Design and implementation of a self-securing storage device

Self-securing storage prevents intruders from undetectably tampering with or permanently deleting stored data. To accomplish this, self-securing storage devices internally audit all requests and keep all versions of all data for a window of time, regardless of the commands received from potentially compromised host oper-ating systems. Within the window, system administrators are guaranteed to have this valuable information for intrusion diagnosis and recovery. The S4 implementation combines log-structuring with novel metadata journaling and data replication techniques to minimize the performance costs of comprehensive versioning. Experiments show that self-securing storage devices can deliver performance that is comparable with conven-tional storage. Further, analyses indicate that several weeks worth of all versions can reasonably be kept on state-of-the-art disks, especially when dierencing and compression technologies are employed. The authors would like to thank the member companies of the Parallel Data Consortium (CLARiiON Array Development