User guide

© 2011 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Cisco Validated Design Page 63
5.2.1 QOS and COS in Cisco Unified Computing System
Cisco Unified Computing System provides different system classes of service to implement quality of service
including:
●
System classes that specify the global configuration for certain types of traffic across the entire system
●
QoS policies that assign system classes for individual vNICs
●
Flow control policies that determine how uplink Ethernet ports handle pause frames.
Applications such as the Cisco Unified Computing System and other time sensitive applications have to adhere to
a strict QOS for optimal performance.
5.2.2 System Class Configuration
Systems Class is the global operation where the entire system interfaces have defined QoS rules.
●
By default the system has Best Effort Class and FCoE Class.
◦ Best effort is equivalent in MQC terminology as ―match any‖
◦ FCoE is special Class define for FCoE traffic. In MQC terminology ―match cos 3‖
●
System class allowed with four or more users define class with following configurable rules.
◦ CoS to Class Map
◦ Weight: Bandwidth
◦ Per-class MTU
◦ Property of Class (Drop v/s no drop)
●
Maximum MTU per class allowed is 9216.
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Using the Cisco Unified Computing System, we can map one CoS value to particular class.
●
Apart from FCoE class there can be only one more class can be configured as no-drop property.
●
Weight can be configured based on 0 to 10 numbers. Internally system will calculate the bandwidth based
on following equation (there will be rounding off the number).
(Weight of the given priority * 100)
 % b/w shared of given Class = ________________________________
Sum of weights of all priority
5.2.3 Cisco UCS System Class Configuration
The Cisco Unified Computing System defines user class names as follows.
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Platinum
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Gold
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Silver
●
Bronze
Name Table Map Between Cisco Unified Computing System and Cisco NX-OS Software
Cisco UCS Names
Cisco NX-OS Names
Best effort
Class-default
Fibre Channel
Class-fc
Platinum
Class-Platinum
Gold
Class-Gold
Silver
Class-Silver
Bronze
Class-Bronze