A method for maximizing I/O requests to a target port is provided. The method includes a storage controller obtaining an initiator allowed queue depth, receiving an I/O request and a current sequence identifier from an initiator logged into the target port, and determining if the initiator allowed queue depth is equal to a first queue depth corresponding to the initiator. If the initiator allowed queue depth is equal to the first queue depth then returning a queue full indication and a maximum sequence identifier equal to the current sequence identifier to the initiator. If the initiator allowed queue depth is not equal to the first queue depth then placing the I/O request on a queue, incrementing the first queue depth, and adjusting the maximum sequence identifier. Adjusting the maximum sequence identifier includes adding the current sequence identifier to the initiator allowed queue depth and subtracting the first queue depth.