Data access method, device, system and equipment and storage medium

The invention provides a data access method, device and system, equipment and a storage medium. The first data storage service and the second data storage service belong to different storage mechanisms, and are used for storing at least part of the same data respectively and providing data access services for a plurality of applications; and the applications respond to the write requests, executewrite operations corresponding to the write requests for the second data storage service and delete original data corresponding to the write requests in the first data storage service under the condition that the write operations are executed successfully; under the condition that the applications cannot write for the first data storage service, the method includes recording the to-be-deleted datainformation of the original data of which the applications cannot execute the deletion operation for the first data storage service, and setting the plurality of applications to be unreadable for thefirst data storage service