lvm中物理卷的删除

1，umount相应分区：umount /xxx/xxx/xx
2，删除相应的逻辑卷（lv）
   可以通过 lvdiplay 命令查看所有逻辑卷信息，然后找到要删除的逻辑卷；
   通过 lvremove 逻辑卷名称 来删除逻辑卷。
3，将要删除的物理卷对应的PV从VG中移除。
   命令是vgreduce vg名称 pv名称
   可以通过vgdisplay -v  查看信息。
4，删除pv；
   命令是pvremove pv名称
   可以通过pvdispay命令查看。
5，重新对物理卷格式化；fdisk /dev/sdb
6，重新生成文件系统；mkfs.xfs /dev/sdb1

以上就是整个过程，其中的（2，3，4，5，6）步的具体方法见链接：
http://www.litvip.com/351/

内容如下：

引用

LVM使用之三-从卷组VG移除并删除物理卷PV
发表于 2011 年 07 月 01 日 由 steptodream

删除硬盘的过程简单如下：
从VG删除PV->删除PV->删除该硬盘上的LVM分区->拔掉硬盘

第一步，从VG删除PV
1.删除前，先确认要删除的PV所在的VG情况：

[root@test ~]# vgdisplay -v
    Finding all volume groups
    Finding volume group "VolGroup00"
  --- Volume group ---
  VG Name               VolGroup00
  System ID
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  7
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               390.53 GB
  PE Size               32.00 MB
  Total PE              12497
  Alloc PE / Size       653 / 20.41 GB
  Free  PE / Size       11844 / 370.12 GB
  VG UUID               0UvEJz-rfLm-MVDb-20uW-JMCa-T14K-wCmyLO

  --- Logical volume ---
  LV Name                /dev/VolGroup00/LogVol00
  VG Name                VolGroup00
  LV UUID                fDHwa0-IUZV-no5O-RRJB-4N9o-U2MV-TAqucp
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                15.00 GB
  Current LE             480
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

  --- Logical volume ---
  LV Name                /dev/VolGroup00/LogVol01
  VG Name                VolGroup00
  LV UUID                cUjKA9-bI60-6R05-K0jS-MdXi-r26d-mfwU8X
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                5.41 GB
  Current LE             173
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1

  --- Physical volumes ---
  PV Name               /dev/cciss/c0d0p3
  PV UUID               6K7yBW-NuRf-3Quv-LU8U-6N1S-DmzG-ccCmbx
  PV Status             allocatable
  Total PE / Free PE    8122 / 7469

  PV Name               /dev/cciss/c0d1p1 <--要从VG里移除的PV
  PV UUID               TWzjBK-0N5x-1A6c-wht3-n4l1-7gFp-m24iy3
  PV Status             allocatable
  Total PE / Free PE    4375 / 4375

可以看到VG名为VolGroup00的最后那一段PV名字是/dev/cciss/c0d1p1就是我要从VG里删除的PV。

2.从VG删除PV
[root@test ~]#  vgreduce VolGroup00 /dev/cciss/c0d1p1
  Removed "/dev/cciss/c0d1p1" from volume group "VolGroup00"

3.确认是否已经删除

[root@test ~]# vgdisplay -v VolGroup00 | grep "/dev/cciss/c0d1p1"
    Using volume group(s) on command line
    Finding volume group "VolGroup00"

可以看到，VolGroup00里已经不包含名为/dev/cciss/c0d1p1的PV了。

第二步，删除PV
1.确认PV信息：


[root@test ~]# pvdisplay
  --- Physical volume ---
  PV Name               /dev/cciss/c0d0p3
  VG Name               VolGroup00
  PV Size               253.82 GB / not usable 6.99 MB
  Allocatable           yes
  PE Size (KByte)       32768
  Total PE              8122
  Free PE               7469
  Allocated PE          653
  PV UUID               6K7yBW-NuRf-3Quv-LU8U-6N1S-DmzG-ccCmbx

  "/dev/cciss/c0d1p1" is a new physical volume of "136.73 GB"
  --- NEW Physical volume ---
  PV Name               /dev/cciss/c0d1p1 <--我们要删除的PV
  VG Name
  PV Size               136.73 GB
  Allocatable           NO
  PE Size (KByte)       0
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               TWzjBK-0N5x-1A6c-wht3-n4l1-7gFp-m24iy3

名为/dev/cciss/c0d1p1的就是我们要删除的PV。

2.删除PV

[root@test ~]# pvremove /dev/cciss/c0d1p1
  Labels on physical volume "/dev/cciss/c0d1p1" successfully wiped

3.确认PV是否删除成功

[root@test ~]# pvdisplay | grep "/dev/cciss/c0d1p1"
[root@test ~]#

可见，已经删除成功。

第三步，删除该硬盘(/dev/cciss/c0d1)上的LVM分区(/dev/cciss/c0d1p1)

[root@test ~]# fdisk /dev/cciss/c0d1

The number of cylinders for this disk is set to 35139.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
   (e.g., DOS FDISK, OS/2 FDISK)

Command (m for help): p <--显示分区情况

Disk /dev/cciss/c0d1: 146.8 GB, 146807930880 bytes
255 heads, 32 sectors/track, 35139 cylinders
Units = cylinders of 8160 * 512 = 4177920 bytes

           Device Boot      Start         End      Blocks   Id  System
/dev/cciss/c0d1p1               1       35139   143367104   8e  Linux LVM

Command (m for help): d <--删除分区
Selected partition 1

Command (m for help): p <--在显示分区情况，发现已经没了

Disk /dev/cciss/c0d1: 146.8 GB, 146807930880 bytes
255 heads, 32 sectors/track, 35139 cylinders
Units = cylinders of 8160 * 512 = 4177920 bytes

           Device Boot      Start         End      Blocks   Id  System

Command (m for help): w <--保存退出
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

好了，现在可以拔掉硬盘了或者拿来做爱做之事！