Control method, control device, and recording medium

A non-transitory computer-readable recording medium has stored therein a program that causes a computer to execute a control process. The control process includes: receiving an access request for a recording device that stores data; determining whether or not index information corresponding to the access request, which is received at the receiving, is stored in a memory that stores index information that is obtained by shortening identification information identifying data from the recording device cached in a non-volatile memory; and accessing the non-volatile memory when it is determined that the index information is stored in the memory and accessing the recording device when it is determined that the index information is not in the memory.