42 results about "Fault tolerant network" patented technology

At least one embodiment of this invention pertains to an abstraction layer that provides a consistent interface, with client-side and server-side implementations, to allow web client to interact with other web clients (that are connected to a common interactive event) in real-time over standard web ports without the web clients being tied to a specific real-time communications platform. At least some embodiments described herein contemplate methods and systems for establishing web communication among multiple web clients by providing a layer of abstraction between the web clients and the interactive session using interfaces to an Open Real-Time Connectivity (ORTC) layer. The system may use authentication methods to validate the web communications. The system may be implemented on a scalable, load-balanced, and fault-tolerant network.

A system and method for replacing file system processors, also known as hot swapping, is described. The system and method operate on a fault-tolerant network file system that includes a first file server that is operably connected to a network fabric and a second file server that is operably connected to the network fabric. The fault-tolerant network file system includes a first disk array that is operably coupled to the first file server and to the second file server and a second disk array that is operably coupled to the first file server and to the second file server. First file system information is loaded on the first file server. The first file system information includes a first intent log of proposed changes to first metadata. Second file system information is loaded on the second file server. The second file system information includes a second intent log of proposed changes to second metadata. The first file server has a copy of the second metadata, and the second file server maintains a copy of the first metadata, thereby allowing the first file server to access files on the second disk array in the event of a failure of the second file server.

A data communication system and an associated network node implementation is disclosed that, in certain embodiments, uses single-channel bi-directional communication links between nodes to send frames of data. The network nodes can be connected together in a ring or daisy chain topology with data frames sent in alternating directions through the bi-directional links. Such networks initially configured in a physical ring topology can tolerate single point failures by automatically switching to a logical daisy chain topology.

A data communication system and an associated network node implementation is disclosed that, in certain embodiments, uses single-channel bi-directional communication links between nodes to send frames of data. The network nodes can be connected together in a ring or daisy chain topology with data frames sent in alternating directions through the bi-directional links. Such networks initially configured in a physical ring topology can tolerate single point failures by automatically switching to a logical daisy chain topology.

A system and method for providing a fault-tolerant remote controlled computing device. A multi-tasking operating system and at least one primary process are executed on the computing device. A first monitor process determines whether any primary process is in a fault state. In response to any primary process being in a fault state, the first monitor process resolves the fault state of each such primary process. In certain embodiments, a local copy of a common configuration file and multimedia content are stored on the computing device. The computing device polls a server at pre-determined time intervals via a public Internet connection for updates to one or more processes, the local copy of the common configuration file, and the multimedia content. In response to updates being available from the server, the computing device downloads one or more updates via a fault-tolerant network connection and plays the multimedia content based on instructions contained within the local copy of the central configuration file. In one configuration, a user-defined notification system is provided which allows users to define threshold values. Once the threshold values are satisfied, one or more users may be notified.

A system and method are disclosed for providing a fault tolerant network service. A packet is received that corresponds to a flow from a forwarding agent at a primary service manager and instructions are determined at the primary service manager for handling packets corresponding to the flow. The instructions are sent to the forwarding agent and the instructions are stored at the primary service manager. A replication packet is sent to a backup service manager. The replication packet includes the instructions for handling packets corresponding to the flow.

At least one embodiment of this invention pertains to an abstraction layer that provides a consistent interface, with client-side and server-side implementations, to allow web client to interact with other web clients (that are connected to a common interactive event) in real-time over standard web ports without the web clients being tied to a specific real-time communications platform. At least some embodiments described herein contemplate methods and systems for establishing web communication among multiple web clients by providing a layer of abstraction between the web clients and the interactive session using interfaces to an Open Real-Time Connectivity (ORTC) layer. The system may use authentication methods to validate the web communications. The system may be implemented on a scalable, load-balanced, and fault-tolerant network.

A system and method for replacing file system processors, also known as hot swapping, is described. The system and method operate on a fault-tolerant network file system that includes a first file server that is operably connected to a network fabric and a second file server that is operably connected to the network fabric. The fault-tolerant network file system includes a first disk array that is operably coupled to the first file server and to the second file server and a second disk array that is operably coupled to the first file server and to the second file server. First file system information is loaded on the first file server. The first file system information includes a first intent log of proposed changes to first metadata. Second file system information is loaded on the second file server. The second file system information includes a second intent log of proposed changes to second metadata. The first file server has a copy of the second metadata, and the second file server maintains a copy of the first metadata, thereby allowing the first file server to access files on the second disk array in the event of a failure of the second file server.

Recovery systems and methods for sustaining the operation of a plurality of networked computers (20a,20b) in the event of a fault conditions are described. The basic recovery system comprises a plurality of virtual machines (31a,31b) installed on a recovery computer (30), each virtual machine being arranged to emulate a corresponding networked computer, and the recovery computer being arranged, in the event of a detected failure of one of the networked computers, to activate and use the virtual machine which corresponds to the failed networked computer (20). The recovery computer (30) may be located on the same network (12) as the networked computers (20), or alternatively on a remotely located local network in case of failure of the entire local network (12).

