Mastering VMware vSphere 5.5 by Scott Lowe & Nick Marshall & Forbes Guthrie & Matt Liebowitz & Josh Atwell

Author:Scott Lowe & Nick Marshall & Forbes Guthrie & Matt Liebowitz & Josh Atwell
Language: eng
Format: epub
Publisher: John Wiley & Sons
Published: 2013-03-30T04:00:00+00:00

After reviewing the diagram of a cluster-in-a-box configuration, you might wonder why you would want to deploy such a thing. The truth is, you would want to deploy a cluster-in-a-box configuration only in certain circumstances because it still maintains a single point of failure. With both VMs running on the same host, if that host fails, both VMs fail. This architecture contradicts the very reason for creating failover clusters. A cluster-in-a-box configuration still contains a single point of failure that can result in downtime of the clustered application. If the ESXi host hosting the two-node cluster-in-a-box configuration fails, then both nodes are lost, and a failover does not occur. It's a relatively simple setup to configure and probably best suited for learning or testing the cluster service configurations. You may also find yourself in a situation where it's needed for planned downtime or patching.

Configuration Options for Virtual Clustering

As suggested in the first part of this chapter, server clusters are deployed for high availability. In a vSphere-based outage, high availability is not achieved by using a cluster-in-a-box configuration, and therefore you should avoid this configuration for any type of critical production applications and services.

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