Class-of-Service Overview
Requirements
End-to-end class of service is required in a data center environment to ensure a high quality user experience for users of business-critical applications. The most important or high priority applications and services should always have priority over other traffic types. The other type of class of service required is configuration and support for DCB and the provisioning of Lossless Ethernet to enable communication between storage arrays as a high priority, lossless medium without causing blocking or interruption of non-storage traffic.
End-to-end traffic and CoS in this solution have been classified into the following five forwarding classes (sorted from highest priority to lowest priority, top to bottom):
- Network control traffic
- Virtualization control
- Storage (Llossless)
- Business applications
- Best effort (everything else)
The solution queues (buffers and transmit rates) are shown in Table 1.
Table 1: MetaFabric 1.0 Class-of-Service Queues
Schedulers | Transmit Rate | Loss Priority | Queue |
|---|---|---|---|
Network-control | 5% | High | 111 |
VM_Control | 5% | High | 110 |
Business_Applications | 25% | High | 001 |
no-loss | 60% | Low (PFC enabled) | 100 |
Best-effort. | 5% | High | 000 |
