Behold, the spectrum of storage

Subject: General Tech | April 5, 2016 - 12:47 PM |
Tagged: NVMe, SAS, sata, PCIe SSD, low latency

The Register have put together a nice graphic and table displaying current storage technologies and how they relate to each other.  They constructed the graph to demonstrate the major boundaries in storage, between cache/memory, local storage and external storage and how these are going to move thanks to new technology.  NVMe-over-fabric will enable companies to utilize external storage at latencies lower than internal storage that still uses SATA or SAS, with only pure PCIe local storage outpacing its potential.  X-Point, assuming it lives up to the hype, will blur the line between local storage and memory/cache storage, offering latency previously only seen in system memory or on-die cache.

They also provide a table to give you some rough ideas how this translates between storage media, normalizing it a theoretical task which would take L1 cache 1 second to access, this can make it somewhat easier to comprehend for some than nanoseconds.

memory_storage_latency_spectrum.jpg

"Two technology changes are starting to be applied and both could have massive latency reduction effects at the two main storage boundary points: between memory and storage on the one hand, and between internal and external, networked storage on the other."

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Source: The Register