[CentOS] Freeing pv space for snapshots

Fri Jan 5 12:26:39 UTC 2007
Paul <unix at bikesn4x4s.com>

On Thu, January 4, 2007 11:11 pm, Aleksandar Milivojevic wrote:
> Robert Becker Cope wrote:
>> "Paul" <unix at bikesn4x4s.com> wrote:
>>
>>> Thanks, and where can I find a version of ext2resize that will work
>>
>> You want "resize2fs". Note that I've never used it to shrink a
>> filesystem,
>> myself, only to grow one.
>
> I've used it, and it works correctly (and it is available in CentOS
> 4.4).  It shrinks file system as it should.  The only things Paul should
> be careful is to first shrink file system, than logical volume and to
> correctly calculate file system size and by how many extents he can
> shrink logical volume.  If he shrinks logical volume too much, he might
> end up loosing data.  Running fsck in non-destructive mode (fsck -N)
> and/or attempting to mount file system read-only after he shrinks
> logical volume might be a good idea to test all is OK.

Thanks all.  And can I use it when the system is online?  I would think
that would be the only way I could do it, cause I can't get to the ext3 fs
of the LV unless its online.