Copy logical volumes between volumegroups

[Bruno Bossier_1]

Can I copy a raw device (in a RAC environment) between volumegroups ? The target lv is in a different vg than the source lv.

What method should I use best ?

Bruno

[Steven E. Protter]

You might be able to do this:

vgexport the volume group including the raw devicee.

vgimport it into an new volume group.

That does the whole volume group and you want to do one logical volume.

You might be able to dump it and then read the dump.

The supported methodology from the oracle standpoint would be to export the data from the raw disk area and then set up a new empty raw disk area in the new volume group and import the data.

Another reason why at my previous shop we kept our data on filesystems.

SEP

[Bruno Bossier_1]

Hmm ... can't export the volumegroup as it is production and should stay online.

I thought this :

- add new disks (from a different storage arry) to existing vg
- create mirrors on these new disks
- split lv's

Unfortunately, lvsplit does not work on shared vg's.

Maybe dd ?

[Alex Lavrov.]

You can't copy the raw device of the living database. Physically you can, but later it won't work because when ut's under use it's not consistent.

[Bruno Bossier_1]

We would off course stop the database first ....