>I don't have iostat on that machine, but vmstat shows a lot of writes to
>the drives, and the runnable processes are more than 1:
>
> 6 1 0 3617652 292936 2791928 0 0 0 52430 1347 4681 25
>19 20 37
>
>
Assuming that's the output of 'vmstat 1' and not some other delay,
50MB/second of sustained writes is usually considered 'a lot'.