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11. Clustering and High Availability

Chapter 11. Clustering and High Availability

High availability is about ensuring that important services and applications remain available to clients on the network if a server suffers a catastrophic failure. You can take several different approaches to implementing high availability. The one that you choose depends on the resources you have available at your disposal. The cheapest way of ensuring high availability is using DNS Round Robin. DNS Round Robin has the advantage of being a cross-platform solution, but it has the disadvantage of not being aware when one of the DNS Round Robin target servers fails. Network Load Balancing (NLB) allows you to balance traffic across multiple servers and is failure-aware, but it doesn’t work well directly with server applications, such as file servers. Failover clustering ensures that you still will have access to the network service or application in the event of catastrophic server failure, but it has the disadvantage of requiring access to a storage area network (SAN). In this chapter, you will learn about each of these high-availability solutions and how you can decide which one of them is appropriate to deploy to support your organization’s specific needs.


  

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