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Storage Implementation in vSphere® 5.0 by Mostafa Khalil

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Chapter 10. Using VMDirectPath I/O

One of the least-known features introduced in vSphere 4.x that continues to be in vSphere 5 is VMDirectPath I/O. In this chapter, I explain what it is, how it works, and some practical design implementations.

What Is VMDirectPath?

Have you ever wanted to access a certain storage device directly from within a Virtual Machine (VM) but the devices is not Raw Device Mapping (RDM) capable?

Do you have a fibre-attached tape library that you want to use within a VM and provide multipathing to it?

Do you have an application that requires a specific Peripheral Component Interconnect (PCI) device accessed directly from within the VM?

The answer to these questions is a definite yes! (With caveats.)

VMDirectPath on vSphere ...

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