Learning about replicated local storage
Possibly the most critical storage type, and the least understood, is replicated local storage or RLS. RLS is not a difficult concept, it is quite simple. But there are many myths surrounding other concepts, such as SAN, that they have clouded the functionality of RLS. For example, many people have started using the term shared storage as a proxy for external storage or possible for SAN. But external storage does not mean that it is or can be shared, and local storage does not mean that it is not or cannot be shared.
The term replicated local storage refers to two or more computer systems which have local storage that is replicated between them. From the perspective of each computer system, the storage is locally attached, just like normal. But there is a process that replicates the data from one system to another, so that changes made on one appear on the other.
Replicated local storage can be achieved in multiple ways. The simplest,...