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Introduction
NVM Express® (NVMe™) is an optimized, high-performance scalable host controller interface designed
to address the needs of Enterprise and Client systems that utilize PCI Express®-based solid-state storage.
Designed to move beyond the dark ages of hard disk drive technology, NVMe is built from the ground up
for non-volatile memory (NVM) technologies. NVMe is designed to provide efficient access to storage
devices built with non-volatile memory, from today’s NAND flash technology to future, higher-
performing, persistent memory technologies.
There are several performance vectors that NVMe addresses, including bandwidth, IOPs, and latency.
For example, the maximum IOPs possible for Serial ATA was 200,000, whereas NVMe devices have
already been demonstrated to exceed 1,000,000 IOPs. By supporting PCI Express and Fabrics such as
RDMA and Fibre Channel, NVM Express can support much higher bandwidths than SATA or SAS (e.g., a
PCI Express Gen3 x4 delivers 4 GB/s). Finally, next generation memory technologies may have read
access latency under a microsecond, requiring a streamlined protocol that enables an end-to-end
latency of under 10 microseconds, including the software stack.
NVMe is a completely new architecture for storage, from the software stack to the hardware devices
and systems.
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