EMC
Hopkinton, MA, United States
Hopkinton, MA, United States
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Patent
Emc | Date: 2017-04-05

A flash module includes a top cover (200) and a bottom cover (210), a printed circuit board (PCB) (204) comprising memory (238), solid state storage (236), a storage controller configured to manage the memory and the solid state storage, and at least one integrated connector, and a capacitor (206), in which the capacitor is configured to power at least the storage controller when the flash module is disconnected from an external power source.


Patent
Emc | Date: 2016-04-12

Methods and apparatus are provided for block similarity based block level deduplication of data. An exemplary method comprises obtaining a deduplicated dataset comprising a plurality of unique data chunks; determining a number of differences between two of the unique data chunks; evaluating whether the number of differences satisfies a predefined similarity criteria (e.g., that the number of bit differences cannot exceed a specified limit); and storing metadata for a first one of the two unique data chunks if the predefined similarity criteria is satisfied for the two unique data chunks, wherein the metadata comprises a pointer to a second one of the two unique data chunks and bit differences between the two unique data chunks. The bit differences comprise an executable code and/or a bit mask. The predefined similarity threshold is optionally a tunable parameter. The first one of the two unique data chunks can be restored by processing the metadata.


Patent
Emc | Date: 2016-03-31

Embodiments of the present disclosure relate to a system, a computer program product and a method for synchronizing data between a source disk and a target disk in a cluster by performing synchronization between a source disk and a target disk, the synchronization being performed while a plurality of application I/Os on a plurality of nodes in a cluster are configured to access the source disk; and wherein a coordinator and a plurality of workers in the cluster are configured to manage copying data from the source disk to the target disk.


Structures and processes for garbage collection of search trees under Multi-Version Concurrency Control (MVCC). Such search trees may be used to store data within a distributed storage system. A process detects live search tree elements using tracing and then identify storage chunks having no live elements as garbage to be reclaimed. The process can be paused and resumed to reduce impact on other system processing.


Patent
Emc | Date: 2016-09-13

Embodiments of the present disclosure provide a method and apparatus of maintaining data consistency by receiving, when a first storage processor is in a Ready state, a request for configuration information of a storage object from a second storage processor; in response to receiving the request, setting the first storage processor to an Updating-Peer state, and sending the configuration information to the second storage processor to maintain consistency of the configuration information in the first and second storage processors; and in response to the configuration information being sent, setting the first storage processor back to the Ready state.


Techniques to backup collaboration server data are disclosed. A plurality of separate threads are used to back up a prescribed number of subsets of a dataset. Each subset of the prescribed number of subsets was determined by walking an associated directory in the prescribed order at a prior time with which a prior backup is associated. A separate thread is spawned to backup transaction logs associated with the dataset. A first pass backup of the transaction logs is performed in parallel with the backup of the prescribed number of subsets.


Patent
Emc | Date: 2016-09-13

The present application provides a method and apparatus of operating a shingled magnetic recording device that comprises a random access zone in which data is randomly readable and writable and a sequential access zone in which data is only sequentially readable and writable, and the sequential access zone is logically split into a plurality of banks operated independent of each other and storing a mapping from logical block addresses to physical block addresses in the random access zone; storing, in each bank of the plurality of banks in the sequential access zone, a respective part of a mapping from physical block addresses to logical block addresses; and operating the shingled magnetic recording device based on the mapping from logical block addresses to physical block addresses and the mapping from physical block addresses to logical block addresses.


Patent
Emc | Date: 2016-09-13

Embodiments of the present disclosure provide a method and apparatus for selecting an incremental backup approach by selecting a portion of a current snapshot of a file system; comparing the selected portion with a portion in a historical snapshot of the file system to determine a changed data rate of the file system, wherein the portion of the historical snapshot corresponds to the selected portion; and selecting an incremental backup approach based on the changed data rate for a backup of the file system.


Patent
Emc | Date: 2016-09-13

Embodiments of the present disclosure provide a method, computer program product and apparatus for a white-box testing by determining a code line being changed in a target version of codes, determining a function to which the code line belongs, determining, based on a first mapping from functions to test cases, a set of test cases corresponding to the function to which the code line belongs, thereby enhancing efficiency of automatic testing.


Patent
Emc | Date: 2016-08-24

Reconciling data is disclosed. It is determined whether a state of a first backup application is consistent with a state of a second backup application. In the event the state of the first backup application is not consistent with the state of the second backup application, the state of the first backup application is updated to be consistent with the state of the second backup application.

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