METHOD OF OPERATING A SHARED NOTHING CLUSTER SYSTEM

摘要

Operating a shared nothing cluster system (SNCS) in order to perform a backup of a data element. The SNCS includes at least a first and a second storage node connected via a first network of the SNCS. The first and second storage nodes are configured to store a first set and a second set of blocks, respectively, in which the first and second set of blocks form a single data element. A backup server is connected to the first and second storage nodes, and the backup server includes a backup information table. The first and second storage nodes are configured to act as backup clients in a client-server configuration involving the backup server, upon receiving at the first and the second storage nodes a request to backup the data element. For each node of the first and second storage nodes, the node identifies one or more block sequences of consecutive blocks in a set of blocks of the data element stored in the node. The node sends the identified one or more block sequences to the backup server, and generates backup information.

主权项

1. A method of operating a shared nothing cluster system, the shared nothing cluster system comprising at least a first and a second storage node connected via a first network of the shared nothing cluster system, the first and second storage nodes being configured to store a first set and second set of blocks respectively, wherein the first and second set of blocks form a single data element, the method comprising:
providing a backup server being connected to the first and second storage nodes, the backup server comprising a backup information table; configuring the first and second storage nodes to act as backup clients in a client-server configuration involving the backup server; based on receiving at the first and second storage nodes a request to backup a data element, for each node of the first and second storage nodes:
identifying by the node one or more block sequences of consecutive blocks in a set of blocks of the data element stored in the node;sending by the node the identified one or more block sequences to the backup server;generating by the node backup information indicating at least:
an order of each block in each of the one or more block sequences;an order of each of the one or more block sequences in the one or more block sequences, andthe node and the data element;sending by the node the backup information to the backup server;storing by the backup server each received block sequence of the one or more block sequences in a respective storage location in the backup server;creating by the backup server for each of the received one or more block sequences an entry in the backup information table, wherein the entry comprises at least the storage location of the block sequence and associated backup information in the backup server;adding and setting by the backup server a first flag into at least one of the created entries, based on a complete reception and storage of the one or more block sequences; and based on a determination by the backup server that the first and second sets of blocks are associated with the first flag, adding and setting a second flag to at least one of the created entries for the first and second set of blocks indicating a completion of the backup of the data element.