VMware vSphere Storage APIs Array Integration (VAAI)

Publisher : VMware
Latest Version : March 17, 2013
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"In a virtualized environment, storage operations traditionally have been expensive from a resource perspective. Functions such as cloning and snapshots can be performed more efficiently by the storage device than by the host. VMware vSphere Storage APIs “ Array Integration (VAAI), also referred to as hardware acceleration or hardware offload APIs, are a set of APIs to enable communication between VMware vSphere ESXi hosts and storage devices. The APIs define a set of œstorage primitives that enable the ESXi host to offload certain storageoperations to the array, which reduces resource overhead on the ESXi hosts and can significantly improve performance for storage-intensive operations such as storage cloning, zeroing, and so on. The goal of VAAI is to help storage vendors provide hardware assistance to speed up VMware I/O operations that are more efficiently accomplished in the storage hardware."