August 2018
Intermediate to advanced
598 pages
13h 22m
English
Content preview from Data Center Virtualization Certification: VCP6.5-DCV Exam Guide
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Explaining features of Pluggable Storage Architecture (PSA)
The PSA framework (introduced in vSphere 4.0) is a collection of VMkernel APIs that allow partners to insert specific functions into the ESXi storage layer.
Previously, we documented the architecture of PSA and NMP, so now, let's consider its features.
When coordinating the VMware NMP and any installed third-party MPPs, the PSA performs the following tasks:
- Provides logical device and the physical path I/O statistics
- Loads and unloads multipathing plugin
- Implements logical device bandwidth sharing between VMs
- Hides VM specifics from a particular plugin
- Routes I/O requests for a specific logical device to the MPP managing that device
- Handles I/O queuing to the logical devices
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