rpm包的要求，hangcheck的配置，oracle用户身份对等性连接，hosts配置和裸设备配置全部与10g相同，这里就不复述了。

主要区别一个是voting disk和ocr的大小，11g中要求均大于256m，如果不到大小则安装cluster时会提示。另外在安装cluster时，第一个节点执行root.sh没有问题，而第二个节点报出:

Adding daemons to inittab
Waiting for the Oracle CRSD and EVMD to start
Waiting for the Oracle CRSD and EVMD to start
Waiting for the Oracle CRSD and EVMD to start
Waiting for the Oracle CRSD and EVMD to start
Waiting for the Oracle CRSD and EVMD to start
Waiting for the Oracle CRSD and EVMD to start
Waiting for the Oracle CRSD and EVMD to start
Waiting for the Oracle CRSD and EVMD to start
Waiting for the Oracle CRSD and EVMD to start
Waiting for the Oracle CRSD and EVMD to start
Waiting for the Oracle CRSD and EVMD to start
Waiting for the Oracle CRSD and EVMD to start
Waiting for the Oracle CRSD and EVMD to start
Waiting for the Oracle CRSD and EVMD to start
Waiting for the Oracle CRSD and EVMD to start
Waiting for the Oracle CRSD and EVMD to start

最后超时退出，crsd.log也会循环报错：

CSS is not ready. Received status 3 from CSS. Waiting for good status

后来发现是因为voting disk和ocr没有清除干净，oracle给的是：

dd if=/dev/zero of=/dev/raw/raw1 bs=8192 count=12800

而我偷懒使用了：

dd if=/dev/zero of=/dev/raw/raw1 bs=8192 count=128

导致第一次安装失败- -

重新来过就ok了

新增加了osasm的operating system group，直接把oracle加到这个组就可以以SYSASM的权限来管理ASM实例了