lvm操作

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

/dev/卷组名/逻辑卷名
[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
[html] view plain copy

[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！