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lvreduce
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===
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收缩逻辑卷空间
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## 补充说明
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**lvreduce命令** 用于减少LVM逻辑卷占用的空间大小。使用lvreduce命令收缩逻辑卷的空间大小有可能会删除逻辑卷上已有的数据，所以在操作前必须进行确认。
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### 语法
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```
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lvreduce(选项)(参数)
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```
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### 选项
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```
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-L：指定逻辑卷的大小，单位为“kKmMgGtT”字节；
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-l：指定逻辑卷的大小（LE数）。
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```
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### 参数
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逻辑卷：指定要操作的逻辑卷对应的设备文件。
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### 实例
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使用lvreduce命令减少指定的逻辑卷的空间大小。在命令行中输入下面的命令：
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```
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[root@localhost ~]# lvreduce -L -50M /dev/vg1000/lvol0 #将逻辑卷的空间大小减少50M
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```
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输出信息如下：
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```
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......省略部分输出内容......
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Do you really want to reduce lvol0? [y/n]: y #确认操作
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Reducing logical volume lvol0 to 252.00 MB
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Logical volume lvol0 successfully resized
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```
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<!-- Linux命令行搜索引擎：https://jaywcjlove.github.io/linux-command/ -->
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