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

Ryan Anderson ryan at worldspice.net
Wed Oct 21 19:18:25 UTC 2009


I'm new to this list and have not posted here before, so I am not sure
if this is the advice you'd eventually get, but it seems like you should
focus on the basics. You will need to understand the individual
components before a the more task-oriented parts of a how-to will be of
use. Following a step-by-step guide will get you a result, but if you
don't understand the steps the result probably won't be of any use to you.

The how-to has a good breakdown of the anatomy of LVM; that might be the
best place to start, focusing on the differences between Physical
Volumes, Volume Groups, Logical Volumes and where in that arrangement a
filesystem is placed.

Lou Arnold 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 <mailto: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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> linux-lvm at redhat.com
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/


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