abnormal detection, schedule tuningCloud native Feature list • Features for Cluster • Features for CurveBS • Features for CurveFS • Features for monitorFeature list for cluster • Install / uninstall/ run on arbitrary PVs(local storage) as an alternative to host path • Support automatically detect new nodes, adding / removing nodes and disk drives • Support dynamic volume resizing • chunkserver Dynamic Volume Provisioning for CurveFS • Dynamice volume resizing • Support automatically detect new nodes, adding / removing nodes • Allow CurveBS and S3 automatically grow underneath CurveFS when

storage system https://www.opencurve.io/Agenda • What is Curve • Use Cases • CurveBS • Key Features • Comparing to Ceph • CurveFS • Comparing to Ceph • Current Status • RoadmapWhat is Curve class for kubernete, nbd for HOST/VMPerformance (vs. Ceph RBD)Performance (vs. Ceph RBD)CurveBS Features • RAFT for data consistency • minor impaction when chunk server fails • Precreated chunk file meta overhead increase read/write magnification PERFORMANCE High Need to optimize rocksdbCurveFS Features • CurveFS can manage storages (open cloud storage and on-prem storage) and expose unified file

maximum size of read requests© XXX Page 11 of 33 * must be set both here *and* passed to fuse_session_new() * using the ``-o max_read=`` mount option. At some point * in the future, specifying the mount the default umask value for pam_umask and is used by # useradd and newusers to set the mode of the new home directories. # 022 is the "historical" value in Debian for UMASK # 027, or even 077, could be -b7ba0ef33531 Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent 64bit flex_bg sparse_super

distributed shared storage services ● Polardb for PostgreSQL provides database services Solution features ● seperation between storage and computation ● The call method is the same as that of the standalone Key designs used by CURVE � CURVE Roadmap � CURVE Community � You can take awayCURVE Roadmap ● Features ○ Supports RDMA and SPDK ○ Further reduce I/O latency and improve throughput ○ Support data lifecycle

缓存层级分为fs->file->chunk->datacache 4层，通过inodeId找到file，通过index找到chunk，然后通过offset~len找到是否有合适的datacache或者new datacache。 对外接口 流程上对于读写缓存有影响的接口包括：write，read，releaseCache，flush，fssync。后面会详细介绍这些接口流程。这里不需要提供trun Adaptor), chunkCacheManager_(chunkCacheManager), chunkPos_(chunkPos), len_(len) { data_ = new char[len]; memcpy(data_, data, len); } virtual ~DataCache() { delete data_; 则一并获取 5. 如果有可写的DataCache，则调用Write接口将数据合并到DataCache中； ，加入到ChunkCacheManager的Map中。 如果没有可写的DataCache则new一个 5.完成后返回成功。 Read流程 1.根据请求offset，计算出对应的chunk index和chunkPos。将请求拆分成多个chunk的ReadChunk调用。 2.在ReadC

集群的配置不可避免会发生变更，比如替换宕机的机器。 直接配置变更可能出现双主问题 • 共同一致（joint consensus） • 集群先切换到一个过渡的配置(old + new)，一旦共同一 致已经被提交，系统切换到新的配置(new)。RAFT协议简介 日志压缩 • 日志会不断增长，占用空间 • 采用快照的方式压缩日志 • 在某个时间点，整个系统的状态都以快照的形式写入 到稳定的持久化存储中 done); void remove_peer(const PeerId& peer, Closure* done); void change_peers(const Configuration& new_peers, Closure* done); StateMachine void on_apply(::raft::Iterator& iter); void on_snapshot_save(SnapshotWriter*

cd /curve/ # 使用 gcc 编译 bazel build –config=gcc7-later … # use '-faligned-new' to enable C++17 over-aligned new support # 使用 clang 编译 CC=clang CXX=clang++ bazel build …2 制作镜像 docker run -v

in advance. 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 segments are allocated with a default size of 1GB (configurable >=1GB), so client requests MDS for new segment infrequently. For random write scenarios, it is possible to allocate space frequently at

*newname, unsigned int flags); rename有两种做法： 一是，向metaserver发起inode和dentry迁移，从parent迁移到new parent，并修改name为newname。 二是，在new parent创建新的inode和dentry，然后删除旧的parent下的inode和dentry 两者都涉及到rename的事务性的问题？（ ） 这里可能还需

Roadmap • MultiRaft optimization • ParallelRaft for write • Reduce write magnification for file new write • Cooperate with Alibaba to support high-performance polardb for postgresql using CurveBS