How to calculate I/O bandwidth?

We have couple of Sun F 4800 servers which are not performing as expected. How to calulate how much I/O bandwidth we are getting?
Thanks in advance.

On a 1 CPU 1 GHz box. 2 GB memory.
Note: More CPUs does not make this test faster. You can run one per CPU and time how long it take to run them all. This is only valid if you have much more memory than the data you are moving around. :)
The second test is a read and a write. so about 275 MB/s
$ time mkfile 300m deleteme
real    0m1.159s
user    0m0.020s
sys     0m1.130s
$ time dd if=deleteme of=deleteme2 bs=64k
4800+0 records in
4800+0 records out
real    0m2.188s
user    0m0.030s
sys     0m2.160s

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