Mechanism for enabling enhanced fibre channel error recovery across redundant paths using SCSI level commands

A method comprising:

• associating a first command identifier with a first command,
• transmitting the first command via a first link;
• detecting a failure of the first link;
• transmitting at least a portion of the first command and first command identifier via a second link;
• prior to transmitting at least a portion of the first command and first command identifier via the second link, requesting a status of execution of the first command, receiving the status of execution of the first command, requesting recovery starting at a next byte following a last byte previously received and receiving acknowledgement of acceptance of the recovery request;
• wherein associating the first command identifier with the first command comprises making the first command identifier explicit in the first command.

A computer program product having one or more computer readable media with computer readable program code stored thereon, wherein said computer readable program code is configured to cause a device programmed with the program code to perform the method comprising:

• associating a first command identifier with a first command;
• transmitting the first command via a first link;
• detecting a failure of the first link;
• transmitting at least a portion of the first command and first command identifier via a second link;
• and
• prior to transmitting at least a portion of the first command and the first command identifier via the second link, requesting a status of execution of the first command, receiving the status of execution of the first command, requesting recovery starting at a next byte following a last byte previously received and receiving acknowledgement of acceptance of the recovery request.