私有网络是RAC节点间通信的通道，包括节点间的网络心跳信息、Cache fusion传递数据块都需要通过私有网络。而很多的私有网络都仅仅
在RAC的安装部署过程中，并不仅仅是简单的安装完成了事，整个安装过程要考虑可能出现的单点问题，其中比较重要的是私有网络。
私有网络是RAC节点间通信的通道，包括节点间的网络心跳信息、Cache fusion传递数据块都需要通过私有网络。而很多的私有网络都仅仅是一块单独的网卡连接上交换机就完成了，更有甚者，直接使用服务器间网卡互连的方式配置私有网络。这种部署方式简单，但RAC投入使用后风险非常大，存在诸多单点如网卡、网线、交换机口、交换机。几乎每个组件发生故障都会导致RAC split，，所以建议为私有网络配置双网卡bonding。
Linux双网卡绑定实现负载均衡(Bonding双网卡绑定)
Linux Bonding的初始状态问题以及解决
多网卡绑定Bonding生产实战
多网卡负载均衡（双网卡做Bonding模式）
在CentOS 6.4下安装Oracle 11gR2(x64)
Oracle 11gR2 在VMWare虚拟机中安装步骤
Debian 下 安装 Oracle 11g XE R2
下面是我的配置步骤：
环境：
OS：CentOS release 6.4 (Final)
Oracle：11.2.0.4 RAC
网卡：4个 em1,em2,em3,em4，当前em1作为公有网卡，em3作为私有网卡已经启用了，em2和em4闲置。
配置bond模块并加载（在2个节点执行）：
编辑/etc/modprobe.d/bonding.conf加入内容：
[root@node2 ~]# vi /etc/modprobe.d/bonding.conf
alias bond0 bonding
[root@node2 ~]# modprobe -a bond0
验证：
[root@node2 ~]# lsmod |grep bond
bonding 127331 0
8021q 25317 1 bonding
ipv6 321422 274 bonding,ip6t_REJECT,nf_conntrack_ipv6,nf_defrag_ipv6
编辑网卡配置文件，编辑成如下内容：
节点一：
Ifcfg-em2:
DEVICE=em2
BOOTPROTO=none
ONBOOT=yes
MASTER=bond0
SLAVE=yes
Ifcfg-em4:
DEVICE=em4
BOOTPROTO=none
ONBOOT=yes
MASTER=bond0
SLAVE=yes
Ifcfg-bond0:
DEVICE=bond0
MASTER=yes
BOOTPROTO=node
ONBOOT=yes
BONDING_OPTS="mode=1 miimon=100"
IPADDR=10.10.10.105
PREFIX=24
GATEWAY=10.10.10.1
节点二：
ifcfg-em2:
DEVICE=em2
BOOTPROTO=none
ONBOOT=yes
MASTER=bond0
SLAVE=yes
ifcfg-em4:
DEVICE=em4
BOOTPROTO=none
ONBOOT=yes
MASTER=bond0
SLAVE=yes
Ifcfg-bond0:
DEVICE=bond0
MASTER=yes
BOOTPROTO=node
ONBOOT=yes
BONDING_OPTS="mode=1 miimon=100"
IPADDR=10.10.10.106
PREFIX=24
GATEWAY=10.10.10.1
我这里使用的是mode=1的主备网卡模式，平时只激活一块网卡，一旦主网卡发生故障，会切换链路到备网卡，其他也可以考虑4,6两种mode。
修改完了配置文件之后，分别在2个节点启动bond0：ifup bond0。
此时可以看到：
[root@node1 ~]# ifconfig
bond0 Link encap:Ethernet HWaddr C8:1F:66:FB:6F:CB
inet addr:10.10.10.105 Bcast:10.10.10.255 Mask:255.255.255.0
inet6 addr: fe80::ca1f:66ff:fefb:6fcb/64 Scope:Link
UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1
RX packets:9844809 errors:0 dropped:0 overruns:0 frame:0
TX packets:7731078 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:9097132073 (8.4 GiB) TX bytes:6133004979 (5.7 GiB)
em2 Link encap:Ethernet HWaddr C8:1F:66:FB:6F:CB
UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1
RX packets:9792915 errors:0 dropped:0 overruns:0 frame:0
TX packets:7731078 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:9088278883 (8.4 GiB) TX bytes:6133004979 (5.7 GiB)
Interrupt:38
em4 Link encap:Ethernet HWaddr C8:1F:66:FB:6F:CB
UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1
RX packets:51894 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:8853190 (8.4 MiB) TX bytes:0 (0.0 b)
Interrupt:36
网卡的bonding已经配置成功了。
测试验证
此时可以测试分别断掉em2 em4，在一个节点长ping另一个节点的私有IP，并结合/proc/net/bonding/bond0的信息观察primary slave的变化，可以发现当down一个网卡时ping不会中断。
Bond0配置好之后，接下来一步就是把配置成RAC的私有网卡。
为了避免配置失败，首先要备份好原来的配置文件。
以grid用户在2个节点对$GRID_HOME/ grid/gpnp/noden/profiles/peer/profile.xml文件执行备份：
cd /u01/app/11.2.0/grid/gpnp/noden/profiles/peer
cp profile.xml profile.xml.bk
[root@node2 peer]# ls
pending.xml profile_orig.xml profile.xml profile.xml.bk、
查看目前的私有网络配置：
node2-> oifcfg getif
em1 192.168.10.0 global public
em3 10.10.10.0 global cluster_interconnect
先添加新的私有网络，在任一节点执行即可：
node1-> oifcfg setif -global bond0/10.10.10.0:cluster_interconnect
这一步在执行时可能会报错：
node1-> oifcfg setif -global bond0/10.10.10.0:cluster_interconnect
PRIF-33: Failed to set or delete interface because hosts could not be discovered
CRS-02307: No GPnP services on requested remote hosts.
PRIF-32: Error in checking for profile availability for host node2
CRS-02306: GPnP service on host "node2" not found.
这是因为gpnpd服务异常导致的。
解决方法：可以Kill掉gpnpd进程，GI会自动重新启动gpnpd服务。
在2个节点执行：
[root@node2 ~]# ps -ef| grep gpnp
grid 4927 1 0 Sep22 ? 00:26:38 /u01/app/11.2.0/grid/bin/gpnpd.bin
grid 48568 46762 0 17:26 pts/3 00:00:00 tail -f /u01/app/11.2.0/grid/log/node2/gpnpd/gpnpd.log
root 48648 48623 0 17:26 pts/4 00:00:00 grep gpnp
[root@node2 ~]# kill -9 4927
[root@node2 ~]#
参考gpnpd.log
添加私有网络之后，我们按照如下步骤将原来的私有网络删除：
首先停止并disable掉crs。
以root用户在2个节点分别执行以下命令：
停止crs
crsctl stop crs
禁用crs
crsctl disable crs
修改hosts文件，将私有IP地址改为新地址。
2个节点分别执行：
ping node1-priv
ping node2-priv
再启动crs。
[root@node2 ~]# crsctl enable crs
CRS-4622: Oracle High Availability Services autostart is enabled.
[root@node2 ~]# crsctl start crs
删除原来的私有网络：
node2-> oifcfg delif -global em3/10.10.10.0:cluster_interconnect
检查验证，配置成功了。
node2-> oifcfg getif
em1 192.168.10.0 global public
bond0 10.10.10.0 global cluster_interconnect
node2->
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