Datadirect Networks, Inc.

John Gordon Manning

Michael Piszczek

Cedric T Fernandes

Donald Joseph Molaro

Jason Micah Cope

Pavan Kumar Uppu

Paul Joseph Nowoczynski

William Joseph Harker

Lee Douglas McBryde

David F Fellinger

Dave Fellinger

Thomas E Fugini

Lauren Belella

Manjari Mishra

Shivkumar Pandit

Pavan Kumar Kumar Uppu

John Albert De Leon

Systems and methods for reducing metadata in a write-anywhere storage system are disclosed herein. The system includes a plurality of clients coupled with a plurality of storage nodes, each storage node having a plurality of primary storage devices coupled thereto. A memory management unit including cache memory is included in the client. The memory management unit serves as a cache for data produced by the clients before the data is stored in the primary storage. The cache includes an extent cache, an extent index, a commit cache and a commit index. The movement of data and metadata is by an interval tree. Methods for reducing data in the interval tree increase data storage and data retrieval performance of the system.

Reducing metadata in a write-anywhere storage system

Data storage systems and methods for storing data are described herein. The storage system includes a first storage node is configured to issue a first delivery request to a first set of other storage nodes in the storage system, the first delivery request including a first at least one data operation for each of the first set of other storage nodes and issuing at least one other delivery request, while the first delivery request remains outstanding, the at least one other delivery request including a first commit request for each of the first set of other storage nodes. The first node causes the first at least one data operation to be made active within the storage system in response to receipt of a commit indicator along with a delivery acknowledgement regarding one of the at least one other delivery request.

Maintaining order and fault-tolerance in a distributed hash table system

A system for data migration between high performance computing architectures and data storage disks includes an intermediate data migration handling system which has an intermediate data storage module coupled to the computer architecture to store data received, and a data controller module which includes data management software supporting the data transfer activity between the intermediate data storage module and the disk drives in an orderly manner independent of the random I/O activity of the computer architecture. RAID calculations are performed on the data prior to storage in the intermediate storage module, as well as when reading data from it for assuring data integrity, and carrying out reconstruction of corrupted data. The data transfer to the disk drives is actuated in sequence determined by the data management software based on minimization of seeking time, tier usage, predetermined time since the previous I/O cycle, or fullness of the intermediate data storage module. The storage controller deactivates the disk drives which are not needed for the data transfer.

System and method for data migration between high-performance computing architectures and data storage devices with increased data reliability and integrity

A method for auto-correction of errors in an array of solid-state storage devices having a plurality of storage channels dedicated to storing parity data to provide fault tolerance for a loss of at least two of the plurality of storage channels. A read operation from the storage channels transfers data to a plurality of channel memories. The data in the channel memories is checked to confirm the data is valid. Responsive to detection of invalid data, the data may be tested to identify the storage channel in error, including sequentially excluding data read form a different one of the plurality of channel memories from a parity check and determining the validity of data from remaining channel memories. If valid data is obtained, the storage channel from which the data was excluded is identified as the storage channel in error.

Method for auto-correction of errors in a solid-state memory system

A latency reduction method for read operations of an array of N disk storage devices () having n disk storage devices (A-H) for data storage and p of disk storage devices (I,J) for storing parity data is provided. Utilizing the parity generation engine's () fault tolerance of for a loss of valid data from at least two of the N disk storage devices (A-J), the integrity of the data is determined when N&#x2212;1 of the disk storage devices (A-J) have completed executing a read command. If the data is determined to be valid, the missing data of the Ndisk storage device is reconstructed and the data transmitted to the requesting processor (). By that arrangement the time necessary for the Ndisk storage device to complete execution of the read command is saved, thereby improving the performance of memory system ().

Method for reducing latency in a raid memory system while maintaining data integrity

A method for auto-correction of errors in an array of disk storage devices having a plurality of disk storage devices dedicated to storing parity data to provide fault tolerance for a loss of at least two of the plurality of disk storage devices. A read operation from the storage channels transfers data to a plurality of disk channel memories. The data in the disk channel memories is checked to confirm the data is valid. Responsive to detection of invalid data, the data may be tested to identify the disk storage channel in error, including sequentially excluding data read from a different one of the plurality of disk channel memories from a parity check and determining the validity of data from remaining disk channel memories. If valid data is obtained, the disk storage channel from which the data was excluded is identified as the disk storage channel in error.

Method for auto-correction of errors in a RAID memory system

In a data storage system, failed disk drives are switched temporarily off-line to be quickly rebuilt by executing a journaling/rebuild algorithm which tracks the updates to the failed disk drive into a journal structure created in a non-volatile memory. The journal information is used to update those data sections of the disk drive affected by updates after the disk drive is failed. The journal information is stored in bit maps indicating which portions of the disk drive have been updated with new data while the disk was failed. As an option, the system permits verification of data consistency on the data section of the disk drive which have not been affected by the updates. The journaling/rebuild of failed disks is applicable, among others, to RAID data storage systems.

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Ellicott City, MD, United States of America

John Gordon Manning