I have no idea if this is the way to do this officially but this worked for me. I had three partitions slash, usr and var on lvm vgs made on three software raid devices. I wanted to remove lvm 1 so I could try the 2.6 kernel - I guess I could have upgraded lvm but that seemed like more effort. What I did was: backup each partition. Then for each partition, make a new partition on a spare disk, mke2fs it, copy the data into it and change fstab to pick up the new location. Reboot. The old vg is still picked up by vgscan and I could not get rid of them with lvremove/vgremove because it moaned that they were in use. However, then for each one in turn I did mke2fs on the filing system and then deleted /etc/lvmtab and rebooted. When the machine came up if then lost that pv,vg,lv. Although I didn't try this, one thing I thought of was that you could delete /etc/lvmtab and edit the linuxrc script in /boot/initrd.img so that it didn't run vgchange -ay and so on on boot. You would then be able to get rid of stuff at your leisure without lvremove complaining stuff was in use. On Fri, 2003-12-05 at 02:42, Nathan Fredrickson wrote: > Hi, > I have browsed the archives and not found a conclusive answer to this: > How much of an PV partition do I need to wipe with dd so that pvscan > does not find it? > > I have found that even if I wipe a partition table with dd and then > repartition with the same sized partitions, the old PV and VG are still > found. I tried zeroing the start of the LVM partition, but found this > only worked consistently if I wiped nearly the entire partition. Where > exactly is the metadata that needs to be zeroed? > > I'd like to to wipe it regardless of any information about previous LVM > configuration. This is for install scripts of cluster nodes which are > re-imaged periodically. I'm using LVM 1.0.3. > > Thanks, > Nathan > > > _______________________________________________ > 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/ -- Geoff Dolman JDRF/WT Diabetes and Inflammation Laboratory Cambridge Institute for Medical Research University of Cambridge http://www-gene.cimr.cam.ac.uk/todd/ _______________________________________________ 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/
