CentOS挂载lvm分区VG重名问题

卷组（Volume Group）简称VG，它是一个或者多个物理卷的组合。卷组将多个物理卷组合在一起，形成一个可管理的单元，它类似于非LVM系统中的物理硬盘。

具体原因是：公司业务其中一台centos服务器的操作系统启动不了，需要恢复其中的数据，将硬盘挂载到能正常启动的服务器上面，但是出现VG重名的问题，挂载不了的情况，具体解决思路如下

1.使用pvs/lvs/vgs查看具体的LVM情况

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[root@localhost ~]# pvs
  PV         VG     Fmt  Attr PSize   PFree
  /dev/sda3  centos lvm2 a--  556.66g 4.00m
  /dev/sdc1  centos lvm2 a--  279.39g    0 
  /dev/sdd2  centos lvm2 a--  278.39g 4.00m
[root@localhost ~]# lvs
  LV   VG     Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  home centos -wi-a----- 491.09g                                                    
  home centos -wi------- 495.97g                                                    
  root centos -wi-ao----  50.00g                                                    
  root centos -wi-------  50.00g                                                    
  swap centos -wi-ao----  15.56g                                                    
  swap centos -wi-------  11.81g

[root@localhost ~]# vgs -v
    Cache: Duplicate VG name centos: Prefer existing gEVmfo-SGj8-B3Ij-9O3U-jd3a-TftX-OMVfY6 vs new WTOf0a-fVj9-lNK2-AJOU-Q4nA-xuVk-H9AYi4
    Cache: Duplicate VG name centos: Prefer existing gEVmfo-SGj8-B3Ij-9O3U-jd3a-TftX-OMVfY6 vs new WTOf0a-fVj9-lNK2-AJOU-Q4nA-xuVk-H9AYi4
    Cache: Duplicate VG name centos: Prefer existing WTOf0a-fVj9-lNK2-AJOU-Q4nA-xuVk-H9AYi4 vs new gEVmfo-SGj8-B3Ij-9O3U-jd3a-TftX-OMVfY6
    Archiving volume group "centos" metadata (seqno 4).
    Archiving volume group "centos" metadata (seqno 4).
    Creating volume group backup "/etc/lvm/backup/centos" (seqno 4).
  VG     Attr   Ext   #PV #LV #SN VSize    VFree VG UUID                                VProfile
  centos wz--n- 4.00m   1   3   0  556.66g 4.00m WTOf0a-fVj9-lNK2-AJOU-Q4nA-xuVk-H9AYi4         
  centos wz--n- 4.00m   2   3   0 <557.79g 4.00m gEVmfo-SGj8-B3Ij-9O3U-jd3a-TftX-OMVfY6

以上发现现有系统的LVM和挂载的硬盘（故障系统）的LVM的VG名称重复，有多个root、home的LV

2.通过vg的uuid改名

如果通过VG名称进行变更，会提示报错，需要通过UUID进行改名，其中uuid是通过上面的vgs -v查看

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[root@localhost ~]# vgrename gEVmfo-SGj8-B3Ij-9O3U-jd3a-TftX-OMVfY6 centos01
  Processing VG centos because of matching UUID gEVmfo-SGj8-B3Ij-9O3U-jd3a-TftX-OMVfY6
  Volume group "gEVmfo-SGj8-B3Ij-9O3U-jd3a-TftX-OMVfY6" successfully renamed to "centos01"

3.查看lv状态，发现有几个是inactive

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[root@localhost ~]# vgs
  VG       #PV #LV #SN Attr   VSize    VFree
  centos     1   3   0 wz--n-  556.66g 4.00m
  centos01   2   3   0 wz--n- <557.79g 4.00m
[root@localhost ~]# lvscan
  ACTIVE            '/dev/centos/swap' [15.56 GiB] inherit
  ACTIVE            '/dev/centos/home' [491.09 GiB] inherit
  ACTIVE            '/dev/centos/root' [50.00 GiB] inherit
  inactive          '/dev/centos01/swap' [11.81 GiB] inherit
  inactive          '/dev/centos01/home' [495.97 GiB] inherit
  inactive          '/dev/centos01/root' [50.00 GiB] inherit

4.修改vg的属性

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[root@localhost ~]# vgchange -ay /dev/centos01
  3 logical volume(s) in volume group "centos01" now active
[root@localhost ~]# lvscan
  ACTIVE            '/dev/centos/swap' [15.56 GiB] inherit
  ACTIVE            '/dev/centos/home' [491.09 GiB] inherit
  ACTIVE            '/dev/centos/root' [50.00 GiB] inherit
  ACTIVE            '/dev/centos01/swap' [11.81 GiB] inherit
  ACTIVE            '/dev/centos01/home' [495.97 GiB] inherit
  ACTIVE            '/dev/centos01/root' [50.00 GiB] inherit

5.挂载目录

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[root@localhost ~]# cd /
[root@localhost /]# mkdir centos01-root
[root@localhost /]# mkdir centos01-home
[root@localhost /]# mount /dev/centos01/root /centos01-root/
[root@localhost /]# mount /dev/centos01/home /centos01-home/
[root@localhost /]# cd centos01-root
[root@localhost centos01-root]# ls
bin  boot  dev  etc  home  lib  lib64  media  mnt  opt  proc  root  run  sbin  sk  srv  sys  tmp  usr  var

通过以上操作，即可恢复文件。