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总结了 LVM（逻辑卷管理器）的基本概念、术语（PV, VG, LV, PE）以及在 Linux 中使用相关命令（pvcreate, vgcreate, lvcreate, lvextend, lvreduce, lvcreate -s）进行创建、扩展、缩减和快照操作的方法。
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