原文地址：
很多客户遇到过这样的情况：由于RAC其中一个节点的主机OS损坏，需要重装。而重装后怎样把节点加回集群呢？
这里将涉及的步骤整理如下：
1. 清除重装主机的OCR条目（这里以节点2重装为例，请将node2换成您节点2的主机名）
# crsctl delete node -n node2
要检查上述步骤是否成功，在尚存节点执行"olsnodes"即可，重装的主机不应该出现在它列出的清单里。
以grid用户执行
$ olsnodes2. 从OCR中删除重装主机的VIP信息
在尚存节点上执行：
$ /grid/bin/srvctl remove vip -i node2-v -f3. 清除重装主机的GI和DB home的inventory信息：
在尚存节点执行：
1)GI
$ /grid/oui/bin/runInstaller -updateNodeList ORACLE_HOME=/grid "CLUSTER_NODES=node1" CRS=TRUE -silent -local
注：这里CLUSTER_NODES是写尚存节点的清单2）在db home下执行同样的步骤:
$ /home/oracle/app/oracle/product/11.2.0/dbhome_1/oui/bin/runInstaller -updateNodeList ORACLE_HOME=/home/oracle/app/oracle/product/11.2.0/dbhome_1/ CLUSTER_NODES=node1 -silent -local4. 下面开始添加节点。运行CVU检查：
./cluvfy stage -pre nodeadd -n node2 -verbose在这里，由于OCR和voting disk在ASM中，并且使用了ASMLIB，最常见的错误是：
ERROR:
PRVF-5449 : Check of Voting Disk location "ORCL:DISK6(ORCL:DISK6)" failed on the following nodes:
node2:No such file or directory
PRVF-5431 : Oracle Cluster Voting Disk configuration check failed在下面步骤中将解释这个错误的影响。
5. 在尚存节点上执行grid home下的"addNode.sh" .
[oracle@node1] /grid/oui/bin% ./addNode.sh -silent "CLUSTER_NEW_NODES={node2}" "CLUSTER_NEW_VIRTUAL_HOSTNAMES={node2-v}"
[oracle@node1] /grid/oui/bin%
在这里，上述命令没有任何信息就退出，实际上addNode.sh根本没运行。原因 : ASMLIB在使用中,符合MOS Note : 1267569.1描述的问题第四步的报错能帮我们发现它。解决办法 :
设置如下环境变量并重新运行addNode.sh。
IGNORE_PREADDNODE_CHECKS=Y
export IGNORE_PREADDNODE_CHECKS
[oracle@node1] /grid/oui/bin% ./addNode.sh -silent "CLUSTER_NEW_NODES={node2}" "CLUSTER_NEW_VIRTUAL_HOSTNAMES={node2-v}"Starting Oracle Universal Installer...
Checking swap space: must be greater than 500 MB. Actual 12143 MB
Performing tests to see whether nodes node2 are available
............................................................... 100% Done.Cluster Node Addition Summary
Global Settings
Source: /grid
New NodesSpace Requirements
New Nodes
node2Instantiating scripts for add node (Tuesday, December 21, 2015 3:35:16 AM PST). 1% Done.
Instantiation of add node scripts complete
Copying to remote nodes (Tuesday, December 21, 2015 3:35:18 AM PST)
............................................................................................... 96% Done.
Home copied to new nodes
Saving inventory on nodes (Tuesday, December 21, 2015 3:37:57 AM PST)
. 100% Done.
Save inventory completeWARNING:
The following configuration scripts need to be executed as the "root" user in each cluster node.
/grid/root.sh # On nodes node2To execute the configuration scripts: 1. Open a terminal window 2. Log in as "root" 3. Run the scripts in each cluster nodeThe Cluster Node Addition of /grid was successful.
Please check '/tmp/silentInstall.log' for more details.6. 在重装节点上执行root.sh来启动CRS stack.
这会结束该节点上GI的安装。7. 在尚存节点上执行DB home下的addNode.sh
/home/oracle/app/oracle/product/11.2.0/dbhome_1/addNode.sh -silent "CLUSTER_NEW_NODES={node2}"8. 当DB Home添加完成，使用srvctl检查DB和实例的注册情况，如需要则添加他们。
