One of the benefits of virtualization is that it enables administrators to efficiently share host resources among different applications. In fact, administrators often oversubscribe the physical resources on a host in order to maximize the number of workloads that can run on a host. But how much oversubscription is too much? This paper by Virtualization Evangelist, Scott D. Lowe, discusses what oversubscription is and why it is used, explores the pros and cons of the practice, and proposes some ideas about the point at which oversubscription becomes dangerous.
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