3 ms·

In practice, it's actually fine for most purposes. It's equivalent to multiple striped 15K RPM magnetic disks, which used to be high-end enterprise storage a fe

• Dylan16807 10y ago
  > In practice, it's actually fine for most purposes. It is, yes, but I wouldn't refer to it as comparable to an SSD. > SD cards have much worse write IOPS. Surprisingly not! Testing in ATTO I got read and write speeds that were almost identical, and a peak of 2000 IOps.
  • phonon 10y ago
    >It is, yes, but I wouldn't refer to it as comparable to an SSD. EBS (gp2) is flash based, has far better performance than high end magnetic disks, with excellent latency and consistent performance. So, it's more comparable to SSD than anything else. >Surprisingly not! Testing in ATTO I got read and write speeds that were almost identical, and a peak of 2000 IOps. Really? Were you looking at 4K write? Typically that would be under 1 MB/s for an SD card.
    • Dylan16807 10y ago
      https://www.amazon.com/gp/product/B013CP3MMM https://www.amazon.com/gp/product/B013CP3MMM http://i.imgur.com/PRoxVPM.png http://i.imgur.com/PRoxVPM.png It's a relatively high-quality SD card, unfortunately hampered by my reader's inability to use bus speed over 25MB/s.
      • phonon 10y ago
        Nice card! So about 1500 write IOPS at 4K. Performance might be worse (or better) at other queue depths though.