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Erasure correcting codes are widely used to ensure data persistence indistributed storage systems. This paper addresses the simultaneous repair ofmultiple failures in such codes. We go beyond existing work (i.e., regeneratingcodes by Dimakis et al.) by describing (i) coordinated regenerating codes (alsoknown as cooperative regenerating codes) which support the simultaneous repairof multiple devices, and (ii) adaptive regenerating codes which allow adaptingthe parameters at each repair. Similarly to regenerating codes by Dimakis etal., these codes achieve the optimal tradeoff between storage and the repairbandwidth. Based on these extended regenerating codes, we study the impact oflazy repairs applied to regenerating codes and conclude that lazy repairscannot reduce the costs in term of network bandwidth but allow reducing thedisk-related costs (disk bandwidth and disk I/O).

Repairing Multiple Failures with Coordinated and Adaptive Regenerating Codes