Abstract: Generally described, systems and methods are provided for monitoring and detecting causes of failures of network paths. The system collects performance information from a plurality of nodes and links in a network, aggregates the collected performance information across paths in the network, processes the aggregated performance information for detecting failures on the paths, analyzes each of the detected failures to determine at least one root cause, and initiates a remedial workflow for the at least one root cause determined. In some aspects, processing the aggregated information may include performing a statistical regression analysis or otherwise solving a set of equations for the performance indications on each of a plurality of paths. In another aspect, the system may also include an interface which makes available for display one or more of the network topology, the collected and aggregated performance information, and indications of the detected failures in the topology.

Abstract: Generally described, systems and methods are provided for monitoring and detecting causes of failures of network paths. The system collects performance information from a plurality of nodes and links in a network, aggregates the collected performance information across paths in the network, processes the aggregated performance information for detecting failures on the paths, analyzes each of the detected failures to determine at least one root cause, and initiates a remedial workflow for the at least one root cause determined. In some aspects, processing the aggregated information may include performing a statistical regression analysis or otherwise solving a set of equations for the performance indications on each of a plurality of paths. In another aspect, the system may also include an interface which makes available for display one or more of the network topology, the collected and aggregated performance information, and indications of the detected failures in the topology.

Abstract: The transmission of data on computer networks according to one or more policies is disclosed. A policy may specify, among other things, various parameters which are to be followed when transmitting initiating network traffic. Multiple network interfaces may be installed on a server to enable transmission of data from the single server according a number of discrete configuration settings implicated by the various policies. The multiple network interfaces may correspond to separate physical components, with each component configured independently to implement a feature of a policy. The multiple network interfaces may also correspond to a single physical component that exposes multiple network interfaces, both to the network and to the server on which it is installed.

Abstract: The transmission of data on computer networks according to one or more policies is disclosed. A policy may specify, among other things, various parameters which are to be followed when transmitting initiating network traffic. Multiple network interfaces may be installed on a server to enable transmission of data from the single server according a number of discrete configuration settings implicated by the various policies. The multiple network interfaces may correspond to separate physical components, with each component configured independently to implement a feature of a policy. The multiple network interfaces may also correspond to a single physical component that exposes multiple network interfaces, both to the network and to the server on which it is installed.

Abstract: The transmission of data on computer networks according to one or more policies is disclosed. A policy may specify, among other things, various parameters which are to be followed when transmitting initiating network traffic. Multiple network interfaces may be installed on a server to enable transmission of data from the single server according a number of discrete configuration settings implicated by the various policies. The multiple network interfaces may correspond to separate physical components, with each component configured independently to implement a feature of a policy. The multiple network interfaces may also correspond to a single physical component that exposes multiple network interfaces, both to the network and to the server on which it is installed.

Abstract: Generally described, systems and methods are provided for monitoring and detecting causes of failures of network paths. The system collects performance information from a plurality of nodes and links in a network, aggregates the collected performance information across paths in the network, processes the aggregated performance information for detecting failures on the paths, analyzes each of the detected failures to determine at least one root cause, and initiates a remedial workflow for the at least one root cause determined. In some aspects, processing the aggregated information may include performing a statistical regression analysis or otherwise solving a set of equations for the performance indications on each of a plurality of paths. In another aspect, the system may also include an interface which makes available for display one or more of the network topology, the collected and aggregated performance information, and indications of the detected failures in the topology.

Abstract: The transmission of data on computer networks according to one or more policies is disclosed. A policy may specify, among other things, various parameters which are to be followed when transmitting initiating network traffic. Multiple network interfaces may be installed on a server to enable transmission of data from the single server according a number of discrete configuration settings implicated by the various policies. The multiple network interfaces may correspond to separate physical components, with each component configured independently to implement a feature of a policy. The multiple network interfaces may also correspond to a single physical component that exposes multiple network interfaces, both to the network and to the server on which it is installed.

Abstract: Implementations are described of a computing device that migrates data and software applications from a first computing device to a second computing device, in order to preserve data and other application-related customizations.

Abstract: The transmission of data on computer networks according to one or more policies is disclosed. A policy may specify, among other things, various parameters which are to be followed when transmitting initiating network traffic. Multiple network interfaces may be installed on a server to enable transmission of data from the single server according a number of discrete configuration settings implicated by the various policies. The multiple network interfaces may correspond to separate physical components, with each component configured independently to implement a feature of a policy. The multiple network interfaces may also correspond to a single physical component that exposes multiple network interfaces, both to the network and to the server on which it is installed.

Abstract: Implementations are described of a computing device that migrates data and software applications from a first computing device to a second computing device, in order to preserve data and other application-related customizations.

