VG信息的导出导入

VG信息的导出导入

1、umount已经挂载的LV
[root@racdb2 ~]# df -h
文件系统              容量  已用 可用 已用% 挂载点
/dev/sda1              18G   14G  2.6G  85% /
tmpfs                 1.5G  154M  1.4G  11% /dev/shm
/dev/mapper/myvg-db_bak
                      5.0G  148M  4.6G   4% /db_bak
[root@racdb2 ~]# cd
[root@racdb2 ~]# umount /dev/mapper/myvg-db_bak
[root@racdb2 ~]# df -h
文件系统              容量  已用 可用 已用% 挂载点
/dev/sda1              18G   14G  2.6G  85% /
tmpfs                 1.5G  154M  1.4G  11% /dev/shm

2、将VG inactive：
[root@racdb2 ~]# lvscan
  ACTIVE            '/dev/myvg/tnms_his01' [20.00 MB] inherit
  ACTIVE            '/dev/myvg/tnms_his02' [20.00 MB] inherit
  ACTIVE            '/dev/myvg/tnms_his03' [20.00 MB] inherit
  ACTIVE            '/dev/myvg/tnms_his04' [20.00 MB] inherit
  ACTIVE            '/dev/myvg/tnms_his05' [20.00 MB] inherit
  ACTIVE            '/dev/myvg/db_bak' [5.00 GB] inherit
  ACTIVE            '/dev/myvg/remainder' [20.00 MB] inherit
  ACTIVE            '/dev/myvg/tnms_his06' [20.00 MB] inherit
   
[root@racdb2 ~]# vgchange -an myvg
  0 logical volume(s) in volume group "myvg" now active

[root@racdb2 ~]# lvscan
  inactive          '/dev/myvg/tnms_his01' [20.00 MB] inherit
  inactive          '/dev/myvg/tnms_his02' [20.00 MB] inherit
  inactive          '/dev/myvg/tnms_his03' [20.00 MB] inherit
  inactive          '/dev/myvg/tnms_his04' [20.00 MB] inherit
  inactive          '/dev/myvg/tnms_his05' [20.00 MB] inherit
  inactive          '/dev/myvg/db_bak' [5.00 GB] inherit
  inactive          '/dev/myvg/remainder' [20.00 MB] inherit
  inactive          '/dev/myvg/tnms_his06' [20.00 MB] inherit

[root@racdb2 ~]# vgexport -v myvg
    Using volume group(s) on command line
    Finding volume group "myvg"
    Archiving volume group "myvg" metadata (seqno 36).
    Creating volume group backup "/etc/lvm/backup/myvg" (seqno 37).
  Volume group "myvg" successfully exported

[root@racdb2 ~]# lvscan
  Volume group myvg is exported
 
---将本机的VG导出之后发现本机的LV全部不见了，之后又将导出的VG导回本机，LV出现了，这里没搞明白，为啥导出了本机的LV就不见了，
郁闷啊。。。。。。。无奈，只好又把导出的VG导回去，就又看到之前的LV了。

[root@racdb2 ~]# vgimport -v myvg
    Using volume group(s) on command line
    Finding volume group "myvg"
    Archiving volume group "myvg" metadata (seqno 39).
    Creating volume group backup "/etc/lvm/backup/myvg" (seqno 40).
  Volume group "myvg" successfully imported

[root@racdb2 ~]# lvscan
  inactive          '/dev/myvg/tnms_his01' [20.00 MB] inherit
  inactive          '/dev/myvg/tnms_his02' [20.00 MB] inherit
  inactive          '/dev/myvg/tnms_his03' [20.00 MB] inherit
  inactive          '/dev/myvg/tnms_his04' [20.00 MB] inherit
  inactive          '/dev/myvg/tnms_his05' [20.00 MB] inherit
  inactive          '/dev/myvg/db_bak' [5.00 GB] inherit
  inactive          '/dev/myvg/remainder' [20.00 MB] inherit
  inactive          '/dev/myvg/tnms_his06' [20.00 MB] inherit
 
[root@racdb2 ~]# vgchange -ay myvg
  8 logical volume(s) in volume group "myvg" now active

[root@racdb2 ~]# lvscan
  ACTIVE            '/dev/myvg/tnms_his01' [20.00 MB] inherit
  ACTIVE            '/dev/myvg/tnms_his02' [20.00 MB] inherit
  ACTIVE            '/dev/myvg/tnms_his03' [20.00 MB] inherit
  ACTIVE            '/dev/myvg/tnms_his04' [20.00 MB] inherit
  ACTIVE            '/dev/myvg/tnms_his05' [20.00 MB] inherit
  ACTIVE            '/dev/myvg/db_bak' [5.00 GB] inherit
  ACTIVE            '/dev/myvg/remainder' [20.00 MB] inherit
  ACTIVE            '/dev/myvg/tnms_his06' [20.00 MB] inherit

[root@racdb2 mapper]# mount /dev/myvg/db_bak /db_bak
[root@racdb2 mapper]# df -h
文件系统              容量  已用 可用 已用% 挂载点
/dev/sda1              18G   14G  2.6G  85% /
tmpfs                 1.5G  154M  1.4G  11% /dev/shm
/dev/mapper/myvg-db_bak
                      5.0G  148M  4.6G   4% /db_bak

将备份好的/etc/lvm/backup/myvg放到备机上进行导入，过程如上；