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vSphere High Performance Essentials by Christian Stankowic

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Utilizing virtual flash resources

In vSphere 5.5, a technology called vSphere Flash Read Cache (vFRC) was introduced; this makes it possible to utilize SSDs that are attached to the ESXi hosts as page target for the host itself and as read cache for VMs running on it. Locally attached SSD drives are grouped in a vFRC pool where various virtual flash resources can be located. This technique can significantly improve the performance of read-intensive workloads.

Note

The vFRC feature requires a vSphere Enterprise Edition license.

The vFRC uses a special filesystem to store data, it is not replicated across the ESXi hosts. When using for an ESXi host, the flash resources are used in case the host is overloaded and needs to page out the memory resources. ...

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