abshard

I have 4 cheap identical servers at ovh, all 4 currently have same data on them and i'm using round robin dns to serve mp4s. Each one is capped at 500mbs and I'm using average of 400mbs on each. My problem is I'm running out of hard drive space.

What would be the best solution?

Turn the 4 mirrored servers into 2 sets mirrored servers each set with half the data? Then change half of the video urls in my script to the new url for the new server set. The reason I would split the videos now is because of bandwidth limits on each server.

Or is there something else I can do with nfs shares and not have to change any urls in my tube script? Keep half the videos on each set of 2 servers but link them with nfs shares and not have to change any urls. And I need to utilize the 500mbs bandwidth on each server.

Which would be a better solution or is there something else I can do?