A method for fast protection in a fault-tolerant network includes coupling an edge switch in a network to one or more access switches via at least first and second redundant links, respectively connected to first and second ports of the edge switch. The first port is placed in an active state, while the second port is placed in a blocking state, so that communication traffic is conveyed over the first link, and each of the switches builds a respective database for use in forwarding the traffic. Responsive to a failure associated with the first link, the second port is placed in the active state and the first port is placed in the blocking state. Dummy traffic is then sent from the edge switch over the second link to the one or more access switches, so as to cause each of the one or more access switches to modify its respective database responsive to the second port being in the active state.

A method of providing a fault tolerant network, the network comprising a plurality of interconnected network nodes, the method comprising: determining an automorphism of the network; and periodically storing the current state of each network node at the corresponding network node of the automorphic image whilst each network node is substantially fault free.

An autonomous management cluster of network elements serves as a distributed configuration repository. Network elements sharing a common pre-determined shared identifier autonomously form themselves as a management cluster. The network elements in the cluster exchange configuration files. In the event of a loss, destruction, or corruption of one of the network element's configuration file, the network element recovers its configuration file from its closest neighbor in its management cluster. The management cluster can also be used to efficiently disseminate configuration changes by simply communicating the changes to one or more elements in the cluster, and allowing the other nodes in the cluster to discover and retrieve their updated configuration files.

The invention discloses a fault-tolerant network switch, which comprises more than two network switch units and a high-reliability (without single-point failure) interconnection unit. In a normal working state, two network switch units process network data packets; if one network switch unit fails, the other one undertakes all works to guarantee continuous work at the cost of possibly reducing some performances. The failed network switch unit can be replaced and then the network can be recovered to the state before the failure; moreover, the replacement of the failed network switch unit does not influence the other working network switch unit or network connection.

The present invention provides a method and apparatus for facilitating communication with non-fault tolerant network nodes in a fault-tolerant network environment. In various embodiments, a network address or network location of any network nodes present on a network that are not fault-tolerant is determined and stored, and data intended for the detected non-fault-tolerant network nodes is routed only over that network to which the non-fault-tolerant network node is connected. In further embodiments, the fault-tolerant network comprises a primary and redundant network with fault tolerant network nodes that are attached to each network; a non-fault-tolerant network node that is attached to either the primary or redundant network is then operable to communicate with any fault-tolerant network node via data sent over only the network to which the non-fault-tolerant network node is connected.

Methods and apparatus for implementation of fault-tolerant networks provide a network fault-tolerance manager for detecting failures and manipulating a node to communicate with an active channel. Failure detection incorporates one or more methods, including message pair and link pulse detection. Failure recovery includes switching all node data communications to a stand-by channel or switching just those nodes detecting a failure. Communication between nodes provides the distributed detection, with detecting nodes reporting failures to their network fault-tolerance manager and the network fault-tolerance manager broadcasting the failure recovery to all nodes. The network fault-tolerance manager is middleware, residing with each node in a logical hierarchy above a physical layer of a network and below a transport layer of the network. The approach is particularly suited to Ethernet LANs and capable of using commercial off-the-shelf network components.

A method and system for pseudo-random testing a fault tolerant network for determining the network's response to failure includes generating an image of the network on a host. At least one path of the network is selected to be physically failed through the use of a random number generator such that the selection is done pseudo-randomly. The part is then failed and the network's response to the failure is detected and all attempts to repair the failure logged up to and including the first successful attempt to repair the failure. In the event of a failure to repair a path occurs, the test is stopped, a repair effected, and the test restarted at the point the failure to repair occurred.

A first mobile station (MS) in a disruption tolerant network (DTN) reports, to an infrastructure network, contact pattern information comprising identities and indications of times at which the other MSs and infrastructure devices were determined to be within direct communication range of the first MS. The first MS then receives a set of DTN routing rules for routing communications to any target device via the DTN network. The first MS detects a first communication for transmission to a target device via the DTN network and identifies as a function of the set of the DTN routing rules, one or more but less than all intermediary MSs for storing and forwarding the first communication towards the target device. The first MS then transmits the first communication to the identified one or more intermediary MSs when they are determined to be within direct wireless communication range.

The invention discloses an asynchronous fault-tolerant network-on-chip router design method. The method is based on the quasi delay insensitive logic, utilizes a four-phase handshake protocol and a 1-of-4 coding method, and combines fault-tolerant hardware design of a routing computation unit, that is, according to the relative position relationship of current nodes and target nodes and with the path having the least hops being the target, a data packet is routed by passing fault areas. The method in the invention helps to reduce the area and power consumption cost, reduce the average delay, improve the overall performance of the network, has good expandability and fault-tolerant capability, and is suitable for a large-scale globally-asynchronous and locally synchronization system.

Devices, systems and methods for managing communications traffic on a fault tolerant network are disclosed. The exemplary system may include a fault tolerant network with at least two nodes and at least two channels of communication. Each channel of communication is in communication with each of the two nodes. Each node selectively communicates on one of the plurality of channels. A switch is in communication with the at least two channels. The switch receives network traffic and terminates network traffic on one or more of the channels. The termination of network traffic causes a fault tolerance manager to reroute network traffic on one of the two communication channels based on received network traffic.

