ITR/CISE: LOCKSS

高度可靠的信息基础设施要求系统具有可大规模复制、故障缓慢和抗攻击的特点。LOCKSS系统使用了新的技术来提高可靠性，这些技术在这一领域显示出更广泛的适用性和越来越重要的前景，包括：从参加“民意调查”的大量复制品而不是参加选举的少数复制品建立一个容错系统。限制系统的运行速度，以限制它发生故障的速度。建立一个在不要求保密的情况下抵抗“坏人”活动的系统，该系统和其他点对点系统的经验表明，使系统工作的真正挑战只有在现实的操作规模和在真实的网络上运行时才会变得明显。LOCKSS系统目前在互联网上运行，全世界有60个同行。该项目将利用这一LOCKSS试验台来调查需要进一步工作的领域。

A highly dependable information infrastructure requires systems that are massively replicated, slow to fail, and resistant to attack. The LOCKSS system uses novel techniques for increasing dependability that show promise of wider applicability and increasing importance in this area, including:Building a fault-tolerant system from a large number of replicas that take part in "opinion polls" rather than a small number of replicas that take part in elections.Limiting the speed at which the system operates in order to limit the speed at which it can fail.Building a system that resists the activities of the "bad guy" without requiring that secrets be kept, in part by using public communication and a reputation system.Experience with this and other peer-to-peer systems shows that the real challenges of making systems work only become apparent at a realistic operational scale and running on real networks. The LOCKSS system is now running on the Internet with 60 peers worldwide. The project will exploit this LOCKSS test-bed to investigate areas in which further work is needed.