The invention discloses a data processing method and device, which belongs to the technical field of a computer. The method comprises the steps of: receiving a write data request carrying data to be write written and a corresponding storage array address sent by a host computer; inquiring whether the storage array address has a corresponding shared storage pool address or not according to a predetermined mapping table, wherein the mapping table is used to record a mapping relation between the storage array address and the shared storage pool address; if so, writing the data to be write written into a shared storage pool accordion according to the corresponding shared storage pool address; and if not, writing the data to be write written into the corresponding storage array according to the corresponding storage array address. According to the method which comprises the steps of inquiring whether the storage array address has the corresponding shared storage pool address or not according to the predetermined mapping table and writing the data to be write written into the shared storage pool or the corresponding storage array according to the inquiry result, failure of storage of the data to be write written caused by insufficient storage space of the corresponding storage array is avoided, so that the operational continuity of service of the host computer is ensured.