Abstract: The present invention generally relates to distributed data storage systems. In particular, the present invention is related to a method of data storing in a distributed data storage system that comprises a clustering of data blocks and the use of random linear combinations of data blocks that makes the distributed data store system efficient in terms of storage space needed and inter-device communication costs, both for the storage method, as for the associated repair method.

Abstract: A replication set of k storage devices is defined, that stores a particular data item. Each device in the replication set has an associated timer for which a timeout value for disconnection is determined based on individual downtime data distribution of the device. A new device for storing the data item is added to the replication set when the timer expires for a device in the replication set, and if the number of devices in the replication set that are still connected is below a predetermined threshold. Timeout values are adapted according to a factor of criticalness determined for the replication set, resulting in a more reactive, or on the contrary, a less reactive replacement of devices in the replication set. The factor of criticalness is determined according to a difference between the connected devices in the replication set and the predetermined number k.

Abstract: The present invention generally relates to distributed data storage systems. In particular, the present invention relates to a method of data placement in a distributed data storage system that combines high data availability with a low impact on network and data storage resources, in terms of bandwidth needed for exchange of data between network nodes and in terms of number of network nodes needed to store an item of data.

Abstract: The present invention generally relates to distributed data storage systems. In particular, the present invention relates to optimization of the distributed storage system in terms of number of data replicas needed to ensure a desired level of data replication.