交易层
Web_1
Web_2
Web_3
Web_4
Web_5
应用层
CMS_1 CMS_2 CMS_3 CMS_4 CMS_5
数据库层
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DB2_1
DB2_2
第一代高可用性解决方案
传统配置方式
Public Network
Active Active
App App App
Fail App Back Required! App App App App
N + 1 切换结构 – 最佳方案 N Active Servers with 1 Spare • Least cost for greatest performance • Best possible configuration • “Roaming” spare New
300 125 175
300 150 150
150 75+75 0
VCS 集群管理
使用一个控制台，就可以管理多个平台（OS）上的 Cluster
使用方便：Java管理界面或Web 浏览器界面
管理方便： – 同时管理多个 clusters, nodes and resource group. 所有平台上的管理界面和命令行完全相同
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跨平台统一管理
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集群管理
* NNTP Virtual Servers are not supported in this release
A system has one agent per resource type that monitors all resources of that type; for example, a single IP agent manages all IP resources.
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全面的功能
资源的依赖关系、服务组的依赖关系 灵活的资源监控及切换方法（应用监控、本地重起控制….) 简单地自创建客户化Agent Cluster Simulator仿真功能，让客户熟悉系统、实验配置 正确性 Fire Drill功能让客户可以进行容灾演习
安装、配置、管理简单易用 支持计划停机和非计划停机的群集


强大的SAN环境支持
支持广泛的应用软件 采用高速 GAB 和 LLT 技术

可靠的远程高可用环境支持能力
VERITAS Cluster Server
功能特点
简单的安装配置、精密可靠的控制
Cluster 的安装配置在一个节点上即可完成 配置文件简单，只需在一个节点上配置，然后自动同步到 整个群集内的所有节点 服务组创建模板 全局性的、精密的状态控制机制，避免误切换 可靠的数据库状态监控机制
App
App App
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VERITAS 高可用产品进化图
Brief History of VERITAS Cluster Server
– – – – – AxxION H.A. (OpenVision) VERITAS First Watch VERITAS Cluster Server VERITAS Global Cluster Manager VERITAS Global Cluster Option
SG-NBU
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VCS 部件构成
Resources
Agents Resource Dependencies Service Groups LLT GAB
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What is a Resource?
A Resource is a hardware or software component being managed by VCS. Typically, each resource is defined in VCS by how to start (online), stop (offline), and monitor it.
Oracle B: 125 Load Oracle E: 75 Load Oracle D: 75 Load Oracle F: 75 Load
Oracle E: 75 Load
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What is an Agent?
A VCS process that controls resources; an agent may:
– on-line and off-line resources – monitor resources – provide application-specific fault management
VERITAS Cluster Server 部件构成
服务组 Service Group
一个应用服务跟与其相关的资源联系在一起 客户机 应用服务 SG-Web SG-NFS Win98 SG-Oracle SG-SAP 服务器 Node A Node B Node C Node D 共享磁盘
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VERITAS Cluster S（IBM,SUN,HP,Windows NT/2K)
跨平台统一管理 支持各种集群结构


提供极强的扩展能力 - 32 节点
App App
App App Spare App Spare
N to N 切换结构 All Active Servers – No Spare • Requires advanced support from cluster App • Complex App App App • Maximum use App App App of hardware
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集群管理
基于任务（ roles-based）的安全管理方式 Wizard：简化使用
详细的管理操作日志
logging 和 debugging 功能 支持本地和远程管理模式
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Sample Resources are – Disk Groups – IP Addresses – Applications
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Resource Types
All resources of similar characteristics are collectively called a resource type
App App
App App Spare App Spare
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当前集群系统的各种结构
对称式 切换结构 Two Active Servers • Least cost (perceived) • Least performance • Most complex N to 1 切换结构 N Active Servers with 1 Spare • Relies on hardware availability • Dedicated spare
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应用服务的管理

Oracle A: 100 Load Oracle C: 150 Load
多结点/多服务的集群 无限制的服务组(service groups) 服务组的切换不会造成相互影响 基于策略的切换 基于负荷的切换 简单管理服务的启动、停止和切换
App App App
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当前集群系统的各种结构
对称式 切换结构 Two Active Servers • Least cost (perceived) • Least performance • Most complex N to 1 切换结构 N Active Servers with 1 Spare • Relies on hardware availability • Dedicated spare Fail App Back Required! App App App App
Active Active