在Linux系统中，删除lv、vg、pv

查看卷组相关信息

 [root@localhost /]# vgscan
   Reading all physical volumes.  This may take a while...
   Found volume group "VolGroup00" using metadata type lvm2

查看卷组VolGroup00包含的PV、LV信息。

 [root@localhost /]# vgdisplay -v VolGroup00
     Using volume group(s) on command line
     Finding volume group "VolGroup00"
   --- Volume group ---
   VG Name               VolGroup00
   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               0
   Max PV                0
   Cur PV                1
   Act PV                1
   VG Size               1.01 GiB
   PE Size               8.00 MiB
   Total PE              129
   Alloc PE / Size       100 / 800.00 MiB
   Free  PE / Size       29 / 232.00 MiB
   VG UUID               Cug510-pQb6-RELO-lb1K-zjbt-3f62-jQLoQp

   --- Logical volume ---
   LV Path                /dev/VolGroup00/iscsi00
   LV Name                iscsi00
   VG Name                VolGroup00
   LV UUID                tE78D6-5kJf-0HOh-4jRX-oLhI-ehyR-XhMmMQ
   LV Write Access        read/write
   LV Creation host, time localhost.iscsi, 2017-01-19 14:25:40 +0800
   LV Status              available
   # open                 0
   LV Size                800.00 MiB
   Current LE             100
   Segments               1
   Allocation             inherit
   Read ahead sectors     auto
   - currently set to     256
   Block device           253:0

   --- Physical volumes ---
   PV Name               /dev/sda7
   PV UUID               OWz0uw-gTR1-WylF-z6HW-cgpe-LLd9-2W8Q9g
   PV Status             allocatable
   To编辑/etc/fstab，删除对应挂载信息tal PE / Free PE    129 / 29

卸载卷组上的逻辑卷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VolGroup00只有/dev/VolGroup00/iscsi00这个逻辑卷LV

 [root@localhost /]# umount /dev/VolGroup00/iscsi00

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（#df -Th 查看）。

删除逻辑卷LV

 [root@localhost /]# lvremove /dev/VolGroup00/iscsi00
 Do you really want to remove active logical volume iscsi00? [y/n]: y
   Logical volume "iscsi00" successfully removed
 [root@localhost /]#

如果删除提示出错，那么检查下当前使用该逻辑卷的进程，然后结束该进程或者服务即可。

验证LV是否删除

 [root@localhost /]# lvdisplay | grep "dev/VolGroup00/iscsi00"

删除卷组VG

 [root@localhost /]# vgremove VolGroup00
   Volume group "VolGroup00" successfully removed
 [root@localhost /]#

如果采用安全的方式删除卷组VG，则必须使用 vgchange -a n VolGroup00 将其关闭，然后再删除它。

 [root@localhost /]# vgchange -a n VolGroup00
   0 logical volume(s) in volume group "VolGroup00" now active
 [root@localhost /]# vgremove VolGroup00
   Volume group "VolGroup00" successfully removed
 [root@localhost /]#

验证卷组（VG）是否删除

 [root@localhost /]# vgscan
   Reading all physical volumes.  This may take a while...
   No volume groups found
 [root@localhost /]#

删除物理卷PV

 [root@localhost /]# pvremove /dev/sda7
   Labels on physical volume "/dev/sda7" successfully wiped
 [root@localhost /]# pvscan
   No matching physical volumes found
 [root@localhost /]#

编辑 /etc/fstab 删除对应挂载点信息

如果没有设置挂载点，可以忽略这一步，否则重启系统就会出现问题，切记！