Roland Illig wrote:
> Hi,
> 
> I have written a little archiver program, since both pax and tar cannot 
> create files larger than 4 GB. :(

This part of the problem is solved. Now back to the main problem, which 
should be at least as interesting as bashing filesystems:

> Since I expect the program to not read any data twice, I added the 
> O_DIRECT flag to all open(2) calls. But top(1) still tells me that most 
> of my RAM is occupied by "FILE", and only about 1 megabyte is "Free".
> 
> All the involved filesystems are ffs. So did I understand O_DIRECT 
> wrong? Or is it at all impossible to disable the kernel cache for file 
> data?

Roland