分布式块存储介绍材料.pptx

分布式块存储介绍;分布式块存储;概念1 分布式;概念2 块存储;概念3 网络存储;;;实例分析——开源分布式块存储sheepdog;Sheepdog cluster;整体架构;;整体架构;节点内部;Object Storage;Object 格式： Data object：虚拟盘镜像的chunk Vdi object： struct sheepdog_inode { char name[SD_MAX_VDI_LEN]; /* the name of this VDI*/ char tag[SD_MAX_VDI_TAG_LEN]; /* the snapshot tag name */ uint64_t ctime; /* creation time of this VDI */ uint64_t snap_ctime; /* the time snapshot is taken */ uint64_t vm_clock_nsec; /* vm clock (used for live snapshot) */ uint64_t vdi_size; /* the size of VDI */ uint64_t vm_state_size; /* the size of vm state (used for live snapshot) */ uint16_t copy_policy; /* reserved */ uint8_t nr_copies; /* the number of object redundancy */ uint8_t block_size_shift; /* info about the size of the data object */ uint32_t snap_id; /* the snapshot id */ uint32_t vdi_id; /* the vdi id */ uint32_t parent_vdi_id; /* the parent snapshot vdi id of this VDI */ uint32_t child_vdi_id[MAX_CHILDREN]; /* the children VDIs of this VDI */ uint32_t data_vdi_id[MAX_DATA_OBJS]; /* the data object IDs this VDI contains*/ }; Vmstate object：chunk Vdi attr object： The first SD_MAX_VDI_ATTR_KEY_LEN bytes (256 bytes) is the key name of this attribute. The rest of the object is the value of this attribute.;Read-only/writable objects Writable：只允许一个VM读写此对象而其他VMs不能访问； Read-only objects：可读但不能写 这是指虚拟机不能同一时间共享同一卷（volume）。这避免了写写冲突，简化了sheepdog系统的实现。 ;Gateway ;Object manager;Cluster manager;QEMU Block Driver;VDI 操作;Object recovery;Protocol ;Between sheep 和 qemu;between sheep and collie;between sheeps;Sheepdog线程模型;逻辑处理模型;节点管理;节点变化的处理;节点加入;节点离开;虚拟节点与一致性哈希;节点变化的影响;数据管理;数据的读写;拷贝修复;拷贝修复逻辑;Sheepdog面临的主要问题;安装sheepdog /collie/sheepdog/wiki/Getting-Started;InstallCompile or i