Abstract:
Formulating an integrated disaster recovery (DR) plan based upon a plurality of DR requirements for an application by receiving a first set of inputs identifying one or more entity types for which the plan is to be formulated, such as an enterprise, one or more sites of the enterprise, the application, or a particular data type for the application. At least one data container representing a subset of data for an application is identified. A second set of inputs is received identifying at least one disaster type for which the plan is to be formulated. A third set of inputs is received identifying a DR requirement for the application as a category of DR Quality of Service (QoS) class to be applied to the disaster type. A composition model is generated specifying one or more respective DR QoS parameters as a function of a corresponding set of one or more QoS parameters representative of a replication technology solution. The replication technology solution encompasses a plurality of storage stack levels. A solution template library is generated for mapping the application to each of a plurality of candidate replication technology solutions. The template library is used to select a DR plan in the form of a replication technology solution for the application.
Abstract:
Provided are methods, apparatus arid computer programs for scheduling storage input and/or output (I/O) requests. A method for scheduling storage access requests determines a request processing sequence calculated to maximize SLA-based revenues achievable from processing a number of requests. A storage controller includes a scheduler which implements a revenue-based scheduling function to determine a revenue-maximizing processing sequence, and then assigns storage access requests to locations in a queue corresponding to the determined sequence. In an on-line mode, the scheduler can adapt to additional received requests, evaluating the revenue function for the additional requests and modifying the schedule if required. The method may include analysing a request stream to predict requests that are likely to be received in the near future, and taking account of the predicted requests when determining a processing schedule.
Abstract:
An SPM based measuring technique for measuring surface features of a sample fits a curve to a family of feature edge points acquired as a result of an SPM scan of the surface feature. If two curves are fit on opposed edges of the feature of interest, the maximum or minimum distance between those curves can be determined to ascertain a dimension of interest such as a maximum via width, a minimum line width, etc. The scan is preferably a relatively low-resolution scan in the Y direction, typically having 8-12 scan profiles passing through the feature of interest low-resolution, which is about half that typically used by prior techniques. The low-resolution scan can be performed relatively rapidly and with high repeatability. Repeatability is also higher than with prior techniques, and the level of repeatability is relatively insensitive to the resolution in the Y direction. Using a low-resolution scan also significantly reduces tip wear and increases throughput when compared to high-resolution scans.
Abstract:
A policy for a computer system is transformed into a plurality of sub-policies, at least one synchronization step, and a final action. The sub-policies are distributed to corresponding sub-components in the computer system. The sub-policies are evaluated, wherein each sub-component evaluates its corresponding one or more sub-policies as other sub-components evaluate their corresponding one or more sub-policies. The sub-policies are synchronized by using the at least one synchronization step. The final action is performed in response to synchronizing the sub-policies. The computer system can be singular or distributed.
Abstract:
A method and system for increasing server cluster availability by requiring at a minimum only one node and a quorum replica set of replica members to form and operate a cluster. Replica members, independent from the nodes, maintain cluster operational data. A cluster operates when one node possesses a majority of replica members, which ensures that any new or surviving cluster includes consistent cluster operational data via at least one replica member from the immediately prior cluster. Arbitration provides exclusive ownership by one node of the replica members, including at cluster formation, and when the owning node fails. Arbitration uses a fast mutual exclusion algorithm and a reservation mechanism to challenge for and defend the exclusive reservation of each member. A quorum replica set algorithm brings members online and offline with data consistency, including updating unreconciled replica members, and ensures consistent read and update operations.
Abstract:
Apparatus and methods to engage in a transfer of informational content between a first mobile electronic device and a second mobile electronic device using directed transmission between a first server and a second server. Additional apparatus, systems, and methods are disclosed.
Abstract:
An approach is provided in which a risk assessment is performed that accesses the risk to a user of an information handling system due to the user's link to a social network contact. Risky action values is received with the values corresponding to the social network contact. A risk level is calculated with the risk level corresponding to one or more of the risky action values. A preventative security action is then performed based on the calculated risk level. In another embodiment, an approach is provided in which the potential risks posed by a user are transmitted to the user's social network contacts. In this approach, potentially risky actions that are performed by the user are detected. Risky action values are identified that correspond to the detected potentially risky actions. The risky action values are then transmitted to the user's social network contacts over a computer network.
Abstract:
The invention relates to page fault handling in a virtualized computer system in which at least one guest page table maps virtual addresses to guest physical addresses, some of which are backed by machine addresses, and wherein at least one shadow page table and at least one translation look-aside buffer map the virtual addresses to the corresponding machine addresses. Indicators are maintained in entries of at least one shadow page table, wherein each indicator denotes a state of its associated entry from a group of states consisting of: a first state and a second state. An enhanced virtualization layer processes hardware page faults. States of shadow page table entries corresponding to hardware page faults are determined. Responsive to a shadow page table entry corresponding to a hardware page fault being in the first state, that page fault is delivered to a guest operating system for processing without activating a virtualization software component. On the other hand, responsive to a shadow page table entry corresponding to a hardware page fault being in the second state, that page fault is delivered to a virtualization software component for processing.
Abstract:
Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for selection of ranked configurations. In one aspect, a method includes providing a plurality of class definitions for selection, each class definition modeling a respective data or functional component of a cloud-based environment using a group of configurable class parameters, each class definition supporting instantiation and inheritance of the class definition in a configuration specification for a cloud-based deployment; deriving respective performance metrics associated with each of the plurality of class definitions based on aggregated performance of multiple cloud-based deployments, wherein the multiple cloud-based deployments had been carried out according to respective configuration specifications that require instantiation of the class definition or a new class definition derived from the class definition; and utilizing the respective performance metrics associated with each of the plurality of class definitions in ranking the plurality of class definitions.
Abstract:
A high-level object-oriented specification language allows configurable components of a cloud-based deployment to be modeled by a class definition that includes a group of configurable class parameters. The object-oriented specification language supports extension of an existing base class definition to create new class definitions, and supports inheritance of class parameters from the existing base class definition by the new class definitions. A cloud-based deployment can be customized based on class definitions used in configuring one or more generic deployments, such as by modifying class parameter values of the class definitions, varying interrelationships between the classes, and supplementing existing class parameters with new class parameters. The high-level object-oriented specification language supports class definitions that model hardware and virtual resources as well as software roles and service roles served by software applications and services in a cloud-based deployment. Syntax for specifying dependency and connectivity between classes is also provided.