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add disk usage description
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file_system.txt

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TBW(Total Bytes Writen)
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TBW = Total Capacity * 擦写次数/写放大率
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175、查看磁盘空间时,需要明确文件系统有预留空间,inode table 也会占用空间
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需要使用 tune2fs -l /dev/sda 查看下 super block的信息,确认空间占用

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