A system and method for establishing communication over a network includes devices, instructions, and / or operations for: executing a browser application within a web browser, the web browser including a security mechanism for restricting access to and from the browser application; receiving, by the browser application, a private network address of an endpoint device; establishing a first network socket connection and a second network socket connection between the browser application and an application; and sending loss-sensitive network traffic over the first network socket connection and loss-tolerant network traffic over the second network socket connection.

The invention provides a routing method, equipment and system for a delay tolerant network. The method includes: the node type of a node carrying a message is determined according to the source of the message; if the node carrying the message is a source node, the message is forwarded to every met adjacent node; if the node carrying the message is an intermediate node, the message is forwarded to other met adjacent nodes except the adjacent node forwarding the message to the itself, wherein the social feature similarity of the other adjacent nodes and a target node is larger than the social feature similarity of the intermediate node and the target node. By the routing method, equipment and system for the delay tolerant network, the message is forwarded to the nodes similar to the target node step by step, the message is transmitted to the target node fast, and routing efficiency is increased.

A packet processing method using a multiple fault tolerant network structure capable of performing communication of a whole ring and disusing a useless packet when a fault occurs on a plurality of connection lines and nodes by using a dual ring structure. Nodes are connected as a ring shape separately having two input lines and two output lines, and each node selects one packet after receiving two inputs and disuses the other packet and transmits the select packet through the two output lines at the same time. The present invention can solve the fault problem occurred on a multiple link or nodes, can perform network function efficiently by disusing a useless packet, accordingly it is possible to perform stable operation for several years or several decades after the network installation and decrease maintenance expenses.

The invention discloses a deadlock-free adaptive routing method and relates to the technical field of high-performance servers. The method comprises that accesses from source nodes to destination nodes are selected according to a negative selection strategy and the logical connection relation between the source nodes and the destination nodes; N exchangers in a first sub-network of a fault-tolerant network are numbered from 0 to N-1, and N exchangers in a second sub-network are numbered from N to 2N-1; and a link exists between the two exchangers in different networks if modulus values of node numbers of the two exchangers in the different networks to N are identical. By means of the deadlock-free adaptive routing method, deadlock-free adaptive routing is achieved in structural fault-free networks.

A fault tolerant network architecture employs a network node including a first network interface to an addressable network. The first network interface is assigned a first network interface IP address defined by a first IP address range. The network node also includes at least one virtual IP address defined by an IP address range outside of the first IP address range. At least one virtual address is advertised to the addressable network from the first network interface, and packets addressed to the at least one virtual IP address can be routed to the first network interface.

Embodiments of the present invention provide a computer fault-tolerant system and method. In one embodiment, the computer fault-tolerant system comprises: a plurality of fault-tolerant units, wherein each of the fault-tolerant units is communicatively connected with at least one adjacent fault-tolerant unit to form an automatic fault-tolerant network. The fault-tolerance unit comprises: a task distributor and an error sensor. The error sensor of each fault-tolerance unit is configured to monitor in real time whether a working state of the fault-tolerance unit is normal; when an abnormal working state of any fault-tolerance unit is detected, the task distributor transmits the broadcast to search available free fault-tolerant units; and when receiving a response to the broadcast from at least one free fault-tolerant unit, the task distributor selects one of the free fault-tolerant units and assigns the tasks of the fault-tolerant unit in an abnormal working state to the selected one of the free fault-tolerance units.

The invention discloses an industry real-time control Ethernet redundancy fault tolerance network system and a method, including at least two control domains and at least one public domain connected with all control domains, wherein, each control domain adopts multipoint crossed redundancy ring network structure, core nodal point equipments on cross points are all connected with primary nodal point equipment and backup nodal point equipment of the public domain. On the basis of the prior ring network redundancy, the invention also realizes the redundancy of the core equipments needing external communication; when a primary core exchanger fails, a core exchanger which works in the backup mode is switched to work in the primary mode, the switch time is quite short. The invention also increases the double redundancy function of a public domain exchanger, the RSTP protocol is applied to the connection between the public domain and the control domains, which considers requirements on quickness as well as simpleness. In the invention, the core exchanger of the control domains adopts the ACL or the cross VLAN to replace a special bridge, thereby reducing equipment category and possible fault points and lowering delay.

The invention relates to a fault-tolerant enhanced network video information processing system and method. The fault-tolerant enhanced network video information processing system comprises a client side, a gateway server and a network video information server; the gateway server comprises a receiving and sending module, an analysis module, a conversion module, a configuration module, an error judgment module and a spelling error correction module. When the configuration module cannot be completely matched to a corresponding video information interface address, proximity search is not carried out, error correction operation is carried out, a corrected URL is obtained for reconfiguration till complete matching is achieved, and the situation that due to the fact that the fault-tolerant coefficient is too large and video information not confirming to videos is spread, the impression is reduced is avoided.