Example Configuration - HP Cisco MDS 9020 - Fabric Switch Configuration Manual

Example Configuration

S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
Example 56-10 Displays the Class Map Associated with a Specified Interface
switch# show qos service policy interface fc3/10
qos policy-map pmap1
class cmap3
class cmap4
Example 56-11 Displays QoS Statistics
switch# show qos statistics
Total number of FC frames transmitted from the Supervisor= 301431
Number of highest-priority FC frames transmitted
Current priority of FC control frames = 7
Example Configuration
This section describes a configuration example for the application illustrated in
Figure 56-3
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:
Cisco MDS 9000 Family CLI Configuration Guide
56-12
priority high
priority low
Example Application for Traffic Prioritization
21:00:00:0c:50:02:ca:b5
VOQ(s)
Absolute
High
Medium
Low
Switch 1
Chapter 56 Configuring Fabric Congestion Control and QoS
= 137679
(0 = lowest; 7 = highest)
22:00:00:04:cf:22:eb:dc
Congestion
VOQ(s)
Absolute
High
Medium
Low
Switch 2
OL-16184-01, Cisco MDS SAN-OS Release 3.x
Figure 56-3.
Disk
FC FC