Storage apparatus, storage system, and data read method

摘要

An object of the invention is to prevent command response timeout occurring until the virtual disk library apparatus starts data transfer to a host computer, and to reduce the cache capacity provided in the virtual disk library apparatus. The invention provides a storage apparatus (3) including a first storage device (6A) for storing and reading data and a second storage device (7) having a lower data read speed than that of the first storage device, wherein the first storage device maintains a head portion of data and transmits the maintained data to a host computer (2), and the second storage device maintains the entire data and transmits data subsequent to its head portion to the host computer.