逻辑卷查看命令

1.查看

检查系统中是否安装了LVM管理工具
[root@test_vonedao_83 /]# rpm -qa|grep lvm
lvm2-libs-2.02.185-2.el7.x86_64
lvm2-2.02.185-2.el7.x86_64

查看物理卷大小
[root@test_vonedao_83 /]# pvscan 
  PV /dev/sda2   VG centos          lvm2 [77.98 GiB / 172.00 MiB free]
  Total: 1 [77.98 GiB] / in use: 1 [77.98 GiB] / in no VG: 0 [0   ]

查看逻辑卷大小
[root@test_vonedao_83 /]# lvscan 
  ACTIVE            '/dev/centos/root' [50.00 GiB] inherit
  ACTIVE            '/dev/centos/home' [20.00 GiB] inherit
  ACTIVE            '/dev/centos/swap' [7.81 GiB] inherit

查看/dev/sda 磁盘大小

[root@test_vonedao_83 /]# fdisk -l /dev/sda

磁盘 /dev/sda：240.1 GB, 240057409536 字节，468862128 个扇区
Units = 扇区 of 1 * 512 = 512 bytes
扇区大小(逻辑/物理)：512 字节 / 512 字节
I/O 大小(最小/最佳)：512 字节 / 512 字节
磁盘标签类型：dos
磁盘标识符：0x000b6965

   设备 Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200   165642239    81771520   8e  Linux LVM

3.删除多余的逻辑卷：lvremove

[root@test_vonedao_83 ~]# lvremove /dev/mapper/centos-opt
Do you really want to remove active logical volume centos/opt? [y/n]: y
  Logical volume "opt" successfully removed

[root@test_vonedao_83 ~]# lsblk 
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 223.6G 0 disk 
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 78G 0 part 
├─centos-root 253:0 0 50G 0 lvm /
├─centos-swap 253:1 0 7.8G 0 lvm [SWAP]
└─centos-home 253:2 0 20G 0 lvm /home
sdb 8:16 0 931.5G 0 disk 
└─sdb1 8:17 0 100G 0 part /opt