i made another test with a non production vitual machine
testfile 40GB

C:\Program Files (x86)\SQLIO>sqlio.exe -kW -s20 -frandom -o64 -b4 -LS -Fparam.tx
t
sqlio v1.5.SG
using system counter for latency timings, 3579545 counts per second
parameter file used: param.txt
file g:\testfile.dat with 1 thread (0) using mask 0x0 (0)
1 thread writing for 20 secs to file g:\testfile.dat
using 4KB random IOs
enabling multiple I/Os per thread with 64 outstanding
size of file g:\testfile.dat needs to be: 41943040000 bytes
current file size: 10485760 bytes
need to expand by: 41932554240 bytes
expanding g:\testfile.dat ... done.
using specified size: 40000 MB for file: g:\testfile.dat
initialization done
CUMULATIVE DATA:
throughput metrics:
IOs/sec: 33119.70
MBs/sec: 129.37
latency metrics:
Min_Latency(ms): 0
Avg_Latency(ms): 1
Max_Latency(ms): 403
histogram:
ms: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24+
%: 84 15 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1

so i hope this help

i think the test above was made on the wrong machine.
our exchange has a 300GB database...