for Cloud Native applications Xiang Dong Architect, Netease Hangzhou Research InstituteAgenda � Why develop storage Design objectives Achievements in CURVE Key designs used by CURVE CURVE Roadmap system maintenance are difficult in corner cases ○ Performance requirements cannot be metAgenda Why develop storage � Design objectives Achievements in CURVE Key designs used by CURVE CURVE Roadmap ● Thin provisioning storage pools ● High performance ● Easy maintenance ● Cloud NativeAgenda Why develop storage Design objectives � Achievements in CURVE Key designs used by CURVE CURVE Roadmap

When users write data, they only need to select an appropriate CopySet and create a new chunk. Why use a CopySet to manage data? 1. Reduce metadata. If the replication group membership is saved

1 基于SPDK的CurveBS PFS存储引擎10/17/22 2 Why ●为了减少使用cpu做内存copy，减少系统调用 ●发挥某些被操作系统屏蔽的功能，例如nvme write zero ●根据阿里《When Cloud Storage Meets RDMA》的说法 ●在100Gbps网络带宽时，内存带宽成为瓶颈 ●Intel Memory Latency Checker (MLC)测试得到的CPU内存带宽是

aft日志落盘存在瓶颈 ChunkServer性能优化主要是braft日志落盘优化，包括三个方面： 1、追加写改为覆盖写 2、写入时4KB对齐 3、改为O_DIRECT模式 How？ Why？新版本ChunkServer性能优化 1、模拟braft日志落盘方式的demo程序测试结果，latency为调用sync花费的时间（第一次新写，第二次覆盖写）; 2、因为在请求4KB的情况下，

# cd fsmount/ root@pubbeta1-nostest2:/tmp/fsmount# ls root@pubbeta1-nostest2:/tmp/fsmount# 参考文献 Why does root get Permission denied when accessing FUSE directory? man fuse 问题2：本地文件系统挂载默认是共享的？ 目前没