Virtualization and blade server technologies have enabled a generation of consolidated computing devices capable...
By submitting your email address, you agree to receive emails regarding relevant topic offers from TechTarget and its partners. You can withdraw your consent at any time. Contact TechTarget at 275 Grove Street, Newton, MA.
of cramming extraordinary computing power into smaller form factors. But the increased processing power per square inch has brought about a new I/O problem: The pipes can't move data fast enough to keep up with today's processors. To address that problem, new I/O virtualization products and standards are emerging to extend PCI Express (PCIe) pathways to separate I/O devices. This allows multiple physical servers and virtual machines (VMs) to share I/O resources.
Industry standard bodies are getting involved as well. The PCI Special Interest Group (PCI-SIG), which handles PCI specifications, has developed and formalized two standards specific to IO virtualization: Single-Root IOV (SR-IOV) and Multi-Root IOV (MR-IOV).
According to the PCI-SIG, SR-IOV allows multiple guest operating systems to simultaneously access an I/O device without requiring a hypervisor on the main data path. MR-IOV builds upon the SR-IOV standard by allowing access to PCI- or SR-IOV-compliant I/O devices over a shared PCIe fabric. The goal of the standards is to enable multiple separate servers to access and share multiple I/O cards inside one or more card cages. Both SR-IOV and MR-IOV meet that goal, but neither standard has seen any significant vendor adoption.
While vendors seem to be eschewing industry standards, that hasn't stopped their progress in the market; they're pushing proprietary solutions and are starting to find market traction and early adopter customers.