On OSX:
time dd if=/dev/zero bs=2048k of=tstfile count=8192 2>&1 | awk '/sec/ {print $1 / $5 / 1048576, "MB/sec" }'
On Debian:
time dd if=/dev/zero bs=2048k of=tstfile count=8192 2>&1 | awk '/ s/ {print $1 / $6 / 1048576, "MB/sec" }'
Results in like this for 2x1 TB WD disks in Raid1
159,068 MB/sec
real 1m43.164s
user 0m0.017s
sys 0m7.197s
or for Samsung SSD (EVO 250):
297,891 MB/sec
real 0m55.622s
user 0m0.019s
sys 0m5.838s
with the file written before:
time dd if=tstfile bs=2048k of=/dev/null count=8192 2>&1 | awk '/sec/ {print $1 / $5 / 1048576, "MB/sec" }'
result of 2x1 TB WD disks in Raid1:
159,068 MB/sec
real 1m43.045s
user 0m0.017s
sys 0m4.505s
or for Samsung SSD (EVO 250):
528,516 MB/sec
real 0m31.282s
user 0m0.016s
sys 0m4.861s
rm tstfile
source: http://hints.macworld.com/article.php?story=20120704113548693