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Storage Design and Implementation in vSphere 6: A Technology Deep Dive, Second Edition by Mostafa Khalil

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Chapter 15. Snapshot Handling

Data is written to storage devices frequently in the dynamic environment of vSphere 6. Losing a few hours’ worth of data, for whatever reason, could mean a large amount of data loss. Storage arrays provide various forms of business continuity/disaster recovery (BC/DR) capability to help mitigate this risk, including the following:

• Snapshots

• Replicas

• Mirrors

In this chapter, I cover details of these features in relationship to Virtual Machine File System (VMFS) datastores.

What Is a Snapshot?

A storage snapshot is a static view of data at a certain point in time. Snapshots are commonly implemented as pointers to unmodified blocks on the primary logical unit number (LUN) at the time the snapshot is taken. If ...

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