Microsoft_Press_ebook_Introducing_Windows_Server_2012_R2_PDF.pdf

Virtual rss chapter 5 89 figure 5 1 virtual receive

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Virtual RSS CHAPTER 5 89 FIGURE 5-1 Virtual Receive Side Scaling (vRSS) is available in Windows Server 2012 R2. The result of using vRSS is that it is now possible to virtualize network-intensive physical workloads that were traditionally run on bare-metal machines. A typical usage scenario might be a Hyper-V host that has a small number or only one virtual machine running on it, but the applications running in that virtual machine generate a large amount of network traffic. For example, vRSS can be especially useful for virtual network appliances, virtual gateways, file servers, and similar network-intensive applications, because you’ll now be able to virtualize them without any network throughput degradation. A nice thing about vRSS is that it will work on existing network hardware that is VMQ-capable. This means you don’t have to upgrade your hardware in order to take advantage of this new capability. RSS (and vRSS) is disabled by default in Windows Server 2012 and should only be enabled on network-intensive virtual machines. This is because extra processing is required for vRSS to spread the incoming network traffic inside the host. In other words, enabling vRSS trades CPU cycles for network throughput. You can configure and manage vRSS by using Windows PowerShell commands and scripts. Figure 5-2 shows how to use the Get-NetAdapterRss cmdlet to get all RSS-capable network adapters on a system that have RSS enabled and display their names, interface description, and state. The figure also shows how to use the Get-Command cmdlet to display a list of all cmdlets available for managing RSS and vRSS.
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90 CHAPTER 5 Networking FIGURE 5-2 You can use Windows PowerShell to manage vRSS. Windows NIC Teaming enhancements Windows servers today are often huge beasts with tons of processing power to handle the biggest business workloads. Getting data in and out of such servers requires fat pipes—lots of network bandwidth—and for some environments even a single 10 GbE Ethernet network interface card (NIC) is insufficient and becomes a bottleneck. And what if that NIC fails for some reason? Your enterprise-class server suddenly becomes an expensive paperweight! NIC teaming can address such problems. Also known as Load Balancing/Failover (LBFO), NIC teaming refers to any technological approach that enables two or more NICs to be linked together to form a team of some kind. Until recently, if you wanted to use NIC teaming, you had to implement a proprietary solution provided by your NIC hardware vendor. But beginning with Windows Server 2012, you now have an in-box solution called Windows NIC Teaming that you can use for implementing NIC teaming on your Windows servers. NIC teaming can provide two types of benefits for enterprise networks. First, it allows you to aggregate the throughput from multiple network adapters. For example, let’s say you have a server system that has two 1 gigabit network adapters configured as a team. The result
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