The new NVM Express 2.0 has been released and with it a surprise: The non-volatile memory express protocol—best known for handling SSD speeds—is now offering full-blown support for traditional hard-disk drives.
This is quite unexpected because SSDs are orders of magnitude faster than traditional HDDs.
[ Read also: How to plan a software-defined data-center network ]
The first flash-based SSDs used SATA/SAS physical interfaces borrowed from existing hard drive-based enterprise server/ storage systems. However, none of these interfaces and protocols were designed for high-speed storage media and the SATA/SAS bus became a bottleneck for the much faster SSD.
Source:: Network World – Data Center