摘要：Distributed File system was widely used as a cloud computing backend storage with high scalability, low cost, and reasonable sequential I/O performance. VDI I/O workload is mostly composed of small random I/O and distributed file system does not have enough performance for this I/O pattern. Compensating for this gap, we applied a cache using memory and SSD (Solid State Drive) to distributed file system. This cache was implemented in the file system’s client side. It uses memory as write cache and SSD as read cache with write-back policy for minimizing the I/O response time. Based distributed file system was implemented on user-level using Fuse (File system in User space) framework.
