linux系统中删除逻辑卷

在生产环境中想要重新部署LVM或者不再需要使用LVM时，则需要执行LVM的删除操作。为此，需要提前备份好重要的数据，

然后依次删除逻辑卷、卷组、物理劵设备，顺序不可颠倒。

1、查看物理劵、卷组、逻辑卷

[root@linuxprobe dev]# pvdisplay | head -n 3
  --- Physical volume ---
  PV Name               /dev/sdb
  VG Name               vgtest1
[root@linuxprobe dev]# vgdisplay | head -n 3
  --- Volume group ---
  VG Name               vgtest1
  System ID
[root@linuxprobe dev]# lvdisplay | head -n 3
  --- Logical volume ---
  LV Path                /dev/vgtest1/lvtest1
  LV Name                lvtest1

2、卸载逻辑卷的挂载

[root@linuxprobe dev]# 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   80K  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/vgtest1-lvtest1   93M  1.6M   85M   2% /linuxprobe
[root@linuxprobe dev]# umount /linuxprobe/  ## 卸载
[root@linuxprobe dev]# 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   80K  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

3、删除逻辑卷

[root@linuxprobe dev]# lvremove /dev/vgtest1/lvtest1
Do you really want to remove active logical volume lvtest1? [y/n]: y
  Logical volume "lvtest1" successfully removed

4、删除卷组（不需要绝对路径）

[root@linuxprobe dev]# vgremove vgtest1
  Volume group "vgtest1" successfully removed

5、删除物理劵

[root@linuxprobe dev]# pvremove /dev/sdb /dev/sdc
  Labels on physical volume "/dev/sdb" successfully wiped
  Labels on physical volume "/dev/sdc" successfully wiped

6、查看物理劵、卷组、逻辑卷

[root@linuxprobe dev]# pvdisplay | head -n 3  ## 默认的？？？
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               rhel
[root@linuxprobe dev]# vgdisplay  | head -n 3
  --- Volume group ---
  VG Name               rhel
  System ID
[root@linuxprobe dev]# lvdisplay  | head -n 3
  --- Logical volume ---
  LV Path                /dev/rhel/swap
  LV Name                swap