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Lonestar: An Energy-Aware Disk Based Long-Term Archival Storage System

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4 Author(s)
Grawinkel, M. ; Paderborn Center for Parallel Comput. PC2, Univ. of Paderborn, Paderborn, Germany ; Pargmann, M. ; Domer, H. ; Brinkmann, A.

We present the architecture for an disk based archival storage system and propose a new RAID scheme that is designed for "write once, read sometimes" workloads. By intertwining parity groups into a multi-dimensional RAID and improving the single disk reliability with intra-disk redundancy, the system achieves an elastic fault tolerance that can at least recover from all 3-disk failures. We do not stripe data to multiple disks and store related information to the same disks. Typically, all disks of the RAID are powered off, and for a read request, only a single disk has to be spun up, while write and rebuild processes require multiple disks. We analyzed our RAID scheme and showed that it provides a MTTDL that is orders of magnitudes higher than a set of RAID6 systems with a similar amount of disk drives. We also present and evaluate our prototype and show that it is well suited for archival scenarios.

Published in:

Parallel and Distributed Systems (ICPADS), 2011 IEEE 17th International Conference on

Date of Conference:

7-9 Dec. 2011