nginx high i/o

[Stefanita Rares Dumitrescu]

hi guys,

i have posted a question a while ago, and now i am coming back once more.

i have now a dual quad core xeon system, running freebsd 7.2 latest 
patch level, 64 bit, and 16 gb ram. using the latest nginx-devel.

the OS runs on a ssd, the db is set on a normal drive, and the site 
files reside on another ssd.

i had a pretty similar config just instead i was using centos.

the i/o on the main drive (os drive) is constantly at 22 mb/s.

i have disabled nginx logging, and everything has been setup from the 
ground. i have no idea why do i get such high i/o, because i have no 
other apps that could cause this load.

could you please point me to some direction ? i don't know what to do.

              ad4              ad5              ad6
   KB/t tps  MB/s   KB/t tps  MB/s   KB/t tps  MB/s
  54.56 428 22.79   0.00   0  0.00  32.89   4  0.14
  55.05 492 26.46   0.00   0  0.00  26.38   8  0.21
  55.24 452 24.40   0.00   0  0.00  36.36   5  0.20
  53.20 457 23.76  22.31  19  0.42  19.88   8  0.16
  53.33 464 24.15   0.00   0  0.00  48.47  23  1.11
  54.14 403 21.32   0.00   0  0.00  16.18 217  3.43
  52.75 406 20.90   0.00   0  0.00  17.49 178  3.04
  55.75 402 21.90   0.00   0  0.00  13.42  12  0.16