Red Hat APPLICATION STACK 2.0 RELEASE Manual de usuario descargar pdf (Pagina 11)

Mellanox Reference Architecture for Red Hat Enterprise Linux OpenStack Platform 4.0

Rev 1.1

Mellanox Technologies

3 Network Virtualization on ConnectX-3 Adapters

Single Root IO Virtualization (SR-IOV) allows a physical PCIe device to present itself as

multiple devices on the PCIe bus. This technology enables a single adapter to provide multiple

virtual instances of the device with separate resources. Mellanox ConnectX®-3 adapters are

capable of exposing 127 virtual instances called Virtual Functions (VFs). These virtual

functions can then be provisioned separately. Each VF can be viewed as an additional device

associated with the Physical Function. It shares the same resources with the Physical Function,

and its number of ports equals those of the Physical Function.

SR-IOV is commonly used in conjunction with an SR-IOV enabled hypervisor to provide

virtual machines with direct hardware access to network resources, thereby improving

performance.

Mellanox ConnectX-3 adapters equipped with onboard embedded switch (eSwitch) are

capable of performing layer-2 switching for the different VMs running on the server. Using

the eSwitch will gain higher performance levels in addition to security and QoS.

Figure 4: eSwitch Architecture

eSwitch main capabilities and characteristics:

 Virtual switching: creating multiple logical virtualized networks. The eSwitch offload

engines handle all networking operations up to the VM, thereby dramatically reducing

software overheads and costs.

 Performance: The switching is handled in hardware, as opposed to other applications that

use a software-based switch. This enhances performance by reducing CPU overhead.

 Security: The eSwitch enables network isolation (using VLANs) and anti-MAC spoofing.

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Red Hat APPLICATION STACK 2.0 RELEASE Manual de usuario Pagina 11