Abstract: Techniques herein store database blocks (DBBs) in byte-addressable persistent memory (PMEM) and prevent tearing without deadlocking or waiting. In an embodiment, a computer hosts a DBMS. A reader process of the DBMS obtains, without locking and from metadata in PMEM, a first memory address for directly accessing a current version, which is a particular version, of a DBB in PMEM. Concurrently and without locking: a) the reader process reads the particular version of the DBB in PMEM, and b) a writer process of the DBMS replaces, in the metadata in PMEM, the first memory address with a second memory address for directly accessing a new version of the DBB in PMEM. In an embodiment, a computer performs without locking: a) storing, in PMEM, a DBB, b) copying into volatile memory, or reading, an image of the DBB, and c) detecting whether the image of the DBB is torn.

Abstract: Techniques herein store database blocks (DBBs) in byte-addressable persistent memory (PMEM) and prevent tearing without deadlocking or waiting. In an embodiment, a computer hosts a DBMS. A reader process of the DBMS obtains, without locking and from metadata in PMEM, a first memory address for directly accessing a current version, which is a particular version, of a DBB in PMEM. Concurrently and without locking: a) the reader process reads the particular version of the DBB in PMEM, and b) a writer process of the DBMS replaces, in the metadata in PMEM, the first memory address with a second memory address for directly accessing a new version of the DBB in PMEM. In an embodiment, a computer performs without locking: a) storing, in PMEM, a DBB, b) copying into volatile memory, or reading, an image of the DBB, and c) detecting whether the image of the DBB is torn.

Abstract: Systems, methods, and other embodiments associated with separating executables and working data of an application between separate images are described. In one embodiment, a method includes mounting an application image together with a working image to create an application directory for an application. The application image is read-only and includes at least an executable of the application and the working image includes working data modified by the application. The application directory provides files and paths of the files for the application together within a single unified directory while separating the executable in the application image from the working data in the working image. The method includes in response to receiving a write request to the application directory, arbitrating access to the application directory by controlling the processor to write data for the write request to the working image to maintain the working data separate from the executable of the application.

Abstract: Systems, methods, and other embodiments associated with separating executables and working data of an application between separate images are described. In one embodiment, a method includes mounting an application image together with a working image to create an application directory for an application. The application image is read-only and includes at least an executable of the application and the working image includes working data modified by the application. The application directory provides files and paths of the files for the application together within a single unified directory while separating the executable in the application image from the working data in the working image. The method includes in response to receiving a write request to the application directory, arbitrating access to the application directory by controlling the processor to write data for the write request to the working image to maintain the working data separate from the executable of the application.

Abstract: Methods, systems, and computer-readable media of data storage that include storing page identities of individual pages and logical relationships between pages are disclosed. A particular system includes a plurality of data storage devices. A storage manager is configured to store data as pages at the data storage devices. Each page includes a page payload and a page identity. The storage manager is also configured to store one or more relationships indicating logical order between pages.

Abstract: Systems, methods, apparatus and software can make use of standard input/output (I/O) interface commands to make information about virtual storage devices available to clients of those virtual storage devices. Where the storage virtualization is carried out using a switch, router, or other storage network appliance, the information about virtual devices is stored (and in many cases determined and/or processed) local to the device. Applications operating on the storage clients can conveniently access the information using I/O interface commands and need not have access to some or all of the software or functionality that virtualizes the storage.

Abstract: A system, method, and medium provide communication between a volume server and a volume owner in a distributed storage management system. A volume server may manage configuration information for a particular volume of storage. A volume owner may manage input/output (I/O) for the volume. The volume server may lease the configuration information to the volume owner using a communications protocol. The communications protocol comprises a plurality of operations for management of the lease. The volume owner may use the configuration information to manage the I/O for the volume.

Abstract: Storage services and systems are provided. Virtual disks include a number of storage states and are associated with storage operations that are provided with the virtual disks. Moreover, a storage management set of executable instructions is configured based on values assigned to the states when the storage operations are performed against the virtual disks. In some embodiments, a selection set of executable instructions permits the selective execution of the storage operations.

Abstract: Systems, methods, apparatus and software can make use of standard input/output (I/O) interface commands to make information about virtual storage devices available to clients of those virtual storage devices. Where the storage virtualization is carried out using a switch, router, or other storage network appliance, the information about virtual devices is stored (and in many cases determined and/or processed) local to the device. Applications operating on the storage clients can conveniently access the information using I/O interface commands and need not have access to some or all of the software or functionality that virtualizes the storage.

Abstract: Storage services and systems are provided. Virtual disks include a number of storage states and are associated with storage operations that are provided with the virtual disks. Moreover, a storage management set of executable instructions is configured based on values assigned to the states when the storage operations are performed against the virtual disks. In some embodiments, a selection set of executable instructions permits the selective execution of the storage operations.