[linux-lvm] Moving space between logical volumes?

[Chris Osicki]

Hi Howard

Your start point is "man lvreduce". Depending of the filesystem type
you're using you would have to find out how to resize the FS _before_
using lvreduce/lvextend. Depending on the FS type it may or may not be
possible to do it on a mounted FS. In worst case a boot from Rescue-CD
would be necessary == down-time.

You will have to do this:

	 resize (decrease size of) the file system on the huge_lvol
	 lvreduce huge_lvol
	 lvextend tight_lvol
	 resize (increase size of) the file system on the tight_lvol

LVols resizing was I think the first and most important motivation to
write LVM.
Good luck.

Regards,
Chris

On Wed, Aug 31, 2005 at 02:56:40PM -0500, Meadows, Howard T wrote:
> 
> I have a volume group with 4 logical volumes. One of the logical volumes has
> a huge amount of space allocated to it, and another is running out of its
> space.
> 
> I am assuming there is a way to re-allocate space from the one with lots of
> space to the one that is running out. I am nervous about using losing data
> with a reduce-extend combination of commands. Can someone who has done this
> explain exactly how this is done (safely)?
> 
> Thanks,
> 
> -Howard
> 
> 
> =======================================================
> Howard Meadows                 howard-meadows at uiowa.edu
> ITS - SPA, Unix Systems Group              319-335-5519
> The University of Iowa                    Iowa City, IA
>  
> 



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-- 

Chris Osicki osk at osk.ch
Dipl. Informatik-Ing. HTL