交换文件系统比从磁带恢复快，而且还可以保留升级失败的文件系统供进一步诊断。
Swapping the filesystems over is quicker than restoring from tape, and you also have a copy of the failed upgraded filesystem for further diagnostics.
在存储了磁带数据存储盒的自动化数据存储库中提供了诊断信息。
Diagnostic information is provided in an automated data storage library which stores magnetic tape data storage cartridges.
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