Test your total disk IO capacity, regardless of caching, to find out how fast the TRUE speed of your disks are

time (dd if=/dev/zero of=blah.out bs=256M count=1 ; sync )
Depending on the speed of you system, amount of RAM, and amount of free disk space, you can find out practically how fast your disks really are. When it completes, take the number of MB copied, and divide by the line showing the "real" number of seconds. In the sample output, the cached value shows a write speed of 178MB/s, which is unrealistic, while the calculated value using the output and the number of seconds shows it to be more like 35MB/s, which is feasible.
Sample Output
1+0 records in
1+0 records out
268435456 bytes (268 MB) copied, 1.50648 seconds, 178 MB/s

real    0m7.119s
user    0m0.002s
sys     0m0.649s

2
By: tkunz
2009-07-14 20:19:23

1 Alternatives + Submit Alt

What Others Think

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ioggstream · 699 weeks and 2 days ago
What you're doing here is really testing *filesystem* performance rather than disk IO. For actual "disk IO", do what ioggstream said or use hdparm: hdparm -t /dev/sda this will test drive throughput by actually streaming a write off the disk. Use the -T option to test how fast the cpu, memory, & linux disk buffer cache can theoretically go. The underlying filesystem can
bwoodacre · 699 weeks and 1 day ago
you need to also sync before time command to make sure that the previous file system writes are synched before you start the test: sync; time { dd if=/dev/zero of=test bs=256m count=1; sync; }
bluejay · 359 weeks and 1 day ago
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Perfecthomepugs · 5 weeks and 2 days ago

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