ERROR DETECTION AND RECOVERY FOR SEQUENTIAL ACCESS DEVICES IN A FIBRE CHANNEL PROTOCOL

摘要

A method and system for detecting and correcting error conditions on sequential devices in a private loop direct access fibre channel network. An initiator device (INITIATOR) for initiating an appropriate sequence level recovery determines the state of an exchange with a target device (TARGET). An overdue target response is determined by using a timer (2" R_A_TOV), in conjunction with internal driver state information, for indicating that packet information may have been lost. The initiator requests (RES) exchange and sequence state information from the target, for determining the need for corrective action. Needed corrective action is then taken by the initiator, such as resending sequence information (FCP_DATA_0, FCP_DATA_1, FCP_DATA_2), requesting (SRR) that the target resend sequence information (FCP_DATA), or providing early indication to an upper level protocol that an error has occurred.