I know from searching this is something that's been asked a few times, but i'm a newbie to linux and need a solution for my problem.

What i got is two machine with CentOS4.4 as a host OS then i run two Virtual Machines (using VMware Server) on each.

What i now what to do is replicate these VM's onto a 3rd machine for Disater Recovery. So i need a product that will replicate the Folder /usr/lib/Virtual Machines/*.* on both machines onto the 3rd server in the same location.

We are talking atm each VM being around the 20GB mark.

rsync is designed for replicating entire directory structures. It has the beauty of allow you to update later so that it only transfers the changes rather than the whole thing over again.

Whether or not replicating a VM directory structure will have the effect you want is another question that I can't answer but the above tool will let you do the replication.

If you have ssh running on either host then you can use scp to just copy the vm files across. If you will want to do this on a regular basis you can use cron (crontab) to schedule the execution of the scp command.

scp is a good thing for copying and what I use for quick copying from host to host. However for any sort of recurring process I'd use rsync because of the control it allows and the fact that it only transfers things that have changed thereby saving bandwidth. It has other flags such as one that will let you even tell it to delete things on the target if they don't exist on the source so you can be sure both directories are exactly the same.

For that kind of data size, rsync over ssh is definitely a must.