In a disk controller having a plurality of controller modules (CMs), the CM includes a path obstruction determination unit for obstructing a part in which an anomaly occurs when the anomaly occurs on a communication path for communications between CMs, and, when the plurality of CMs cannot communicate between them due to the obstruction of the part, for determining an object to be separated in a way that prioritizes a CM which retains data that has not been duplicated over a CM which retains dat...

A system includes proxy logic which detects situations which, unless action is taken, would result in undesirable bus behavior. In one embodiment, the target device of a bus cycle includes proxy logic which determines when the target device is unable to respond correctly to a bus cycle. In this situation, the proxy logic blocks a bus signal from being received by the addressed logic in the target device, thereby preventing the target device from responding at all. In another embodiment, proxy lo...

The present invention is a method, apparatus and program storage device for providing data path optimization for redundant data paths. The present invention provides data path optimization that increases the data access throughput and availability to a device by using multiple paths when a modification event occurs.

A system and method for identifying and isolating faults in a video on demand (VOD) provisioning system. Transaction errors statistics are used to determine whether a fault has occurred in the VOD provisioning system. A high transaction error rate is associated with transaction error rates in components of the VOD provisioning system permitting identification of a likely cause of a high transaction error rate. Remedial action to repair the cause of the system fault is then directed to the likely...

A microprocessor-controlled standard field device, such as a measuring sensor or an actuator, is connected to a field bus system that, in turn, is connected to, for example, a freely programmable controller. The field device is equipped with a security layer for carrying out a security proven communication. A secure and simultaneously cost-effective communication with a control device via a field bus system is made possible by implementing a security layer in, e.g., a conventional operationally ...

A method, apparatus, and computer program product are provided for implementing a receive function over an interconnect network, such as InfiniBand. A virtual lane (VL) with a pending packet for a queue pair (QP) is selected. Then the pending packet is checked for an exceptional condition. Responsive to identifying the exceptional condition for the pending packet, a state bit is set for freezing the selected VL; and an interrupt is generated to firmware. Responsive to receiving the interrupt, th...

The invention relates to error messaging in HTTP based communication systems. An intermediate device (20) interconnecting a wireless client terminal (10) and a web server (30) transforms error messages sent from the server before transmitting them to the client. Hereby, a first error status code from the server is transformed into an error description message comprising an error description text and second status code. The second status code preferably enforces display of the error description t...

A manager transmits an I/O bus signal to an I/O bus manager in a computer at a predetermined point of time to inform the I/O bus manager of occurrence of an I/O bus fault. The I/O bus manager initializes an I/O bus and then informs a CPU in the computer of the I/O bus fault as an interruption to be processed by an OS operated by the CPU, whereby the OS can acquire the fault information after the interruption even in the case where an I/O bus fault occurs.

A storage system includes at least one storage medium, at least one controller to control the storage medium, and a communication path to connect the storage medium and the controller in a loop for communication between the controller and the storage medium, wherein a failure diagnosis is performed to locate a failure while performing normal read/write operations.

An exemplary system for testing a serial port includes a serial port (106), a female cable connector (108) connected to the serial port, and an optical-coupled chip (110) connected to the female cable connector. The serial port, the female cable connector and the optical-coupled chip collectively form a circular loop. The system further includes a transmitting module (124), a receiving module (126) and a determining module (128). The transmitting module is configured for transmitting data into t...