linux系统中完整删除逻辑卷、卷组、物理劵

• 删除逻辑卷前备份数据
• 逻辑卷删除顺序为逻辑卷、卷组、物理劵，不可颠倒

1、查看系统中当前的逻辑卷

[root@PC1linuxprobe /]# lvscan 
  ACTIVE            '/dev/rhel/swap' [2.00 GiB] inherit
  ACTIVE            '/dev/rhel/root' [17.51 GiB] inherit
  ACTIVE            '/dev/vg1/lv1' [100.00 MiB] inherit
  ACTIVE            '/dev/vg1/lv2' [300.00 MiB] inherit

2、查看逻辑卷挂载情况

[root@PC1linuxprobe /]# df -h
Filesystem             Size  Used Avail Use% Mounted on
/dev/mapper/rhel-root   18G  2.9G   15G  17% /
devtmpfs               985M     0  985M   0% /dev
tmpfs                  994M  140K  994M   1% /dev/shm
tmpfs                  994M  8.8M  986M   1% /run
tmpfs                  994M     0  994M   0% /sys/fs/cgroup
/dev/sda1              497M  119M  379M  24% /boot
/dev/sr0               3.5G  3.5G     0 100% /run/media/root/RHEL-7.0 Server.x86_64
/dev/mapper/vg1-lv2    283M  2.1M  262M   1% /lvmounttest

3、卸载逻辑卷

[root@PC1linuxprobe /]# umount /lvmounttest

4、删除逻辑卷

[root@PC1linuxprobe /]# lvscan 
  ACTIVE            '/dev/rhel/swap' [2.00 GiB] inherit
  ACTIVE            '/dev/rhel/root' [17.51 GiB] inherit
  ACTIVE            '/dev/vg1/lv1' [100.00 MiB] inherit
  ACTIVE            '/dev/vg1/lv2' [300.00 MiB] inherit
[root@PC1linuxprobe /]# lvremove /dev/vg1/lv1
Do you really want to remove active logical volume lv1? [y/n]: y
  Logical volume "lv1" successfully removed
[root@PC1linuxprobe /]# lvremove /dev/vg1/lv2
Do you really want to remove active logical volume lv2? [y/n]: y
  Logical volume "lv2" successfully removed
[root@PC1linuxprobe /]# lvscan 
  ACTIVE            '/dev/rhel/swap' [2.00 GiB] inherit
  ACTIVE            '/dev/rhel/root' [17.51 GiB] inherit

5、删除卷组

[root@PC1linuxprobe /]# vgscan 
  Reading all physical volumes.  This may take a while...
  Found volume group "rhel" using metadata type lvm2
  Found volume group "vg1" using metadata type lvm2
[root@PC1linuxprobe /]# vgremove vg1 
  Volume group "vg1" successfully removed
[root@PC1linuxprobe /]# vgscan 
  Reading all physical volumes.  This may take a while...
  Found volume group "rhel" using metadata type lvm2

6、删除物理劵

[root@PC1linuxprobe /]# pvscan 
  PV /dev/sda2   VG rhel            lvm2 [19.51 GiB / 0    free]
  PV /dev/sdb                       lvm2 [20.00 GiB]
  PV /dev/sdc                       lvm2 [20.00 GiB]
  PV /dev/sdd                       lvm2 [20.00 GiB]
  Total: 4 [79.51 GiB] / in use: 1 [19.51 GiB] / in no VG: 3 [60.00 GiB]
[root@PC1linuxprobe /]# pvremove /dev/sdb /dev/sdc /dev/sdd
  Labels on physical volume "/dev/sdb" successfully wiped
  Labels on physical volume "/dev/sdc" successfully wiped
  Labels on physical volume "/dev/sdd" successfully wiped
[root@PC1linuxprobe /]# pvscan 
  PV /dev/sda2   VG rhel   lvm2 [19.51 GiB / 0    free]
  Total: 1 [19.51 GiB] / in use: 1 [19.51 GiB] / in no VG: 0 [0   ]

总结，完整删除逻辑卷步骤：

• 卸载，示例：umount /mountpoint
• 删除逻辑卷，示例：lvremove /dev/vgname/lvname
• 删除卷组，示例：vgremove vgname
• 删除物理劵，示例：pvremove /dev/disk*

 注：

• 逻辑卷部署顺序：物理劵→卷组→逻辑卷
• 逻辑卷删除顺序：逻辑卷→卷组→物理劵