A method and apparatus for testing and simulating an access control policy are disclosed. Evaluating an access control policy may be performed by utilizing a deny statement that causes the access request to be rejected despite actions indicated in the access request being authorized. Further, an independent simulation environment may be utilized for testing access control policy evaluation.

Methods and systems are presented for providing data consistency in a distributed data storage system using an eventual consistency model. The distributed data storage system may store data across multiple data servers. To process a request for writing a first data value for a data field, a first data server may generate, for the first data value, a first causality chain representing a data replacement history for the data field leading to the first data value. The first data server may insert the first data value without deleting pre-existing data values from the data field. To process a data read request, multiple data values corresponding to the data field may be retrieved. The first data server may then select one data value based on the causality chains associated with the multiple data values for responding to the data read request.

Methods and systems are disclosed for optimizing record placement in a graph by minimizing fragmentation when writing data. Issues with fragmented data within a graph database are addressed on the record level by placing data that is frequently accessed together contiguously within memory. For example, a dynamic rule set may be developed based on dynamically analyzing access patterns of the graph database, policies, system characteristics and/or other heuristics. Based on statistics regarding normal query patterns, the systems and methods may identify an optimal position for certain types of edges that are often traversed with respect to particular types of nodes.

Techniques are provided for implementing a persistent memory storage tier to manage persistent memory of a node. The persistent memory is managed by the persistent memory storage tier at a higher level within a storage operating system storage stack than a level at which a storage file system of the node is managed. The persistent memory storage tier intercepts an operation targeting the storage file system. The persistent memory storage tier retargets the operation from targeting the storage file system to targeting the persistent memory. The operation is transmitted to the persistent memory.

In one embodiment, a storage device that is installable in an electronic apparatus includes a first communication interface for connecting the electronic apparatus to the storage device, a nonvolatile memory for storing data and data management table storing a data size and address information for the data stored in the nonvolatile memory, and a processor configured to change at least one piece of data stored in the nonvolatile memory without changing file management information stored in the data management table. The processor is configured to change the stored data without receiving an instruction to do so from the electronic apparatus through the first interface.

A printing system includes a digital front end (DFB) system connected to a plurality of printing devices. The DFE system manages printing operations to the plurality of printing devices. The DFE system also includes a printing device connectivity manager to manage connections with the printing devices. Printing connectivity modules are installed at the printing device connectivity manager using application programming interfaces (APIs) that are loaded at the creation of the printing connectivity modules. The DFE system also includes a display device connectivity manager to manage connections with display devices using display connectivity modules and display connectivity APIs. The DFE system also includes a storage connectivity manager to manage data storage and storage devices using storage connectivity modules and storage connectivity APIs.

The present disclosure is drawn to, among other things, a method of managing a magnetoresistive memory (MRAM) device. In some aspects, the method includes receiving a configuration bit from a write mode configuration register. In response to determining the configuration bit is a first value, the MRAM device is operated in a NOR emulation mode. In response to determining the configuration bit is a second value, the MRAM device is operated in a persistent memory mode.

A two pin communication interface bus and control circuits are used with circuit boards, integrated circuits, or embedded cores within integrated circuits. One pin carries data bi-directionally and address and instruction information from a controller to a selected port. The other pin carries a clock signal from the controller to a target port or ports in or on the desired circuit or circuits. The bus may be used for serial access to circuits where the availability of pins on ICs or terminals on cores is minimal. The bus is used for communication, such as serial communication related to the functional operation of an IC or core design, or serial communication related to test, emulation, debug, and/or trace operations of an IC or core design.

Techniques are provided for implementing a persistent memory storage tier to manage persistent memory of a node. The persistent memory is managed by the persistent memory storage tier at a higher level within a storage operating system storage stack than a level at which a storage file system of the node is managed. The persistent memory storage tier intercepts an operation targeting the storage file system. The persistent memory storage tier retargets the operation from targeting the storage file system to targeting the persistent memory. The operation is transmitted to the persistent memory.

Techniques are provided for implementing a persistent memory storage tier to manage persistent memory of a node. The persistent memory is managed by the persistent memory storage tier at a higher level within a storage operating system storage stack than a level at which a storage file system of the node is managed. The persistent memory storage tier intercepts an operation targeting the storage file system. The persistent memory storage tier retargets the operation from targeting the storage file system to targeting the persistent memory. The operation is transmitted to the persistent memory.