装配 Oracle 11gR2 RAC grid执行到网络配置助手时报错

安装 Oracle 11gR2 RAC grid执行到网络配置助手时报错
大家好：
我的系统环境是 RHEL5 Linux 64位，在安装64位 Oracle 11gR2 RAC 的Grid 过程中，在执行网络配置助手 Oracle Net Configuration Assistant，这一步报错了（如最下面的附图），
我检查 /u01/app/oraInventory/logs/installActions2013-09-01_04-01-22PM.log 安装日志，部分报错如下：
INFO: Problem in configuration: PRCN-2061 : Failed to add listener ora.LISTENER.lsnr
INFO: PRCN-2065 : Port(s) 1521 are not available on the nodes given
INFO: PRCN-2035 : Port 1521 is not available on node(s) or virtual host(s): rac1-vip
INFO: Oracle Net Listener Startup:
INFO: Listener does not exists.
INFO: Check the trace file for details: /u01/app/oracle/cfgtoollogs/netca/trace_Ora11g_gridinfrahome1-1309014PM5342.log
INFO: Oracle Net Services configuration failed. The exit code is 1
INFO:
WARNING:
INFO: Completed Plugin named: Oracle Net Configuration Assistant
INFO: Oracle Net Configuration Assistant failed.
INFO: Oracle Net Configuration Assistant failed.

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/u01/app/oracle/cfgtoollogs/netca/trace_Ora11g_gridinfrahome1-1309014PM5342.log 的部分报错日志如下：

[main] [ 2013-09-01 16:53:59.530 CST ] [NativeSystem.rununixcmd:1058] NativeSystem.rununixcmd: RetString 0|scp: /u01/11.2.0/grid/network/admin/sqlnet.ora: No such file or directory :failed
[main] [ 2013-09-01 16:53:59.530 CST ] [CopyCommand.execute:79] CopyCommand.execute: native copyFile returns `0|scp: /u01/11.2.0/grid/network/admin/sqlnet.ora: No such file or directory :failed'
[main] [ 2013-09-01 16:53:59.530 CST ] [NativeResult.<init>:91] NativeResult: The String obtained is0|scp: /u01/11.2.0/grid/network/admin/sqlnet.ora: No such file or directory :failed

[main] [ 2013-09-01 16:53:59.531 CST ] [NativeResult.<init>:112] The result string is: scp: /u01/11.2.0/grid/network/admin/sqlnet.ora: No such file or directory :failed 1
[main] [ 2013-09-01 16:53:59.531 CST ] [ClusterException.setErrorMessage:131] ClusterException.setErrorMessage: commands[0]=oracle.ops.mgmt.command.file.CopyCommand@3794d372
[main] [ 2013-09-01 16:53:59.531 CST ] [ClusterException.setErrorMessage:151] ClusterException.setErrorMessage: errString is 'scp: /u01/11.2.0/grid/network/admin/sqlnet.ora: No such file or directory :failed'

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我系统的一些配置，如下:
一、 /etc/hosts 文件配置：
127.0.0.1 localhost.localdomain localhost
#::1 localhost6.localdomain6 localhost6

# Public IP
192.168.123.100 rac1.localdomain rac1
192.168.123.200 rac2.localdomain rac2

# Virtual IP
192.168.123.101 rac1-vip.localdomain rac1-vip
192.168.123.201 rac2-vip.localdomain rac2-vip

# Private IP
10.0.0.100 rac1-priv.localdomain rac1-priv
10.0.0.200 rac2-priv.localdomain rac2-priv

# SCAN IP
192.168.123.101 rac-scan.localdomain rac-scan
192.168.123.201 rac-scan.localdomain rac-scan
192.168.123.101 rac-scan.localdomain rac-scan

二、grid 用户的环境变量配置：
export TMP=/tmp
export TMPDIR=$TMP
export ORACLE_BASE=/u01/app/oracle
export ORACLE_HOME=$ORACLE_BASE/product/11.2.0/db_1
export ORACLE_SID=+ASM1
export ORACLE_TERM=xterm
export NLS_DATE_FORMAT="yyyy-mm-dd hh24:mi:ss"
export LANG=en_US.UTF-8

export NLS_LANG=AMERICAN_AMERICA.ZHS16GBK
export PATH=/sbin:/usr/sbin:$ORACLE_HOME/bin:$PATH
export THREADS_FLAG=native
export LD_LIBRARY_PATH=$ORACLE_HOME/lib:/lib:/usr/lib
export CLASSPATH=$ORACLE_HOME/JRE:$ORACLE_HOME/jlib:$ORACLE_HOME/rdbms/jlib

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请问以下几个问题：
1、在下面附图中，在 grid 用户中安装 grid组件到网络配置助手时报错，是什么原因导致的呢？应怎么处理？
2、请问安装 Oracle 11gR2 RAC ，一定要配置dns服务和正确配置 scan ip吗？像我上面那样在 /etc/hosts 配置的三个 rac-scan ip是指向 rac1-vip 和 rac2-vip的ip，这样有问题吗？
3、我上面的 /etc/hosts 文件配置和 grid 用户的环境变量配置有问题吗？
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待复，万分感谢！

装配 Oracle 11gR2 RAC grid执行到网络配置助手时报错 11g rac
[解决办法]
网上应该有的。。

装配 Oracle 11gR2 RAC grid执行到网

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