lvm修改vg名字

信息收集
修改vg名称
mount文件系统

因一CentOS主机文件系统故障系统无法启动，需要将硬盘挂载到另外的主机上备份数据，但因为两台主机安装时都使用的缺省命名，造成Volume group重名(系统中有两个VolGroup00)无法挂载。

需要将故障硬盘的vgname修改后才能挂载，操作步骤如下：

信息收集

lvm  # 进入lvm环境

# 查看物理卷
lvm> pvs -v 
    Scanning for physical volume names
  PV         VG         Fmt  Attr PSize  PFree DevSize PV UUID                               
  /dev/hda2  VolGroup00 lvm2 a-   59.88G    0   59.90G 0m2CBI-2Riw-aN0j-jej2-v7ix-G8MK-l8Ve0P
  /dev/hdb2  VolGroup00 lvm2 a-   79.88G    0   79.90G 3SUISX-C95S-gvt9-N3Yg-wTJu-B7fh-wrHORh

# 查看卷组，有两个同名的卷组VolGroup00，分别是两个硬盘上的
lvm> vgs -v
    Finding all volume groups
    Finding volume group "VolGroup00"
    Finding volume group "VolGroup00"
    Archiving volume group "VolGroup00" metadata (seqno 3).
    Archiving volume group "VolGroup00" metadata (seqno 3).
    Creating volume group backup "/etc/lvm/backup/VolGroup00" (seqno 3).
  VG         Attr   Ext    #PV #LV #SN VSize  VFree VG UUID                               
  VolGroup00 wz--n- 32.00M   1   2   0 79.88G    0  2iZ9Ue-JPU0-GUa1-WOUC-LaqI-g4nB-AVqotw #注意这个vg的uuid，后面会用到
  VolGroup00 wz--n- 32.00M   1   2   0 59.88G    0  VCk0AU-gshw-vCNb-8kwQ-efOq-KMBC-OdpcRc

# 只能看到第一个vg上的逻辑卷
lvm> lvs -v
    Finding all logical volumes
  LV       VG         #Seg Attr   LSize  Maj Min KMaj KMin Origin Snap%  Move Copy%  Log Convert LV UUID                               
  LogVol00 VolGroup00    1 -wi-ao 54.16G  -1  -1 253  0                                          FI1JkF-qEhd-f7ui-ghQS-dsLy-zTeh-u7WAEn
  LogVol01 VolGroup00    1 -wi-ao  5.72G  -1  -1 253  1                                          VZ6fDl-VwWU-x7ct-jt6c-dfe7-0aft-c3Fdoh

修改vg名称

# 改vgname，uuid是上面vgs -v里查到的对应vg标识
lvm> vgrename 2iZ9Ue-JPU0-GUa1-WOUC-LaqI-g4nB-AVqotw VGmaven
  Volume group "VolGroup00" successfully renamed to "VGmaven"

# 查看修改结果
lvm> vgs -v
    Finding all volume groups
    Finding volume group "VGmaven"
    Finding volume group "VolGroup00"
    Archiving volume group "VolGroup00" metadata (seqno 3).
    Creating volume group backup "/etc/lvm/backup/VolGroup00" (seqno 3).
  VG         Attr   Ext    #PV #LV #SN VSize  VFree VG UUID                               
  VGmaven    wz--n- 32.00M   1   2   0 79.88G    0  2iZ9Ue-JPU0-GUa1-WOUC-LaqI-g4nB-AVqotw
  VolGroup00 wz--n- 32.00M   1   2   0 59.88G    0  VCk0AU-gshw-vCNb-8kwQ-efOq-KMBC-OdpcRc

# 新改名的卷组是inactive了，2个分区LogVol00和LogVol01
lvm> lvscan 
  ACTIVE            '/dev/VolGroup00/LogVol00' [54.16 GB] inherit
  ACTIVE            '/dev/VolGroup00/LogVol01' [5.72 GB] inherit
  inactive          '/dev/VGmaven/LogVol00' [77.84 GB] inherit
  inactive          '/dev/VGmaven/LogVol01' [2.03 GB] inherit

# 用vgchange加载我们该名过的 VGmaven 卷组,提示active状态成功：
lvm> vgchange -ay /dev/VGmaven
  2 logical volume(s) in volume group "VGmaven" now active

lvm> lvscan
  ACTIVE            '/dev/VolGroup00/LogVol00' [54.16 GB] inherit
  ACTIVE            '/dev/VolGroup00/LogVol01' [5.72 GB] inherit
  ACTIVE            '/dev/VGmaven/LogVol00' [77.84 GB] inherit
  ACTIVE            '/dev/VGmaven/LogVol01' [2.03 GB] inherit

mount文件系统

ll /dev/VGmaven/
total 0
lrwxrwxrwx 1 root root 28 Jul 26 02:26 LogVol00 -> /dev/mapper/VGmaven-LogVol00
lrwxrwxrwx 1 root root 28 Jul 26 02:26 LogVol01 -> /dev/mapper/VGmaven-LogVol01

mount /dev/VGmaven/LogVol00 /mnt/maven/

df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                       53G   14G   37G  28% /
/dev/hda1              99M   13M   82M  14% /boot
tmpfs                 1.9G     0  1.9G   0% /dev/shm
/dev/mapper/VGmaven-LogVol00