[linux-lvm] Reclaim free space

[linux-lvm] Reclaim free space

[Ian Burrell]

How do I reclaim the free space when a logical volume is reduced?  I am 
using a volume group on one physical volume and three logical volumes.

I wanted to split off /usr/local and give it some space from reducing 
another volume.  I shrank the existing logical volume with "ext2fsadm". 
  After, the volume group had the same amount of free space as before. 
I went ahead and created the new LV in that free space but would like to 
make it bigger.  Now "vgdisplay" shows the volume group as being 
completely full.  Except the allocated space for the logical volumes are 
less than the total space.

  - Ian

Re: [linux-lvm] Reclaim free space

[Ian Burrell]

Ian Burrell wrote:
> How do I reclaim the free space when a logical volume is reduced?  I am 
> using a volume group on one physical volume and three logical volumes.
> 

I figured out my problem.  I had a test logical volume that was taking 
up the space.  I removed it and everything is working fine.

  - Ian

Re: [linux-lvm] Reclaim free space

[Chris Cox]

Ian Burrell wrote:
> How do I reclaim the free space when a logical volume is reduced?  I am 
> using a volume group on one physical volume and three logical volumes.
> 
> I wanted to split off /usr/local and give it some space from reducing 
> another volume.  I shrank the existing logical volume with "ext2fsadm". 
>  After, the volume group had the same amount of free space as before. I 
> went ahead and created the new LV in that free space but would like to 
> make it bigger.  Now "vgdisplay" shows the volume group as being 
> completely full.  Except the allocated space for the logical volumes are 
> less than the total space.

1. Shrink the filesystem (sounds like you've done this).

2. Shrink the lv (lvreduce)... be careful!!

3. Expand the filesystem to fill any gap (error) in the lvreduce.

Re: [linux-lvm] Reclaim free space

[Heinz J . Mauelshagen]

On Thu, Dec 18, 2003 at 01:31:13PM -0800, Ian Burrell wrote:
> How do I reclaim the free space when a logical volume is reduced?  I am 
> using a volume group on one physical volume and three logical volumes.
> 
> I wanted to split off /usr/local and give it some space from reducing 
> another volume.  I shrank the existing logical volume with "ext2fsadm". 

Hi Ian,

did e2fsadm display some error ?
That would explain that you didn't get more free space in the VG,
because the LV won't be reduced in that case.

I guess with 'allocated space' you mean the sum of the filesystem space.
Check with "tune2fs -l ..." what the actual filesystem sizes are
and how that fits the LV sizses (vgdisplay -v / lvdisplay -v /dev/VG/LV).

>   After, the volume group had the same amount of free space as before. 
> I went ahead and created the new LV in that free space but would like to 
> make it bigger.  Now "vgdisplay" shows the volume group as being 
> completely full.  Except the allocated space for the logical volumes are 
> less than the total space.
> 
>   - Ian
> 
> 
> 
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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 ***

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Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen@Sistina.com                           +49 2626 141200
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