vCenter Server 5.0升级到5.5
升级vCenter Server一、vCenter Server升级期间的停机时间:
在升级vCenter Server 时，vCenter Server 需要停机
vCenter Server 的预计停机时间如下：
1、升级需要
vCenter Server 停止工作 40 至 50 分钟，具体取决于数据库的大小。在这段时间中，数据库架构升级大约需要 10 至 15 分钟。此预计不包括升级后的主机重新连接。
如果计算机上未安装 Microsoft .NET Framework，则在启动 vCenter Server 安装之前需要重新引导。
2、VMware Distributed Resource Scheduler 在升级过程中无法工作。VMware HA 在升级过程中可以工作。
vCenter Server管理的ESX/ESXi主机不需要停机时间，在主机上运行的虚拟机也不需要停机时间
二、升级之前检查兼容性列表：
http://www.vmware.com/resources/compatibility/sim/interop_matrix.php
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三、升级vCenter Server之前，关闭相应服务
运行vCenter Host Agent Pre-Upgrade Checker检查必备条件
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四、备份相应文件
备份Single Sign-On服务器：
无，安装失败会回滚，备份方案只适用于vSphere 5.1版本，操作如下：
1、在源计算机上，打开 vCenter Server 中的命令提示符，然后将目录更改为
vCenter_Server_installation_directory\Infrastructure\SSOServer\scripts
2、键入cscript sso-backup.wsf /z
备份Inventory Service服务器：
1、右键单击 VMware vCenter
Inventory Service 并选择停止。
2、在源计算机上，打开 vCenter Server 中的命令提示符，然后将目录更改为
vCenter_Server_installation_directory\Infrastructure\Inventory Service\scripts 。
3 在提示符下运行以下命令备份 Inventory Service 数据库。
Windows：backup.bat -file backup_file_name
Linux：
/usr/lib/vmware-vpx/inventoryservice/scripts/
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备份vCenter Server服务器：
在升级到 vCenter Server 5.5 之前，请先备份 vCenter Server 系统上的 SSL 证书。SSL 证书的默认位置是
%allusersprofile%\Application Data\VMware\VMware VirtualCenter
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以及数据库
升级须知：
1、VMware建议您在升级生产环境之前，了解每一阶段的不可逆更改
2、如果vSphere部署使用vCenter Server Heartbeat，则需单独按vSphere Server Heartbeat指南，单独升级相关组件
3、vCenter Server 5.5不在支持Windows Server 2008 SP1，支持SP2
4、了解升级所需硬件资源与软件资源，资源不足，可能会存在服务不可用的情况
升级完vCenterServer之后，再逐步升级相关组件包括VMware Update Manager（方便之后的主机更新、虚拟机硬件更新）及其他组件
在升级之前，可参考vCenter Server 5.5.0a发行说明：
http://www.vmware.com/cn/support/support-resources/pubs/vsphere-esxi-vcenter-server-pubs/vsphere-vcenter-server-550a-release-notes.html
这里面会有一些升级中可能会遇到的问题
安装SSO：
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Web Client安装：
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清单服务：
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vCenter Server安装：
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默认不填，使用本地账户
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之后则是主机、组件与虚拟机的升级更新。
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