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13.6. Moving a volume group to another system

It is quite easy to move a whole volume group to another system if, for example, a user department acquires a new server. To do this we use the vgexport and vgimport commands.

Note

vgexport/vgimport is not necessary to move drives from one system to another. It is an administrative policy tool to prevent access to volumes in the time it takes to move them.

13.6.1. Unmount the file system

First, make sure that no users are accessing files on the active volume, then unmount it


# unmount /mnt/design/users
          

13.6.2. Mark the volume group inactive

Marking the volume group inactive removes it from the kernel and prevents any further activity on it.


# vgchange -an design
vgchange -- volume group "design" successfully deactivated
          

13.6.3. Export the volume group

It is now necessary to export the volume group. This prevents it from being accessed on the ``old'' host system and prepares it to be removed.


# vgexport design
vgexport -- volume group "design" successfully exported
          
When the machine is next shut down, the disk can be unplugged and then connected to it's new machine

13.6.4. Import the volume group

When plugged into the new system it becomes /dev/sdb so an initial pvscan shows:


# pvscan
pvscan -- reading all physical volumes (this may take a while...)
pvscan -- inactive PV "/dev/sdb1"  is in EXPORTED VG "design" [996 MB / 996 MB free]
pvscan -- inactive PV "/dev/sdb2"  is in EXPORTED VG "design" [996 MB / 244 MB free]
pvscan -- total: 2 [1.95 GB] / in use: 2 [1.95 GB] / in no VG: 0 [0]
          
We can now import the volume group (which also activates it) and mount the file system.

If you are importing on an LVM 2 system, run:


# vgimport design
  Volume group "vg" successfully imported
          

If you are importing on an LVM 1 system, add the PVs that need to be imported:


# vgimport design /dev/sdb1 /dev/sdb2
vgimport -- doing automatic backup of volume group "design"
vgimport -- volume group "design" successfully imported and activated
          

13.6.5. Activate the volume group

You must activate the volume group before you can access it.


# vgchange -ay design
          

13.6.6. Mount the file system


# mkdir -p /mnt/design/users
# mount /dev/design/users /mnt/design/users
          
The file system is now available for use.