Volume Groups

[Fernando Silva]

Can we change a Volume Group, just changing the name, or we have to add a new VGroup to the fisical devices?

[Jeff Schussele]

Hi Fernando,

You can just vgexport the VG & vgimport it into a new VG name.
Even though it's not required, make a backup beforehand just to be safe.

Rgds,
Jeff

[Pete Randall]

Fernando,

You can use vgexport/vgimport to accomplish this.

First export the VG:
vgexport -s -m /tmp/vgXXmap /dev/vgXX

Then create the device files:
mkdir /dev/vgYY
mknod /dev/vgYY/group c64 0xYY0000

Then import the VG
vgimport -s -m /tmp/vgXXmap /dev/vgYY


Note the vgnames in the vgimport command differ for the map name and the actual (new) VG.


Pete

[A. Clay Stephenson]

Just do a vgexport, create the new /dev/vgxx directory and the new /dev/vgxx/group device node and do your vgimport. If you are using non-standard LVOL names then you should use -m mapfile for both your vgexport and vgimport to preserve them.

Plan B. If you are using raw devices then simply set up symbolic links to the desired lvols.

[Sundar_7]

Hi Silva,

1) Unmount the logical volumes

2) Deactivate the volume group

# vgchange -a n /dev/vg02

3) Export the VG

# vgexport -v -s -m /vg02.map /dev/vg02

4) create the files for the new vg

# mkdir /dev/vgnew

# mknod /dev/vgnew c 64 0x050000

# vgimport -v -s -m /vg02.map /dev/vg02

5) Edit /etc/fstab and /etc/lvmrc if required.

-- Sundar.