磁带驱动器是一种用于读写磁带的工具。磁带驱动器（tape drive）是存储计算机中的数据到磁带上的设备，其主要目的是数据备份和归档。
4mm库——在手动磁带库中定义4 MM磁带驱动器。
4mm library - Define the 4mm tape drive in a manual tape library.
这种方法很容易实现，并且只需要服务器上安装磁带驱动器即可。
It was easy to do, as long as the server had a tape drive in it.
在创建mksysb镜像之前，您需要为希望备份的LPAR分配磁带驱动器。
Before creating the mksysb image, you need to allocate the tape drive to the LPAR you want to back up.
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