该错误出现在Linux中安装BE的过程中的，具体错误详情如下：

[root@xxx 2016-9-2]# ./installralus

                                 Symantec Backup Exec Agent for Linux 14.2.1180-1162                                 

Enter the system names separated by spaces on which to install RALUS: (xxx)

Checking system communication:

    Attempting /usr/bin/rsh with xxx .................................... Cannot /usr/bin/rsh to xxx
Initial system check failed.

Press [Return] to continue: 

                                 Symantec Backup Exec Agent for Linux 14.2.1180-1162                                 

The installralus log is saved at:

    /var/tmp/vxif/installralus903065856/installralus.log

[root@xxx 2016-9-2]#

该错误，其实与rsh没有关系。

真正的原因：

[root@xxx 2016-9-2]# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
[root@xxx 2016-9-2]#

如上，需要添加本机主机名的记录：
xxx.xxx.xxx.xxx host_name

————————————————
Done。