Data storage and preservation Outline ①Storage devices Existing devices Parallelizing files'storage o Striping Introduction to Map/Reduce Risks of data loss and corruption ④Data consistency o Checksums Practical usage ⑤Data safety oRedundancy Parity o Erasure coding 6 Conclusion 2/62 S.Ponce-CERNData storage and preservation 2 / 62 S. Ponce - CERN devices // risks consistency safety c/c Outline 1 Storage devices Existing devices 2 Parallelizing files’ storage Striping Introduction to Map/Reduce 3 Risks of data loss and corruption 4 Data consistency Checksums Practical usage 5 Data safety Redundancy Parity Erasure coding 6 Conclusion