Hi!
One more thing to note: to get proper results with the write tests you should write a file at least 2xYour_RAM_size. At least this is what bonnie or iozone does. Otherwise you'll get incorrect results, as probably the ones posted above. In your case it's a little bit harder to do if you have 64 Gigs of ram. I have only 7.
And if you are testing this on Thin_provisioned/lazy_zeroed disks on ESXi, then the result will vary greatly for the first time and second time writing the same block. As you can't easy tell when it's writing the block for the first or for the second time it's hard to get the correct results on Thin provisioned disks.
Code:root@mail:/opt/test# time sh -c "dd if=/dev/zero of=/opt/test/ddfile1 bs=8k count=17500 && sync"
17500+0 records in
17500+0 records out
143360000 bytes (143 MB) copied, 0.175012 s, 819 MB/s
real 0m1.903s
user 0m0.000s
sys 0m0.244s
root@mail:/opt/test# time sh -c "dd if=/dev/zero of=/opt/test/ddfile2 bs=8k count=175000 && sync"
175000+0 records in
175000+0 records out
1433600000 bytes (1.4 GB) copied, 2.50452 s, 572 MB/s
real 0m34.472s
user 0m0.084s
sys 0m2.540s
root@mail:/opt/test# time sh -c "dd if=/dev/zero of=/opt/test/ddfile3 bs=8k count=1750000 && sync"
1750000+0 records in
1750000+0 records out
14336000000 bytes (14 GB) copied, 146.679 s, 97.7 MB/s
real 2m28.665s
user 0m0.580s
sys 0m42.463s
