Re: about df and lvm

[Philip Rowlands]

On Tue, 4 Dec 2007, tq01azk wrote:

> test environment:
> centos 4.4
> Linux localhost.localdomain 2.6.9-55.0.12.ELsmp #1 SMP Fri Nov 2 11:19:08 EDT 
> 2007 i686 i686 i386 GNU/Linux
> lvm> version
>  LVM version:     2.02.21-RHEL4 (2007-03-26)
>  Library version: 1.02.17-RHEL4 (2007-04-24)
>  Driver version:  4.5.5
>
> I creat  4G of size  lvm  partition.
>
> #df -h
> /dev/mapper/lvtest-lv    4.0G  2.6G  1.3G  68% /mnt/lv
[snip]

> then I use the command "lvextend" to add 800M capatity into the lvm.
> but i also see the capatity is 4G by using df,lvdisplay show right information
>
> #lvextend -L +800M /dev/lvtest/lv
> Extending logical volume lv to 4.88 GB
> Logical volume lv successfully resized
> #df -h
> /dev/mapper/lvtest-lv    4.0G  2.6G  1.3G  68% /mnt/lv

Does lvextend affect the logical volume ("partition") size or the 
mounted filesystem? I think you'll need to run e2extend or other 
fs-specific tool to expand the filesystem structures, which is what df 
is reporting.


Cheers,
Phil