Flashcache是facebook释放出来的开源的混合存储方案,用ssd来做cache提升IO设备的性能.很多硬件厂商也有类似的方案，比如说LSI raid卡. 但是这个方案是免费的软件方案，而且经过产品的考验，具体参见： 主页：https://github.com/facebook/flashcache 开源混合存储方案(Flashcache)：http://blog.yufeng.info/archives/1165 Flashcache新版重大变化：http://blog.yufeng.info/archives/1429 但是flashcache在使用中很多人会有个误区，导致性能很低。首先我们看下flashcache的设计背景和适用场景： Introduction : ============ Flashcache is a write back block cache Linux kernel module. This document describes the design, futures ideas, configuration, tuning of the flashcache and concludes with a note covering the testability hooks within flashcache and the testing that we did. Flashcache was built primarily as a [...]