1. A system of distributed partitioned library mapping, comprising: a first controller connected to a host via first data transport medium operating according to a first protocol and a data transport element of a media library via a second data transport medium operating according to a second protocol, wherein the first controller: maintains a media library partition representing a portion of the media library; receives a command from a host application based on the media library partition; maps a logical address referenced in the command to a corresponding physical address based on the media library partition; forwards the command with the corresponding physical address; and a second controller connected to a media changer of the media library and the first controller, wherein the second controller: receives the command from the first controller; and forwards the command to the media changer.