Clear, thanks :) On Mon, Apr 20, 2015 at 11:46:38AM +0100, Darac Marjal wrote: > On Mon, Apr 20, 2015 at 12:05:17PM +0200, Dark Victorian Spirit wrote: > > 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? > > I believe so. Under Linux, partition types are mostly bookkeeping. > According to wikipedia, some partition types imply certain access > schemes (such as saying that a XENIX root partition (type 02h) should > only be accessed using CHS, not LBA), but no such restrictions apply to > Linux partitions. The Partition Type doesn't constrain the data stored > on the partition - that is, you can put an NTFS filesystem into a > "Linux" partition, even though there's a different code for NTFS. > > To cut a long story short, yes, you should be fine. Nothing's ever > entirely risk-free, though so A) "if it ain't broke, don't fix it" and > B) backup before you change it :) > > > > > > > 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 > >
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