[linux-lvm] vgexport usage

[Anderson Kaiser]

On 03/17/2011 02:32 PM, Males, Jess wrote:
> > From 'man 8 vgexport':
> vgexport allows you to make the inactive VolumeGroupName(s) unknown to  the  system.
>
> By 'unknown to the system' I would expect it would not appear in vg listings such as vgs (shown below) or vgdisplay.
>
> [root at icarus lvm]# vgcreate junk /dev/loop1 /dev/loop2 /dev/loop3
>    Volume group "junk" successfully created
> [root at icarus lvm]# vgs
>    VG         #PV #LV #SN Attr   VSize  VFree
>    junk         3   0   0 wz--n- 48.00M 48.00M
> [root at icarus lvm]# vgchange junk -a n
>    0 logical volume(s) in volume group "junk" now active
> [root at icarus lvm]# vgs
>    VG         #PV #LV #SN Attr   VSize  VFree
>    junk         3   0   0 wz--n- 48.00M 48.00M
> [root at icarus lvm]# vgexport junk
>    Volume group "junk" successfully exported
> [root at icarus lvm]# vgs
>    VG         #PV #LV #SN Attr   VSize  VFree
>    junk         3   0   0 wzx-n- 48.00M 48.00M
>
>
> However, more disturbing is that if I remove one of the disks, lvm complains about a missing item.
>
> [root at icarus lvm]# losetup -d /dev/loop2
> [root at icarus lvm]# vgs
>    Couldn't find device with uuid 1gNBDl-dOqI-OQid-TIcq-8Lp2-qUa2-PwdvnB.
>    VG         #PV #LV #SN Attr   VSize  VFree
>    junk         3   0   0 wzxpn- 48.00M 48.00M
>
>
> Am I expecting the wrong things from this command?
>
>
> Thanks,
>
> -- Jess Males
>
>
>
> _______________________________________________
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
  Maybe "unknown" is the wrong word in this case. You will be able to 
see this VG using vgs, vgdisplay and so on. But you can't remove when 
you try a vgremove.

You have to import it back (vgimport VolumeGroup) to change it again.

I think that unknown means more like "unchangeable".

[]'s

-- 
Anderson Kaiser (RHCE, RHCVA)
Red Hat Brasil - Global Support Services
akaiser at redhat.com
+55 11 3529-6000
Direct: +55 11 3529-6093