NVMe over Fabrics Support Coming to the Linux 4.8 Kernel
The Flash Memory Summit recently wrapped up its conferences in Santa Clara, California, and only one type of Flash technology stole the show: NVMe over Fabrics (NVMeF). From the many presentations and company announcements, it was obvious NVMeF was the topic that most interested the attendees.
With the first industry specifications announced in 2011, Non-Volatile Memory Express (NVMe) quickly rose to the forefront of Solid State Drive (SSD) technologies. Historically, SSDs were built on top of Serial ATA (SATA), Serial Attached SCSI (SAS) and Fibre Channel buses. These interfaces worked well for the maturing Flash memory technology, but with all the protocol overhead and bus speed limitations, it did not take long for these drives to experience performance bottlenecks. Today, modern SAS drives operate at 12 Gbit/s, while modern SATA drives operate at 6 Gbit/s. This is why the technology shifted its focus to PCI Express (PCIe). With the bus closer to the CPU and PCIe capable of performing at increasingly stellar speeds, SSDs seemed to fit right in. Using PCIe 3.0, modern drives can achieve speeds as high as 40 Gbit/s. Leveraging the benefits of PCIe, it was then that the NVMe was conceived. Support for NVMe drives was integrated into the Linux 3.3 mainline kernel (2012).
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