Example Configuration - HP Cisco MDS 9216 - Fabric Switch Configuration Manual

Example Configuration

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Step 4
Example Configuration
This section describes a configuration example for the application illustrated in
Figure 66-7
OLTP server
Backup server
21:00:00:0c:50:02:c7:ff
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 Create the class maps.
Step 2 Create the policy map.
Step 3 Assign the service policy.
Assign the weights for the DWRR queues.
Step 4
Repeat
Step 5
Congestion could occur anywhere in the example configuration. To address congestion of the return path
at both switches, you need to create two more class maps and include them in the policy map as follows:
Cisco MDS 9000 Family CLI Configuration Guide
66-10
Example Application for Traffic Prioritization
21:00:00:0c:50:02:ca:b5
VOQ(s)
Absolute
High
Medium
Low
Switch 1
Step 1 through Step 4 on Switch 1 to address forward path congestion at both switches.
Chapter 66 Configuring Fabric Congestion Control and QoS
Disk
22:00:00:04:cf:22:eb:dc
FC FC
Congestion
VOQ(s)
Absolute
High
Medium
Low
Switch 2
OL-16184-01, Cisco MDS SAN-OS Release 3.x
Figure 66-7.