dd if=/dev/zero of=/home/swap/swapfile bs=1024 count=16777216
mkswap /home/swap/swapfile
swapon /home/swap/swapfile
编辑/etc/fstab
/home/swap/swapfile swap swap defaults 0 0
2、设置主机名 /etc/hosts，名称不要设置过长，最好<5个字符，否则安装时报计算机名称重复
# vi /etc/hosts
127.0.0.1 localhost
192.168.172.58 rac1 rac1-pub
10.0.0.58 rac1-priv
192.168.172.56 rac1-vip
192.168.172.59 rac2 rac2-pub
10.0.0.59 rac2-priv
192.168.172.117 rac2-vip
192.168.172.55 rac-scan
3、设置IP，检查注意ONBOOT=YES，以便IP能随机启动
#vi /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
TYPE=Ethernet
UUID=3398bf27-74b9-4e77-89e4-da0e33896cfe
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=none
4、几个需要注意的内核参数
kernel.shmmax 设置值必须大于SGA
kernel.shmmni = 8192 在110204版本中，如果设置为4K，在第二台机器执行root.sh时会报内存溢出
net.ipv4.ip_local_port_range = 9000 65000 不能设为1024 65000
fs.file-max = 6815744
fs.aio-max-nr = 1048576
5、多路径配置，udev模式
1）使用multipath
根据下面的显示，找到datalun对应的DM_UUID
[root@rac2 ~]# for i in datalun datalunp1 datalunp2 datalunp3; do printf "%s %s\n" "$i" "$(udevadm info --query=all --name=/dev/mapper/$i |grep -i dm_uuid)"; done
datalun E: DM_UUID=mpath-36001438009b064ce0000500000160000
datalunp1 E: DM_UUID=part1-mpath-36001438009b064ce0000500000160000
datalunp2 E: DM_UUID=part2-mpath-36001438009b064ce0000500000160000
datalunp3 E: DM_UUID=part3-mpath-36001438009b064ce0000500000160000
然后根据下面的显示，确定dm*与datalun的对应关系
for i in datalunp1 datalunp2 datalunp3; do printf "%s %s\n" "$i" "$(ls -ll /dev/mapper/$i)"; done
datalunp1 lrwxrwxrwx. 1 root root 7 Dec 21 21:08 /dev/mapper/datalunp1 -> ../dm-3
datalunp2 lrwxrwxrwx. 1 root root 7 Dec 21 21:08 /dev/mapper/datalunp2 -> ../dm-4
datalunp3 lrwxrwxrwx. 1 root root 7 Dec 21 21:08 /dev/mapper/datalunp3 -> ../dm-5
创建/etc/udev/rules.d/99-oracle-asmdevices.rules文件，定义内容如下：
# vi /etc/udev/rules.d/99-oracle-asmdevices.rules
KERNEL=="dm-3",ENV{DM_UUID}=="part1-mpath-36001438009b064ce0000500000160000",OWNER="grid",GROUP="asmadmin",MODE="0660"
KERNEL=="dm-4",ENV{DM_UUID}=="part2-mpath-36001438009b064ce0000500000160000",OWNER="grid",GROUP="asmadmin",MODE="0660"
KERNEL=="dm-5",ENV{DM_UUID}=="part3-mpath-36001438009b064ce0000500000160000",OWNER="grid",GROUP="asmadmin",MODE="0660"
注意：重启两台机器后，有时出现/dev/mapper/dm*下，dm对应的别名顺序不一致，可以通过拷贝另一台机器/etc/multipath.conf，再重启解决
赋权限
chown grid:asmadmin /dev/dm-*(3-11)
chmod 777 /dev/mapper/datalunp*(1-9)