3 ms·
You seemed to miss random access I/O speed (4K reads/writes), which usually matters quite a bit more than sequential access. Random reads almost doubled even w
by vardump 6y ago
You seemed to miss random access I/O speed (4K reads/writes), which usually matters quite a bit more than sequential access.
Random reads almost doubled even with a cheap SSD and random reads nearly tripled.
- megous 6y agoThere's no test methodology, so it doesn't matter. Is it measuring raw block device I/O or filesystem I/O, which filesystem, is it submitting I/O requests sequentially or in batches so that the OS can queue multiple requests at once, etc. etc. There's nothing to compare against, so I didn't even try running the test. USB 3.0 has no trouble with high random I/O either, anyway. Article is comparing different SSDs, not just different interfaces, so random 4k block read speeds differ. But it doesn't show what's possible with good USB 3.0 SATA controller and good SSD. I just wanted to point out that speed difference doesn't have to have much to do with the interfaces themselves.