On Wednesday 15 August 2007 13:18, Bryn M. Reeves wrote: > Lothar Werzinger wrote: > > What I would like to do is to unmount LV2 and be able to remove the > > external disk from the Ultrabay to replace it with a DVD drive while > > still be able to acess the filesystem on LV1 (which uses only space on > > the internal disk). I would like to do this to backup data from LV1 to > > DVD-RW. > > > > Is this possible with LVM? How would I go and prepare the external disk > > for removal? How would I reconnect if I insert the disk again. > > It is possible, but not with both PVs in the same VG (well, not unless > you want to be doing a lot of manual tweaking and fiddling as you > plug/unplug the external drive and even then you would need to be > extremely careful when changing/resizing LVs - basically, don't! :). > > If you put LV2 in its own VG then you can achieve exactly what you > describe via: > > umount /path/to/LV2 > vgchange -an VG2 > > Then remove the external disk. Optionally, you could mark the VG as > exported with vgexport if you wanted to move it between different hosts. > > To re-activate it, plug it back in and re-activate it: > > vgchange -ay VG2 > > Preceding that with a vgimport if you did choose to export the VG. > > Depending on the versions of the tools you are using and they way you > configured the physical volumes when you set them up you can probably > break the VG up using vgsplit. I read the manpage to vgsplit and I am lost :-( Can two VGs use the same PV? How do they know how to share the space? can you give an example on how I might use vgsplit? Here's the version I used: vgcreate --version LVM version: 2.02.26 (2007-06-15) Library version: 1.02.20 (2007-06-15) Driver version: 4.11.0 > Kind regards, > Bryn. Lothar _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
