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[linux-lvm] PVs that are reused / reformatted as filesystems



Hi there,

I have a system on which a partition that was once a PV was recycled as
a filesystem.  Now, it has a valid ext3 filesystem on it, but also the
PV signature appears to be there.  So I can't start things up without
liberal use of -P, and I can't seem to get anything except read-only
operation.

IMHO The utilities should probably never try to treat any in-use kernel
object as candidate for any kind of scanning or new use.  ie, the
userland equivalent of checking dev->kobj.kref.refcount == 0

Could someone please give me a fish (tell me how to un-jam my LVM) and
maybe even teach the LVM drivers/utilities to fish as well?

Here's the command output;

samv:~# lvmdiskscan -v
/dev/hda1 [ 13.98 GB] LVM physical volume
/dev/hda2 [ 65.13 GB] LVM physical volume
/dev/hda3 [ 13.97 GB] LVM physical volume
/dev/hda4 [ 1.00 KB]
/dev/hda5 [ 1004.03 MB]
/dev/hda6 [ 17.72 GB] LVM physical volume
0 disks
2 partitions
0 LVM physical volume whole disks
4 LVM physical volumes
samv:~# mount | grep hda
/dev/hda3 on / type ext2 (rw,errors=remount-ro)
samv:~# vgchange -ay
Failed to read VG data from PV (/dev/hda3)
Failed to read VG data from PV (/dev/hda3)
Unable to find volume group "Mirror"
Couldn't find device with uuid 'PtbIxo-EmRo-ML7J-yhqx-gglD-ZayH-X6tuWE'.
Couldn't find all physical volumes for volume group samv.
Couldn't find device with uuid 'PtbIxo-EmRo-ML7J-yhqx-gglD-ZayH-X6tuWE'.
Couldn't find all physical volumes for volume group samv.
Unable to find volume group "samv"
samv:~# vgscan -P
Partial mode. Incomplete volume groups will be activated read-only.
Reading all physical volumes. This may take a while...
Failed to read VG data from PV (/dev/hda3)
Failed to read VG data from PV (/dev/hda3)
Volume group "Mirror" not found
Couldn't find device with uuid 'PtbIxo-EmRo-ML7J-yhqx-gglD-ZayH-X6tuWE'.
Couldn't find device with uuid 'PtbIxo-EmRo-ML7J-yhqx-gglD-ZayH-X6tuWE'.
Found volume group "samv" using metadata type lvm2
samv:~# vgchange -ay -P
Partial mode. Incomplete volume groups will be activated read-only.
Failed to read VG data from PV (/dev/hda3)
Failed to read VG data from PV (/dev/hda3)
Unable to find volume group "Mirror"
Couldn't find device with uuid 'PtbIxo-EmRo-ML7J-yhqx-gglD-ZayH-X6tuWE'.
Couldn't find device with uuid 'PtbIxo-EmRo-ML7J-yhqx-gglD-ZayH-X6tuWE'.
Couldn't find device with uuid 'PtbIxo-EmRo-ML7J-yhqx-gglD-ZayH-X6tuWE'.
Couldn't find device with uuid 'PtbIxo-EmRo-ML7J-yhqx-gglD-ZayH-X6tuWE'.
Couldn't find device with uuid 'PtbIxo-EmRo-ML7J-yhqx-gglD-ZayH-X6tuWE'.
Couldn't find device with uuid 'PtbIxo-EmRo-ML7J-yhqx-gglD-ZayH-X6tuWE'.
Couldn't find device with uuid 'PtbIxo-EmRo-ML7J-yhqx-gglD-ZayH-X6tuWE'.
Couldn't find device with uuid 'PtbIxo-EmRo-ML7J-yhqx-gglD-ZayH-X6tuWE'.
Couldn't find device with uuid 'PtbIxo-EmRo-ML7J-yhqx-gglD-ZayH-X6tuWE'.
Couldn't find device with uuid 'PtbIxo-EmRo-ML7J-yhqx-gglD-ZayH-X6tuWE'.
Couldn't find device with uuid 'PtbIxo-EmRo-ML7J-yhqx-gglD-ZayH-X6tuWE'.
Couldn't find device with uuid 'PtbIxo-EmRo-ML7J-yhqx-gglD-ZayH-X6tuWE'.
5 logical volume(s) in volume group "samv" now active
samv:~# mount /export/media
mount: block device /dev/mapper/samv-media is write-protected, mounting read-only
samv:~#


--
Sam Vilain, sam /\T vilain |><>T net, PGP key ID: 0x05B52F13
(include my PGP key ID in personal replies to avoid spam filtering)


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