Low cpu, low ram, but high load

15:59:52 up 6 days, 57 min, 1 user, load average: 9.48, 13.65, 20.16
254 processes: 252 sleeping, 2 running, 0 zombie, 0 stopped
CPU0 states: 3.3% user 10.3% system 0.0% nice 0.0% iowait 85.2% idle
CPU1 states: 2.2% user 12.3% system 0.0% nice 0.0% iowait 84.3% idle
Mem: 2064400k av, 1793256k used, 271144k free, 0k shrd, 11916k buff
1326324k actv, 81564k in_d, 176336k in_c
Swap: 1052216k av, 79896k used, 972320k free 1164300k cached

I can't see why the load is so high. Ram and cpu is doing fine, and there is no iowait. Is there anyway to detect where the load? This is a file download server.

 

 

 

 

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