-1

Is it normal to have less than 15 megabytes per second writes on a solid state drive (Evo 850 250GB to be exact)?

$ date;dd if=/dev/random of=/var/tmp/test bs=4096 count=81920;date
Tue Nov 22 16:59:00 +03 2016
81920+0 records in
81920+0 records out
335544320 bytes transferred in 23.296377 secs (14403283 bytes/sec)
Tue Nov 22 16:59:24 +03 2016

This is the order of magnitude less than than the theoretical ceiling of 150 MB/s for SATA 1.0 that Apple chose to keep forcing down the Mac mini user throats. And no, this is not a Mac mini but the very latest iMac 5K.

2

Nevermind, /dev/random turned out to be expensive:

$ date;dd if=/dev/zero of=/var/tmp/test bs=4096 count=81920;date
Tue Nov 22 17:05:55 +03 2016
81920+0 records in
81920+0 records out
335544320 bytes transferred in 0.719295 secs (466490534 bytes/sec)
Tue Nov 22 17:05:56 +03 2016
|improve this answer|||||
  • Neither question nor answer show much research how proper (SSD|HDD) benchmarking works (sequential r/w, 4k r/w etc) – klanomath Nov 22 '16 at 14:18
  • 1
    Right, I needed a rough estimate. And I think I got the jist of it. – Anton Tropashko Nov 23 '16 at 7:55

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .