I am a little confused about NAS volume replication.

We have 2 Open-E 16TB servers both with 12x 750Gb disks.

What i want is that every volume, in our case all NAS volumes, is realtime replicated to the 2nd server.

I have seen volume replication in volume manager and replication in Maintenance -> backup.

Can anybody explain to me what i have to do to mirror server1 to server2 realtime?

Thanks.