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



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

thanks,
David
On Wed, Oct 21, 2009 at 3:03 PM, Lou Arnold <larnolda1 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 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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