On Sat, Nov 01, 2003 at 07:07:53PM +1200, Tom Parker wrote: > Hi, > > I have just experianced a rather nasty bug in lvextend. I grew a logical > volume and it used extents that were already in use for another logical > volume. You're the first reporting. Do you have abn archive copy in /etc/lvmconf representing that situation still ? If so, send it to me please <mge@sistina.com>. > > I'm using Debian Woody and Linux 2.4.22 (unpatched Linus kernel.org sources) > > amislave:/# lvextend --help > > Logical Volume Manager 1.0.4 > Heinz Mauelshagen, Sistina Software 02/05/2002 (IOP 10) > > Luckily I noticed the corrupting filesystems fairly quickly and was able to > mostly recover the situation with minimal losses. Currently I still have the > two overlapping logical volumes and a lot less trust in the LVM than I had > before. > > Is there a program that can validate the logical volume configuration and > ensure that no physical extent is allocated to more the one logical volume? vgck > > When extending a logical volume, or creating a new one, is anything written to > the newly allocated extents? While extending, the answer is no. If creating, the answer is ye, unless you "lvcreate -Zn ...". > If this were to happen again, and I discovered > the problem before I made use of the extra space or a new logical volume, > would I have any corruption of the first logical volume to use the extents in > question? As said, use "lvcreate -Zn ..." in order to avoid writing zerores to the first KB of the new LV (this is necessary because fs mounts can crash your system otherwise on an un'fscked LV). > > To finish my data recovery, I would like to allocate another large logical > volume, I'm somewhat wary of doing this without a tool to ensure that the > group is valid. Do an "lvcreate -Zn ...", run vgck and check the "lvdisplay -v ..." output on all your LVs if there's any overlaps again. If so, that's the archive copy you want to send to me. > > -- > Tom Parker - tom@carrott.org > - http://www.carrott.org > > > _______________________________________________ > linux-lvm mailing list > linux-lvm@sistina.com > http://lists.sistina.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ -- Regards, Heinz -- The LVM Guy -- *** Software bugs are stupid. Nevertheless it needs not so stupid people to solve them *** =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Heinz Mauelshagen Sistina Software Inc. Senior Consultant/Developer Am Sonnenhang 11 56242 Marienrachdorf Germany Mauelshagen@Sistina.com +49 2626 141200 FAX 924446 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- _______________________________________________ linux-lvm mailing list linux-lvm@sistina.com http://lists.sistina.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
