修改IP及VIP大概可分为7个步骤，根据metalink上的指导，步骤如下：

10g RAC 双节点 环境 OS:Windows2003 Server，用户需要变更public IP，则VIP也要相应的改变
原IP (OS host 文件)

127.0.0.1 localhost
127.0.0.1 IRRDBSVR1
10.41.162.93 IRRDBSVR1
10.41.162.94 IRRDBSVR2
10.10.10.1 IRRDBSVR1-PRIV
10.10.10.2 IRRDBSVR2-PRIV
10.41.162.95 IRRDBSVR1-VIP
10.41.162.96 IRRDBSVR2-VIP

变更后的新IP
127.0.0.1 localhost
127.0.0.1 IRRDBSVR1
192.168.1.245 IRRDBSVR1
192.168.1.247 IRRDBSVR2
10.10.10.1 IRRDBSVR1-PRIV
10.10.10.2 IRRDBSVR2-PRIV
192.168.1.246 IRRDBSVR1-VIP
192.168.1.248 IRRDBSVR2-VIP

按照matalink 上的要求

1. Stop all resources that are dependent on the VIP on a given node.
srvctl stop database -d racdb

2 Confirm the current IP address for the VIP by running the command 'ipconfig /all'
得到所有的网络接口，这里可以看到包括原VIP在内的3个IP地址(这里没有复制输出，但结果如下面所示)
10.41.162.93 IRRDBSVR1
10.41.162.95 IRRDBSVR1-VIP
10.10.10.1 IRRDBSVR1-PRIV

3. Stop the nodeapps using srvctl commands:
srvctl stop nodeapps -n IRRDBSVR1
(没有报错)

4 Verify that the VIP is no longer running by executing the 'ipconfig /all' command again，验证VIP被成功停用
10.41.162.93 IRRDBSVR1
10.10.10.1 IRRDBSVR1-PRIV

5 Make any changes necessary to all nodes' /etc/hosts files (on Unix), or the WINNTSystem32driversetchosts file (on Windows) and/or make the necessary DNS changes, to associate the new IP address with the old host name.
已经配置hosts文件了

6 Modify the nodeapps and provide the new virtual IP address.
srvctl modify nodeapps -n IRRDBSVR1 -A 192.169.1.245/255.255.255.0/public
(没有报错)

7 Start node-level applications
C:>srvctl start nodeapps -n IRRDBSVR1

第一次配置失败，在执行第7个步骤时报错

CRS-1006: 不再考虑其他成员
CRS-0215: 无法启动资源 'ora.irrdbsvr1.vip'。
CRS-0215: 无法启动资源 'ora.irrdbsvr1.LISTENER_IRRDBSVR1.lsnr'。

后来查找原因，原来是在步骤6的srvctl modify命令结尾没有将新的VIP与网络接口帮定，后添加public，问题解决！

由于IP的修改，导致enterprise manager可能无法运行。通过EMCA重新配置：

emca -reconfig dbcontrol -cluster

===================================================

[@more@]