Comment 20 for bug 452350

iMac (imac-netstatz) wrote :

pvremove could not find the device in my case. It said "Couldn't find device. Check your filters?" with -ff and "Physical Volume /dev/sda5 note found" without -ff. pvck and pvscan were of no use identifying the label, however I knew that I had moved LVM from /dev/sda5 to /dev/sda6 using the alternate installer (similar to comments above).

I found this post below and was able to see the label myself.
http://www.redhat.com/archives/linux-lvm/2008-February/msg00011.html

dd if=/dev/sda5 bs=1k count=1 | hexdump -e '"%_p"'

so there it is. but when I use pvremove -vvvv /dev/sda5 I can see the "Skipping md component device" rule being applied. How do I turn this off??

Interestingly, I have another device that is a raid device, that has LVM on it, and it looks the same, so I get how grub2 is getting confused.

The solution was to turn md detection off in /etc/lvm/lvm.conf and re-run the pvremove command. The labels were "successfully wiped".