在Linux系统中，如何删除一个卷组（VG）呢？ 下面我总结了一下如何删除卷组（VG）的具体步骤，仅供参考，如有不足，敬请指出。谢谢！在下面的例子中，我想删除卷组VolGroup05。
步骤1： 查看卷组（VG）相关信息，如下所示
[root@getlnx01uat ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
97G 36G 57G 39% /
/dev/mapper/VolGroup01-LogVol00
79G 33G 43G 44% /u01
/dev/mapper/VolGroup02-LogVol00
197G 182G 5.4G 98% /u02
/dev/mapper/VolGroup03-LogVol00
197G 57G 130G 31% /u03
/dev/mapper/VolGroup04-LogVol00
138G 118G 14G 90% /u04
/dev/mapper/VolGroup05-LogVol00
178G 48G 121G 29% /u05
/dev/sda1 99M 23M 71M 25% /boot
tmpfs 2.0G 0 2.0G 0% /dev/shm
[root@getlnx01uat ~]# vgscan
Reading all physical volumes. This may take a while...
Found volume group "VolGroup05" using metadata type lvm2
Found volume group "VolGroup04" using metadata type lvm2
Found volume group "VolGroup03" using metadata type lvm2
Found volume group "VolGroup02" using metadata type lvm2
Found volume group "VolGroup01" using metadata type lvm2
Found volume group "VolGroup00" using metadata type lvm2
[root@getlnx01uat ~]#
查看卷组VolGroup05包含的PV、LV信息。如下所示
[root@getlnx01uat ~]# vgdisplay -v VolGroup05
Using volume group(s) on command line
Finding volume group "VolGroup05"
--- Volume group ---
VG Name VolGroup05
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 2
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 1
Act PV 1
VG Size 179.97 GB
PE Size 32.00 MB
Total PE 5759
Alloc PE / Size 5759 / 179.97 GB
Free PE / Size 0 / 0
VG UUID UNFxZH-lAGM-vqF3-jtNK-yuKT-enUX-WwL7FQ
--- Logical volume ---
LV Name /dev/VolGroup05/LogVol00
VG Name VolGroup05
LV UUID kCTJnc-D3zQ-QiJp-TfPh-ivWs-WKyW-VvGTod
LV Write Access read/write
LV Status available
# open 1
LV Size 179.97 GB
Current LE 5759
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2
--- Physical volumes ---
PV Name /dev/sdg5
PV UUID VbSwjS-9ckQ-ZfWf-bl8g-oPWQ-TMBi-H6oMWv
PV Status allocatable
Total PE / Free PE 5759 / 0
2：卸载卷组的逻辑卷LV
要卸载对应卷组VG的所有逻辑卷LV。从上面的信息可以看出对应的卷组VolGroup05只有/dev/VolGroup05/LogVol00这个逻辑卷LV
[root@getlnx01uat ~]# umount /dev/VolGroup05/LogVol00
使用下面命令亦可
[root@getlnx01uat ~]# umount /u05
如果还用进程在使用对应逻辑卷的文件，就必须强制卸载挂接点。
3：删除逻辑卷LV
[root@getlnx01uat ~]# lvremove /dev/VolGroup05/LogVol00
Do you really want to remove active logical volume LogVol00? [y/n]: y
Logical volume "LogVol00" successfully removed
[root@getlnx01uat ~]#
验证LV是否删除
[root@getlnx01uat ~]# lvdisplay | grep “dev/VolGroup05/LogVol00”
4：删除卷组VG
[root@getlnx01uat ~]# vgremove VolGroup05
Volume group "VolGroup05" successfully removed
[root@getlnx01uat ~]#
如果采用安全的方式删除卷组VG，则必须使用vgchange -a n VolGroup05关闭了vg_name，然后才可以删除它。
[root@getlnx01uat ~]# vgchange -a n VolGroup05
0 logical volume(s) in volume group "VolGroup05" now active
[root@getlnx01uat ~]# vgremove VolGroup05
Volume group "VolGroup05" successfully removed
验证卷组（VG）是否删除
[root@getlnx01uat ~]# vgscan
Reading all physical volumes. This may take a while...
Found volume group "VolGroup04" using metadata type lvm2
Found volume group "VolGroup03" using metadata type lvm2
Found volume group "VolGroup02" using metadata type lvm2
Found volume group "VolGroup01" using metadata type lvm2
Found volume group "VolGroup00" using metadata type lvm2
[root@getlnx01uat ~]#
5：删除物理卷PV
[root@getlnx01uat ~]# pvremove /dev/sdg5
Labels on physical volume "/dev/sdg5" successfully wiped
[root@getlnx01uat ~]# pvscan
PV /dev/sde5 VG VolGroup04 lvm2 [139.97 GB / 0 free]
PV /dev/sdd5 VG VolGroup03 lvm2 [199.97 GB / 0 free]
PV /dev/sdc5 VG VolGroup02 lvm2 [199.97 GB / 0 free]
PV /dev/sdb5 VG VolGroup01 lvm2 [79.97 GB / 0 free]
PV /dev/sda2 VG VolGroup00 lvm2 [51.88 GB / 0 free]
PV /dev/sdf5 VG VolGroup00 lvm2 [59.97 GB / 0 free]
Total: 6 [731.72 GB] / in use: 6 [731.72 GB] / in no VG: 0 [0 ]
6：编辑/etc/fstab，删除对应挂载信息
如果这一步不处理，则系统重启过程中会遇到如下错误信息：
在修复模式下（Repair filesystem），文件是被保护的，不能被修改 。编辑vi /etc/fstab后并不能保存。
可以运行下面命令，把系统文件权限修改为可读写（rw）,然后编辑/etc/fstab,删除挂载点信息，重启服务器即可解决问题。
mount -o remount, rw /
参考资料：
