Control path failover in an automated data storage library

A system for managing retry commands communicated between a host computer and an automated data storage library, said system comprising:

• one or more control paths used for communication between said host computer and said automated data storage library;
• a library controller for controlling said automated data storage library;
• said host computer adapted for sending a command to said automated data storage library using one of said one or more control paths;
• said host computer adapted for sending a retry of said command to said automated data storage library using any of said one or more control paths;
• said automated data storage library adapted for receiving and decoding said command;
• and
• said automated data storage library adapted for sending a command completed response to said host computer without executing said retry of said command if said command was already executed in response to said command sent to said automated data storage library using said one of said one or more control paths.

A computer program product on a computer-readable medium usable with a programmable computer, said computer program product having computer readable program code embodied therein for managing retry commands communicated between a host computer and an automated data storage library, said host computer communicating with said automated data storage library using one or more control paths, said automated data storage library including a library controller for controlling said automated data storage library, said computer program product comprising:

• computer readable program code which causes said host computer to send a command to said automated data storage library using one of said one or more control paths;
• computer readable program code which causes said host computer to send a retry of said command to said automated data storage library using any of said one or more control paths;
• and
• computer readable program code which causes said automated data storage library to receive and decode said command;
• computer readable program code which causes said automated data storage library to send a command completed response to said host computer without executing said retry of said command if said command was already executed in response to said command sent to said automated data storage library using said one of said one or more control paths.