Re: [Xen-users] Convert LVM to Images

["Peter Gansterer" <peter.gansterer@xxxxxxxxxxxxx>]

On 2013-04-04 23:56:49 agya naila wrote:
> Hi Jacek,
> 
> LVM used for my DomU installation, that why I am looking for best practices
> to ensure the file didn't damage, is it safe using lvresize or lvreduce?

No.
You have to shrink the filesystem that's contained in the LV first.
How to do that depends on the filesystem your domU is using on the LV. For 
recent linux filesystems (ext3/4, btrfs, reiserfs, xfs, ...) there are tools to 
do that. For Windows (NTFS) I think you have to do it in the domU itself.

Another option would be to just make sure the free space is "filled by zeros" 
(eg. temporarily fill it with "large empty files") and then create a sparse 
image:

   dd if=... of=... bs=1M conv=sparse
   (use "ls -ls" to see the actually used size of the resulting file!)


- peter.

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