On Mon, Sep 22, 2003 at 01:48:09PM +0200, Måns Rullgård wrote:
> "Heinz J . Mauelshagen" <mauelshagen@sistina.com> writes:
>
> >> Is it possible to reduce the size of a PV, freeing some space at the
> >> end? I can make sure that the end is unused, of course.
> >
> > No such command implemented yet.
> >
> > Hack:
> > you can use LVM2 and change the text format of the metadata by hand
> > before running vgcfgrestore to store it back onto the PVs.
> >
> > If you want to follow this non-supported path, you want to take a
> > copy of the original metadata file in /etc/lvm/backup/ to be able to
> > back out gain.
>
> I'm already using lvm2. I noticed the pvresize command, but it just
> says it's not implemented yet. Any chance it will be some time soon?
We've got higher priority stuff in the works. Probably later this year.
>
> As for editing the metadata, I'm a little confused about the meaning
> of some fields. After running vgcfgbackup, I have this in the file:
>
> physical_volumes {
>
> pv0 {
> id = "eZV4mb-jk4z-pyfm-tGbJ-mBSW-drRT-ZHtgmn"
> device = "/dev/discs/disc0/part2" # Hint only
>
> status = ["ALLOCATABLE"]
> pe_start = 65920
> pe_count = 1189 # 37.1562 Gigabytes
> }
> }
>
> What is the meaning of the pe_start field? If I wanted to reduce the
> size by, say, 1 GB, would it be correct to reduce pe_count by 32, the
> PE size being 32 MB?
pe_start is the sector offset into the device.
Yes, you need to reduce pe_count by 32 making it 1157 and vgcfgrestore.
You need to have recent LVM2 code so that vgcfgrestore updates the pe_count
properly (and of course, the 32 PEs need to be empty).
>
> --
> Måns Rullgård
> mru@users.sf.net
>
>
> _______________________________________________
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> linux-lvm@sistina.com
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
--
Regards,
Heinz -- The LVM Guy --
*** Software bugs are stupid.
Nevertheless it needs not so stupid people to solve them ***
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Heinz Mauelshagen Sistina Software Inc.
Senior Consultant/Developer Am Sonnenhang 11
56242 Marienrachdorf
Germany
Mauelshagen@Sistina.com +49 2626 141200
FAX 924446
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