在您试图将jdk或sdk的副本从备份安装到缺省位置上的另一个目录中时，需要格外小心。
You need to be careful if you try to install a copy of the JDK or SDK from a backup into a directory different from the default location.
管理节点安装主节点和备份节点，并根据需要进行软件更新。
The management node installs both the master and backup nodes and provides software updates as required.
它的最初形式是DOS实用程序，可以从单个备份映象提供多个安装。
In its original form, it was a DOS utility that provided multiple installations from a single backup image.
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