File Upload and copying that file to several servers

Hi,

I ve got a little rails application to configure another web
application. I would like to allow editors to upload graphic files,
which will be shown by that web application as a teaser.

My issue is that I have to copy these graphic files to several web
servers and I have to guarantee that all servers successfully received
these files before I "enable" these new graphics.

Do you have any recommendations? Maybe there is already a plugin?

Thanks a lot in advance..
Volker