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The Virtualization Cookbook for IBM z Systems Volume 1: IBM z/VM 6.3 by Ken Werner, Paul W Novak, Felipe Miranda, Berthold Gunreben, Lydia Parziale

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Servicing z/VM
You cannot solve a problem with the same kind of thinking that created it.
— Albert Einstein
This chapter focuses on the requirements to keep your z/VM systems updated to ensure full functionality, optimal utility, security, and the elimination of known problems. The process of ordering and applying z/VM Service is described.
The full details are provided to apply the two main types of service:
Recommended service upgrade (RSU), which is analogous to a service pack
Program temporary fix (PTF), which is analogous to a bug fix ...

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