topic Volume Groups in Operating System - HP-UX

Volume Groups

Fernando Silva — Fri, 06 Feb 2004 12:19:55 GMT

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

Re: Volume Groups

Jeff Schussele — Fri, 06 Feb 2004 12:23:05 GMT

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

Re: Volume Groups

Pete Randall — Fri, 06 Feb 2004 12:25:34 GMT

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

Re: Volume Groups

A. Clay Stephenson — Fri, 06 Feb 2004 12:27:39 GMT

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.

Re: Volume Groups

Sundar_7 — Fri, 06 Feb 2004 17:02:51 GMT

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.