Abstract
Distributed storage systems store data redundantly at multiple servers that are geographically spread throughout the world. This basic approach would be sufficient in handling server failure due to natural faults, because when one server fails, data from healthy servers can be used to restore the desired redundancy level. However, in a setting where servers are untrusted and can behave maliciously, data redundancy must be used in tandem with Remote Data Checking (RDC) to ensure that the redundancy level of the storage systems is maintained over time.
All previous RDC schemes for distributed systems impose a heavy burden on the data owner (client) during data maintenance: To repair data at a faulty server, the data owner needs to first download a large amount of data, re-generate the data to be stored at a new server, and then upload this data at a new healthy server. We work on a new concept, namely, server-side repair, in which the servers are responsible to repair the corruption, whereas the client acts as a lightweight repair coordinator during repair. We propose two novel RDC schemes for replication-based distributed storage systems,
Finally, we evaluate the performance of the two schemes. For the
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