近日，葡京娱乐场官方网站 计算机系柴云鹏老师的论文《PLC-Cache: Endurable SSD Cache for Deduplication-based Primary Storage》被MSST 2014 (30th International Conference on Massive Storage Systems and Technology)作为长文录用。MSST每年只接收14篇左右的长文，长文录用率只有10%左右，非常难得。

存储领域目前最重要的国际会议有两个：一是USENIX FAST，另一个是MSST。MSST的历史非常悠久，从存储系统的早期阶段就开始举办，目前已经有30年的历史，大多数作者来自美国的著名高校或IBM、Netapp等存储领域的顶尖企业，其研究成果对存储领域的发展起到重要推动作用，在工业届有很大影响力。会议将于2014年6月在美国硅谷中心地带的圣克拉拉大学举办。这是本校教师第一次在该会议上发表论文。

该文针对目前发展迅速的数据去重（data deduplication）存储系统，提出了PLC-Cache算法来解决其中SSD缓存所面临的写入量过多所带来的性能下降和寿命缩短的问题，PLC-Cache的性能比经典的LRU算法提高23.4%，并可以延长SSD缓存的使用寿命长达15.7倍。

论文的摘要为： Data deduplication techniques improve cost efficiency by dramatically reducing space needs of storage systems.SSD-based data cache has been adopted to remedy the declining I/O performance induced by deduplication operations in the latency-sensitive primary storage. Unfortunately, frequent data updates caused by classical cache algorithms (e.g., FIFO, LRU, and LFU) inevitably slow downSSDs’ I/O processing speed while significantly shortening SSDs’ lifetime. To address this problem, we propose a new approach – PLC-Cache – to greatly improve the I/O performance as well as write durability of SSDs. PLC-Cache is conducive to amplifying the proportion of the Popular and Long-term Cached (PLC) data,whichis infrequently written andkept in SSD cache in a long time period to catalyze cache hits, in an entire SSD written data set. PLC-Cache advocates a two-phase approach. First, non-popular data are ruled out from being written into SSDs. Second, PLC-Cache makes an effort to convertSSD written data into PLC-data as much as possible. Our experimental results based on a practical deduplication system indicate that compared with the existing caching schemes, PLC-Cache shortens data access latency by an average of 23.4%. Importantly, PLC-Cache improves the lifetime of SSD-based caches by reducing the amount of data written to SSDs by a factor of 15.7.