Howard I've got more experience with growing filesystems as with reducing them. Never managed to delete enough data so a shring would make sense ;-) Just yesterday I inncreased size of a ext3 FS by doing this umount /local lvextend --size +4G /dev/gv00/local resize2fs resize2fs asked me to fsck -f /dev/gv00/local mount /local That was it. Shrinking is a bit more tricky as you have to be careful shrinking your LVol not to make is smaller than the filesystem. I've never used tune2fs or e2fsadm for this purpose and I think it's not the way to go. Hope it helps. Regards, Chris On Thu, 1 Sep 2005 10:28:57 -0500 "Meadows, Howard T" <howard-meadows@uiowa.edu> wrote: > Chris, > > Thanks for your reply. The logical volumes in question are ext3 > filesystems. I did read the man page for lvreduce and its warning about > possible loss of data was what originally prompted me to ask for help. > > I do not want to resize the partition (they are all on the same > partition), so I am wondering if e2fsadm might do the trick? It looks like > you can shrink (and expand) logical volumes using e2fsadm with the > restriction that shrinking only works on unmounted filesystems (if I'm > reading the man page correctly). So... my current thought is as follows: > > * unmount the filesystems in question. > * use 'tune2fs -O ^has_journal /dev/sda5' to turn off journaling > * use 'e2fsadm -L -100G /dev/vg/lv1' to reduce lv1 by 100GB > * use 'e2fsadm -L +100G /dev/vg/lv2' to increase lv2 by 100GB > * use 'e2fsck -f /dev/sda5' to check the filesystems > * use 'tune2fs -j /dev/sda5' to turn journaling back on > * re-mount the filesystems > > It seems (from the man page for e2fsadm) that lvreduce/lvextend would > then not be needed. Is this true? > > I would like to feel more confident that this would actually work before > I jump in there and do it because I don't feel like looking for a new job if > it doesn't. ;-) > > Thanks, > > -Howard > > > -----Original Message----- > From: linux-lvm-bounces@redhat.com [mailto:linux-lvm-bounces@redhat.com] On > Behalf Of Chris Osicki > Sent: Wednesday, August 31, 2005 4:28 PM > To: LVM general discussion and development > Subject: Re: Moving space between logical volumes? > > > 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@uiowa.edu > > ITS - SPA, Unix Systems Group 319-335-5519 > > The University of Iowa Iowa City, IA > > > > > > > > > _______________________________________________ > > linux-lvm mailing list > > linux-lvm@redhat.com > > https://www.redhat.com/mailman/listinfo/linux-lvm > > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ > > -- > > Chris Osicki osk@osk.ch > Dipl. Informatik-Ing. HTL > > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
