分布式RAID中Cache模块的设计

Design of Cache module for distributed RAID

针对分布式RAID的特殊架构,设计了基于总线侦听方法的Cache模块。该模块采用主存分块映射策略来解决总线侦听方法,由于共享网络总线对带宽要求太高,使用较少带宽、较少的数据操作,提高了分布式RAID的系统性能。对Cache模块设计进行了性能分析,对多处理机系统Cache一致性问题的解决方案进行了分析比较。

Architecture of Distributed Redundant Arrays of Inexpensive Disks (DRD) is different from centralized RAID systems. Auther designed a Cache module based on snooping protocols in distributed RAID systems. Snooping protocols rely on a shared bus between processors for coherence, so snooping protocols require high bandwidth of the shared bus in multiprocessor systems. The main memory to several data blocks were divided and mirrored these data blocks in Cache.The designed Cache module requires less bandwidth of the network. Because it requires less data operation, the performance of the DRD system improves. This paper analyzed benchmark performance of the designed Cache module, and also compared the method to achieve coherence in designed Cache module with the methods to achieve coherence in multiprocessor system.