NEC's New I/O Virtualization Technology Enables Simultaneous Sharing of I/O Devices among Multiple Computers

Tokyo, - NEC Corporation (NEC; TSE: 6701) announced today the development of a new I/O virtualization technology that enables simultaneous sharing of I/O devices among multiple computers.

This technology is a major extension of the ExpEther (*1) that virtualizes PCI Express switches over standard Ethernet.

The technology provides scale-up capability to data center servers by flexibly reconfiguring I/O devices along with service requirements. Furthermore, the flexibility of using virtual devices only when necessary, as compared to installing multiple devices on each individual server, reduces capital expenditure by an estimated 50% and power consumption by approximately 30%.

Conventionally, PCI Express required such components as Root Complex, PCIe switches, endpoint devices and PCIM (PCI Manager) in order to comply with MR-IOV standards (*2) and to share I/O devices between multiple computers.

This newly developed technology uses I/O devices that comply with the SR-IOV standard (*3) which provides sharing an I/O device from a multiple Virtual Machine (VM) on a single computer. Compared to MR-IOV, SR-IOV is easy to implement and then, some venders already released SR-IOV compliant I/O devices today. ExpEther's connection with this single SR-IOV compliant device enables it to share I/O devices through multiple computers using Ethernet. As a result, the new technology provides users with a solution that is similar to MR-IOV, but earlier and cheaper adaptation.

NEC verified the performance of this technology on real computer platforms using Exar Corporation's SR-IOV compliant 10G-Ethernet card, the X-3100, and connections to ExpEther. (*4)

NEC is currently driving the research and development of computing platforms and next generation ICT platforms. Moreover, NEC is seeking to provide new computing possibilities and user benefits through the growth and standardization of these technologies.

NEC has demonstrated a prototype of the storage gateway box featuring ExpEther at Interop 2010, held from June 9 - 11 in Makuhari Messe, Chiba. NEC also plans to release new products that have adopted this technology in 2011.

This work was partly supported by Ministry of Internal Affair and Communications (MIC).
(*1) ExpEther
ExpEther is a virtualization technology for servers and network equipment that was first launched in 2006. The system integrates two major standard computer and network interfaces, the PCI Express ("PCIe") and Ethernet. Further information is available at
(*2) MR-IOV
MR IOV is the specification for I/O virtualization that enables I/O to be shared among multiple computers. Further information is available at,
SR-IOV is the specification for I/O virtualization that enables I/O to be shared among multiple virtual machines in a single computer. Further information is available at
No modifications were made to any components, including the OS and drivers.

About NEC Corporation

NEC Corporation is a leader in the integration of IT and network technologies that benefit businesses and people around the world. By providing a combination of products and solutions that cross utilize the company's experience and global resources, NEC's advanced technologies meet the complex and ever-changing needs of its customers. NEC brings more than 100 years of expertise in technological innovation to empower people, businesses and society. For more information, visit NEC at
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NEC Press Contact:
Chris Shimizu
NEC Corporation

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