53 results about "Local failure" patented technology

In one embodiment, a system comprises a plurality of nodes. On each node, a storage virtualization component may receive the I / O operations generated from local applications on the node. The storage virtualization component may transmit the I / O operation, and detect any failures that occur in the I / O operations. If a failure is detected, the storage virtualization component may cooperate with other storage virtualization components on other nodes to successfully complete an I / O operation that experiences a failure. In one embodiment, if the I / O operation is successful on a remote node, the storage virtualization component may migrate the application that sourced the I / O operation to the remote node. In other embodiments, the storage virtualization component may monitor I / O operations and migrate the application after a pattern of local failures and successes on the remote node.

Alternate multicast / broadcast paths may be calculated in a routed network to enable broadcast / multicast traffic to be transmitted around a local failure in the routed network until the routing system reconverges on a new network topography. According to an embodiment of the invention, the nodes on a multicast tree or a broadcast tree may compute alternate paths for each of the downstream nodes in the multicast / broadcast tree or for select nodes in the multicast / broadcast tree. The select nodes may be those nodes that have advertised membership in the multicast or a set number of hops downstream on the branch affected by the failure. The alternate paths may be unicast paths from the node to the other nodes on the multicast / broadcast tree. U-turn nodes may be used where there is no regular loop-free alternate network path to a node on the downstream multicast / broadcast tree.

Fault tolerance is provided in a distributed system. The complexity of replicas and rollback requests are avoided; instead, a local failure in a component of a distributed system is tolerated. The local failure is tolerated by storing state related to a requested operation on the component, persisting that stored state in a data store, such as a relational database, asynchronously processing the operation request, and if a failure occurs, restarting the component using the stored state from the data store.

Aspects of the invention relate to techniques for classifying memory failure bitmaps using both rule-based classification and artificial neural network-based classification methods. The rule-based classification method employs classification rules comprising those for global failure patterns. The artificial neural network-based classification method classifies local failure patterns. One of the artificial neural network models is the Kohonen self-organizing map model. The input vector for a failure pattern may contain four elements: pattern aspect ratio, failing bit ratio, dominant failing column number and dominant failing row number.

Disclosed are a rotation missing plot tracking system and method for a double-reflection-surface satellite antenna, which are used for solving the deficiency of an existing satellite antenna automatic tracking system, characterized by comprising a main reflection surface, a secondary reflection surface and a feed source, wherein the main reflection surface is provided with a servo tracking unit and a main control unit; the main reflection surface, the secondary reflection surface and the feed source are coaxially arranged; one of the main reflection surface and the secondary reflection surface can rotate around an axial centre and is provided with a rotation mechanism; and the rotating main reflection surface or secondary reflection surface is eccentrically provided with a signal local-failure zone. Compared with stepped tracking, the present invention has a high precision and is quick in response; compared with conical scanning tracking, a main reflection surface and a secondary reflection surface are coaxially arranged, thereby decreasing a side lobe, reducing the interference of an adjacent satellite and improving the applicability; and compared with single-pulse tracking, by using a rotating and eccentrical signal local-failure zone, a quasi-sinusoidal signal of a model intensity period change can be acquired, which has a simple device and a low cost.