I hope i can ask a question on top of this one, what if i have a PV which is configured and in use for a while, but i found out that i forgot to set the pertition type on LVM.
Can i still change this without data loss or risk? And if i don't will i face issues of another kind? On Mon, Apr 20, 2015 at 10:33:13AM +0100, Darac Marjal wrote: > On Mon, Apr 20, 2015 at 09:26:54AM +0200, Petter Adsen wrote: > > Is it possible to have two VGs on the same PV? > > I don't believe so. The VG is the mapping layer in the LVM stack. It > maps the LVs to the PVs. If you were to share a PV between VGs, then > you'd need some way to tell the VGs which parts of the PV they can use > (letting them battle it out and potentially over-commit the PV is not > really a good idea). The easiest idea is to split the underlying device > into multiple PVs (e.g. use partitions). > > > > > If so, how can I make a VG with lots of free space smaller? I'm > > suspecting that the answer to my first question is "no", since this > > doesn't seem possible from the man pages. > > A quick bit of searching suggests the incantation would be: > * Boot from a rescue/live disc > * Activate your VG > * (You say you've got unallocated space in your VG, so resizing > filesystems/LVs won't be covered) > * "lvm pvs" should, at this point, indicate some PFree, which is how > much you can shrink the PV > * Run "lvm pvresize /dev/whatever --setphysicalvolumesize 50G" > (Where /dev/whatever is the PV device and 50G is the new size to > resize to) > * Finally, resize the PV's partition appropriately. > > At this point, you will have a smaller PV and less unallocated space in > your VG. You can now create another partition, PV that and add it to a > second VG. > > > > > Petter > > > > -- > > "I'm ionized" > > "Are you sure?" > > "I'm positive." > > -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/20150420100517.ga5...@kernelbug.org