Patent ID: 8370672
Filing Date: 2013-02-05
Classification: G06F,Y02D

Abstract:
1. A storage system for storing a plurality of data objects, each data object comprising at least one chunk of data and the system comprising: a plurality of chunk servers arranged to store multiple blocks of data derived from each chunk of data; a metadata service arranged to store mappings between data objects and chunks of data; and a versioned store, wherein the system is arranged to operate in one of a plurality of modes of operation, the plurality of modes of operation comprising: a first mode in which a first number of blocks of data derived from a chunk of data are available, and at least one reduced power mode in which a reduced number of blocks of data derived from the chunk of data are available and in which a subset of the chunk servers are in a low power state, and wherein the versioned store is arranged to store multiple versions of any data written when the system is in a reduced power mode of operation.