4 ms·

Others have mentioned the SSD and VFS cache, however spinning disks in a RAID configuration can easily surpass this in raw sequential read performance.

• BeeOnRope 8y ago
  Not really "easily" - the second test does 1.5 GB in 0.622s for a throughput of 2.41 GB/s. If we assume something like 100 MB/s sustained for spinning disks, that's a lot of disks to get to 2.41 GB/s even ignoring overheads.
  • Rapzid 8y ago
    100 MB/s sustained is very slow these days. Even a Barracuda budget 7200 will hit >150 MB/s real world and it goes up from there.
    • BeeOnRope 8y ago
      Even at 200 MB/s that is at least a dozen disks in zero redundancy RAID to get the needed speed. This test was hitting the OS disk cache.