Fairness in Data Center

In: Computers and Technology

Submitted By tasound
Words 1232
Pages 5
1.1
Convergence
Data centers use different network fabrics to meet the quality of service require- ments of different workload types. There are three main workload types, namely, general networking traffic, storage traffic, and inter-processor traffic. General net- working traffic is handled by Ethernet, storage traffic is handled by Fibre Channel
(FC), and inter-processor traffic is handled by Infiniband (IB). Each network fabric is designed to meet the throughput and latency requirements of its workload. Gen- eral networking traffic is very mixed and includes web traffic along with email and socket applications, so there are few quality of service requirements. Storage traffic between storage devices and servers requires high I/O rates, high capacity and non- disruptive data delivery. Inter-processor traffic requires low latency. General network traffic does not have stringent latency requirements and is not drastically impacted by packet loss. Storage and inter-processor traffic have low latency requirements and require guaranteed delivery of packets. Figure 1-1 shows an example of a converged datacenter. Unfortunately there is a major down-side to having several fabrics in a single data
1Figure 1-1: Converged Datacenter center. There is a high cost to managing and maintaining the various fabrics in a data center. Having several fabrics in a single data center results in high heat generation due to additional heat generating hardware as well as reduced air flow, so cooling costs are high. The cost of purchasing different types of equipment for each technology is high. Furthermore, staff with various skills and expertise are needed to maintain the different fabrics, so technical and management costs rise. As a result, there is a move to using the same fabric for transmitting different workloads. The fabric must be partitioned into virtual…...

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