Abstract: A set of techniques is described for enabling a user of a virtual resource to specify to the hosting system a preferred performance parameter such as throughput, latency, CPU utilization, or the like. The hosting system then dynamically tunes the underlying resources to favor the preferred performance parameter. Tuning the settings may include adjusting various batching and moderating processes that are available on the hosting device, such as enabling/disabling interrupt coalescing, enabling/disabling segmentation offload, increasing or decreasing the size of a ring buffer used to share data between several resources, batching input/output (I/O) operations and the like. For example, if the user has indicated that lower latency is preferable, the hosting system may disable interrupt coalescing; whereas if the user has indicated that higher throughput should be favored, the hosting system may enable interrupt coalescing.

Abstract: The transmission of data on computer networks according to one or more policies is disclosed. A policy may specify, among other things, various parameters which are to be followed when transmitting initiating network traffic. Multiple network interfaces may be installed on a server to enable transmission of data from the single server according a number of discrete configuration settings implicated by the various policies. The multiple network interfaces may correspond to separate physical components, with each component configured independently to implement a feature of a policy. The multiple network interfaces may also correspond to a single physical component that exposes multiple network interfaces, both to the network and to the server on which it is installed.

Abstract: Implementations are described of a computing device that migrates data and software applications from a first computing device to a second computing device, in order to preserve data and other application-related customizations.

Abstract: Disclosed are various embodiments for mitigating congestion in networks employing flow-based hashing to assign flows to routes. A flow of packets is sent from a source endpoint to a destination endpoint by way of a network. The flow of packets is associated with flow identification information. It is detected whether congestion is affecting the flow of packets in the network. A perturbation to the flow identification information for the flow of packets is effected in response to determining that congestion is affecting the flow of packets in the network.

Abstract: Disclosed are various embodiments for avoiding flow collisions in networks employing flow-based hashing to assign flows to routes. A flow of packets is sent from a source endpoint to a destination endpoint by way of a network. The flow is associated with flow identification information including, for example, a source port, a source network address, a destination port, and a destination address. It is determined whether to perturb the flow identification information for the flow to avoid flow collisions caused by flow-based hashing performed in the network. A state associated with the flow is updated to effect a perturbation to the flow identification information for the flow if the flow identification information for the flow is to be perturbed.

Abstract: The transmission of data on computer networks according to one or more policies is disclosed. A policy may specify, among other things, various parameters which are to be followed when transmitting initiating network traffic. Multiple network interfaces may be installed on a server to enable transmission of data from the single server according a number of discrete configuration settings implicated by the various policies. The multiple network interfaces may correspond to separate physical components, with each component configured independently to implement a feature of a policy. The multiple network interfaces may also correspond to a single physical component that exposes multiple network interfaces, both to the network and to the server on which it is installed.

Abstract: An array of backup battery units that can be reconfigured to provide different currents and/or voltages depending upon load conditions. The backup battery units are attached to a bus and can be reconfigured, for example, between a configuration in which the battery backup units are wired in series to a configuration where the battery backup units are wired in parallel. Additional embodiments are directed to an array of backup battery units that can isolate a single battery backup unit so that the battery backup unit can be removed from the bus while the bus is under load. The removed battery backup unit can then be tested, maintained, and/or replaced.

Abstract: A backup battery unit that can be reconfigured to provide different currents and/or voltages depending upon load conditions. The backup battery unit can be reconfigured, for example, between a configuration in which battery cells for the battery unit are wired in series to a configuration where the battery cells are wired in parallel. Additional embodiments are directed to a backup battery unit that can isolate a battery cell and remove the cell from a circuit for the battery while the battery is under load or being charged. The isolated cell can then be serviced or tested.

Abstract: Generally described, systems and methods are provided for monitoring and detecting causes of failures of network paths. The system collects performance information from a plurality of nodes and links in a network, aggregates the collected performance information across paths in the network, processes the aggregated performance information for detecting failures on the paths, analyzes each of the detected failures to determine at least one root cause, and initiates a remedial workflow for the at least one root cause determined. In some aspects, processing the aggregated information may include performing a statistical regression analysis or otherwise solving a set of equations for the performance indications on each of a plurality of paths. In another aspect, the system may also include an interface which makes available for display one or more of the network topology, the collected and aggregated performance information, and indications of the detected failures in the topology.

Abstract: Systems and methods for handling battery backup resources in a computer system differently in certain situations, such as catastrophic events, based upon an assigned layer of the datacenter components to which the battery backup resource provides backup power. The layer can be based, for example, on criticality of the resource to the system. Less critical layers can shed load or gracefully shut down to respond to the event, and the battery resources can be reallocated or reconfigured to provide battery power to the more critical layers.