10 Cisco MDS 9000 Family Fabric Manager Configuration Guide OL-17256-03, Cisco MDS NX-OS Release 4.x