Thomas T Palumbo

US Patent:

8312237, Nov 13, 2012

Filed:

May 27, 2010

Appl. No.:

12/789166

Inventors:

Leila Koziy - Braintree MA, US
Thomas M. Palumbo - Sutton MA, US

Assignee:

Autonomy, Inc. - San Francisco CA

International Classification:

G06F 12/00

US Classification:

711162

Abstract:

Methods of providing access to data are presented. The method includes providing a storage grid which includes a source chain of storage nodes and a target chain of storage nodes, the source chain including a primary source node and a secondary source node which operates as a data mirror of the primary source node, and the target chain including a primary target node and a secondary target node which operates as a data mirror of the primary target node. The method also includes initially storing data on the source chain, the primary source node of the source chain maintaining a primary source copy of the data, and the secondary source node of the source chain maintaining a secondary source copy of the data. The method further includes relocating the data from the source chain to the target chain, the primary target node of the target chain maintaining a primary target copy of the data, and the secondary target node of the target chain maintaining a secondary target copy of the data, access to the data being continuously provided from the storage grid to an external device before, during, and after relocation of the data from the source chain to the target chain.