Elastic Volume Service (EVS) is a scalable virtual block storage service based on the distributed architecture. You can perform operations on an EVS disk without interrupting EVS services. The method for using an EVS disk is the same as that for using hard disks on traditional servers. The EVS disk provides high data reliability and I/O throughput and is easy to use. Therefore, it can be used by file systems, databases, and other system software or applications that require block storage devices.
An EVS disk is also called a virtual disk.