IOSpeedTest

# IO speed tests on a new softlayer server using the cheap 500gb Sata drives.

#62500 blocks per gig
# want to double ram
# have 12gb, so want 24gb worth
# 62500 * 24 = 1500000

root@koz-two:~# time sh -c "dd if=/dev/zero of=ddfile bs=16k count=1500000 && sync"
1500000+0 records in
1500000+0 records out
24576000000 bytes (25 GB) copied, 310.911 s, 79.0 MB/s

real	5m15.546s
user	0m0.340s
sys	0m49.931s


#run this to flush the previous file out of memory
root@koz-two:~# dd if=/dev/zero of=ddfile2 bs=16K count=750000 
750000+0 records in
750000+0 records out
12288000000 bytes (12 GB) copied, 149.935 s, 82.0 MB/s

#run this to read original file
root@koz-two:~# time dd if=ddfile of=/dev/null bs=16k 
1500000+0 records in
1500000+0 records out
24576000000 bytes (25 GB) copied, 120.413 s, 204 MB/s

real	2m0.508s
user	0m0.248s
sys	0m13.237s