[linux-lvm] Total free space using added VGs and LVs

David dramdayal at gmail.com
Wed Oct 21 22:54:08 UTC 2009

Is there anyway to recover a lost VolGroup if I have the UUID?

On Wed, Oct 21, 2009 at 3:03 PM, Lou Arnold <larnolda1 at gmail.com> wrote:

> I read the How-To. It doesn't talk about the specific case or being mounted
> at root, so I had to experiment. It is likely that commands were in the
> wrong order, but I don't know what the right order is.
> I have attached the terminal session I used. In the end it did not work.
> There was still 66 GB free, and when I rebooted, the file system failed. The
> superblock was too big.
> I obviously don't understand the difference between pvresize, lvreduce and
> vgreduce, and how  resize2fs  is related to these commands.
> Hope you can help,
> Lou.
> On 10/21/09, Drew <drew.kay at gmail.com> wrote:
>> > The documentation wasn't specific. I believe the intent was simply to
>> > migrate the data to another logical volume to temporarily allow the
>> source
>> > volume to be reduced and/or removed. But let's assume that has happened
>> or
>> > that doesn't need to happen. So now we need to unmount LogVol00, reduce
>> it
>> > to its original nunber of extents and then remount it (either before or
>> > after remount we remove the physical drive.) I assume you can't try this
>> or
>> > you'll screw up your computer, but I have a system that I screw up and
>> > easily restore from a OS image. So no need to be too cautious.
>> I've done this on several occasions.
>> If you want to play with various scenarios in LVM, I'd recommend
>> reading the LVM How-To @ http://tldp.org/HOWTO/LVM-HOWTO/ . Sections
>> 11 & 13 cover the most common tasks you'll encounter in LVM. Play
>> around, don't be afraid to break things, and if you have questions
>> feel free to give the list a shout.
>> --
>> Drew
>> "Nothing in life is to be feared. It is only to be understood."
>> --Marie Curie
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