Testing the disk speed on a linux machine is quite simple. Just use the
To use the dd command to measure disk speed, you’ll need the following flags:
if: input file. In this case the disk you’re testing (eg. /dev/zero)
of: outputfile. A file to read the output of the test. Can be any format for textfiles.
bs: sets the if and of sizes to bytes
count: number of blocks (1 ➡ 1 block of 1G is copied)
oflag: we’re gonna use it to avoid the buffer cache. It makes stuff faster.
Now just combine these tasty
ingredients flags into one command:
$ dd if=/dev/zero of=/root/testfile bs=1G count=1 oflag=direct
You’ll get a bunch of lines, after you execute this command. The most important is a line that looks like
32.474 s, 32.1 MB/s.
It means the actual disk speed was 32.1 MB/s.