Adaptive Quality of Security Control in Networked Parallel Disk Systems

Parallel disk systems, which have been widely used in building networked and data intensive applications, are highly scalable and can alleviate the problem of disk I/O bottleneck. Although a number of parallel disk systems have been developed, the systems lack a means to optimize quality of security for dynamically changing networked environments. We remedy this situation by proposing an adaptive quality of security control scheme for networked parallel disk systems (or ASPAD for short) that makes it possible for networked disk systems to adapt to changing security requirements and workload conditions. ASPAD is carried out in three phases: dynamic data partitioning, response time estimation, and adaptive security quality control. Hence, ASPAD is conducive to adaptively and expeditiously determining security schemes for disk requests in a way to improve security of networked parallel disk systems while making an effort to guarantee desired response times of the requests. To prove the efficiency of the proposed approach, we simulate a networked parallel disk system into which nine cryptographic schemes are integrated. Empirical results show that ASPAD significantly improves overall performance over an existing strategy with an average of 65%.