SYSTEMS AND METHODS FOR REPAIR REDUNDANCY CONTROL FOR LARGE ERASURE CODED DATA STORAGE

摘要

Systems and methods which implement storage system data repair control techniques, such as may provide a feedback control structure for regulating source object redundancy and/or repair bandwidth in the storage system. Embodiments control a source object redundancy level to be used in a storage system by analyzing source objects represented in a repair queue to determine repair rate metrics for the source objects and determining a source object redundancy level based on the repair rate metrics. For example, embodiments may cause more redundant fragments for each source object to be generated and stored during repair where the repair rate metrics indicate an increase in storage node failure rate. Additionally, embodiments may determine a per storage object repair rate (e.g., a repair rate preference for each of a plurality of source objects) and select a particular repair rate (e.g., a maximum repair rate) for use by a repair policy.