[CentOS] Finding i/o bottleneck

>> I did used these utilities, while it can help see what processes are
>> generating IO, it doesn't show what files on the file system are being 
>> asked
>> or waited for.
>>
>> Basicly, what I'm searching is an equivalent for fs_usage on Mac OS X, or
>> tcpdump, but on a bloc device...
>
> Not sure what those do, but lsof should show what files are open, and
> 'strace -p process_id' would show the system calls issued by a
> process.

Thanks, that might be usefull. I'ill just have to find a way to strace 
multiple process at once and find the usefull info among that load of 
data...

Nicolas