File System Traces

[Eric Sandeen]

ViVu wrote:
> Hello All,
> 
> I'm trying to collect the following information about an application at the
> file system layer:
> 
> Type of request - Read/Write
> Sector Number to which the request is directed - to which the request is
> directed
> Time of request
> 
> Can anyone pls let me know what changes should I make in which modules to
> extract this information? Thanks a lot!!

I'd probably use Jens Axboe's blktrace, google can find it for you (or,
fedora has rpms, other distros probably do to)

the vm.block_dump sysctl might also help.

-Eric