检查系统空间查看系统是否有充足的空间：
df

创建归档目标目录：
mkdir /arch1 /arch2

检查oracle 安装用户并改变归档目录所有权：
chown oracle:oinstall /arch1 /arch2

开启nfs服务：
touch /etc/exports
mknfs –N
mkfs –l
lssrc –g nfs

导出nfs共享
smit mknfsexp
exportfs –a
showmount  –e localhost

添加nfs的预定义挂载
smit mknfsmnt
#vi /etc/filesystems
应该对应为
/arch2:
　　dev = /arch2
　　vfs = nfs
　　log = /tmp/nfslog
	   node=racnode2
　　mount = true
　　options = rw,soft,bg
　　account = false

测试挂载nfs
mount /arch1或mount /arch2

做冷备：
两个节点
shutdown immediate
一个节点startup mount exclusive
ORACLE_SID=racdb1 rman target /
configure backup optimization on;
configure controlfile autobackup on;
backup as copy database;

然后打开两个数据库
在两个系统上做
alter system set log_archive_dest_1='LOCATION=/arch1' scope=spfile sid='racdb1'; alter system set log_archive_dest_1='LOCATION=/arch2' scope=spfile sid='racdb2';
切换rac archivelog
alter system set cluster_database=false scope=spfile sid='*'; shutdown immediate startup mount  exclusive
archive log listalter database  archivelog;
archive log listalter system set cluster_database=true scope=spfile sid='*';
shutdown immediate
startup



alter system switch logfile;几次做验证，结束