Chapter 14. Remote Replication
Remote replication is the process of creating replicas of information assets at remote sites (locations). Remote replicas help organizations mitigate the risks associated with regionally driven outages resulting from natural or human-made disasters. Similar to local replicas, they can also be used for other business operations.
The infrastructure on which information assets are stored at the primary site is called the source. The infrastructure on which the replica is stored at the remote site is referred to as the target. Hosts that access the source or target are referred to as source hosts or target hosts, respectively. This chapter discusses various remote replication technologies, along with the key steps to plan and design appropriate remote replication solutions. In addition, this chapter describes network requirements and management considerations in the remote replication process.
Modes of Remote Replication
The two basic modes of remote replication are synchronous and asynchronous. In synchronous remote replication, writes must be committed to the source and the target, prior to acknowledging "write complete" to the host (see Figure 14-1). Additional writes on the source cannot occur until each preceding write has been completed and acknowledged. This ensures that data is identical on ...
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