SSD performance 2015

There is significant benefit to be found using SSD’s these days. The benefits come largely from concurrency, as well as faster PCIe access. There are some numbers below that show the difference in read and write performance over sequential and random workloads.

SATA is limited to 750MB/s. PCI3 goes up to 40GB/s which is pretty much the bandwidth of the memory bus. SSD’s typically demonstrate latencies around 60 times faster than spinning drives.

Below are a three typical commodity drives as of April 2015. The SSD quoted uses a PCIe mount which makes the comparison pretty unfair, so just take that into account. Like all media they still operate better for sequential workloads where prefetching aids throughput. So whilst SSD’s undoubtably change these problems note the price performance. The Seagate HDD holds 8TBs. The SSD only 0.5TB.

Samsung XP941 SSD (£300 0.5TB) – A fast PCIe mounted SSD drive

Seagate Archive 8TB HDD (£242) – A high storage mechanical drive

Western Digital Raptor 1TB HDD (£178) – a low storage, fast mechanical drive

Sequential Read

  • Sam HDD ~ 190MB/s
  • Rap HDD ~ 203MB/s
  • XP941 SSD ~ 1,485 MB/s

Sequential Write

  • Sam HDD ~ 190MB/s
  • Rap HDD ~ 203MB/s
  • XP941 SSD ~ 710 MB/s

Random Read

  • Sam HDD ~ 300 reads/sec
  • Rap HDD – 270 reads/sec
  • XP941 SSD ~ 80,000 reads/sec

Random write

  • Sam HDD ~ 402 reads/sec
  • Rap HDD ~ 366 reads/sec
  • XP941 SSD ~ 50,000 reads/sec

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