Hi Friend,
vStorage API is a marketing term :
The VMware vStorage API is actually a blanket umbrella term that encompasses 4 separate individual APIs, all with different functionalities:
- vStorage API for Data Protection (VADP)
- vStorage API for Site Recovery Manager (VASRM)
- vStorage API for Multi-pathing (VAMP)
- vStorage API for Array Integration (VAAI)
Refer : http://www.virtuallyghetto.com/2010/06/vstorage-api-do-you-really-know-what-it.html
Above blog explains nicely about vStorage APIs,