How does storage function differently with Red Hat than it does with VMware or Hyper-V?
Van Vugt: One thing that is quite unique with RHEV is that Red Hat storage is added. Now let me explain exactly what Red Hat storage is doing. In normal virtualization solutions, storage is mostly on the SAN, which means that there is a centralized device, and on the centralized device, you will create a disk, and you will share that between different hypervisors. So every hypervisor basically is writing to the same disks on the same SAN. It doesn't really matter if your SAN is redundant because even if it is redundant, it's still the same disk.
Now with Red Hat storage added, storage can be allocated on different machines, and Red Hat storage decides exactly where the data is stored. This is a very clever way of creating a distributed file system, which makes sure that virtual machines are stored in the data center where they really are needed. So to summarize, the difference of how storage is handled in Red Hat as compared to VMware, for example, is the decentralized storage approach.