Linux lvreduce命令|极客笔记

Linux lvreduce命令：减小逻辑卷大小。

Linux lvreduce命令功能描述

使用lvreduce命令可以减少逻辑卷的大小。当减小逻辑卷的大小时要特别小心，因为减少了的部分数据会丢失。

Linux lvreduce命令语法

lvreduce [选项] [逻辑卷名称|逻辑卷路径]

命令中各选项的含义如表所示。

lvreduce命令选项含义

Linux lvreduce命令示例

减少卷组vg1中的逻辑卷lv1的大小，减少3个逻辑盘区

[root@rhel ～]# lvreduce -l -3 vg1/lv1
  WARNING: Reducing active logical volume to 99.99 GiB
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce lv1? [y/n]: y                      //输入y确认减小逻辑卷的大小
  Reducing logical volume lv1 to 99.99 GiB
  Logical volume lv1 successfully resized

将逻辑卷lv1的大小减少到140GB

[root@rhel ～]# lvreduce -L 140G /dev/vg1/lv1
  WARNING: Reducing active logical volume to 140.00 GiB
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce lv1? [y/n]: y                      //输入y确认减小逻辑卷的大小
  Reducing logical volume lv1 to 140.00 GiB
  Logical volume lv1 successfully resized

将逻辑卷lv1的大小减少10GB

[root@rhel ～]# lvreduce -L -10G /dev/vg1/lv1
  WARNING: Reducing active logical volume to 130.00 GiB
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce lv1? [y/n]: y                      //输入y确认减小逻辑卷的大小
  Reducing logical volume lv1 to 130.00 GiB
  Logical volume lv1 successfully resized