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[linux-lvm] lost VG after some rearranging (help needed)

Hello all,

I've lost access to my root on LVM system and hope that with some help of readers of this list can recover from this.

Up until yesterday I had a system with 2 VG:

 "vg" on partition 3 of primary drive
 "titan_vg" on whole secondary drive

"vg" contains LVs: "titan_vg" contains LVs:
/dev/vg/home /dev/titan_vg/hugepart /dev/vg/usr /dev/titan_vg/biggerpart
/dev/vg/var /dev/titan_vg/largepart /dev/vg/tmp /dev/vg/bigpart

Yesterday afternoon I started to re-arange (deactivating and
unmounting where needed):

lvremove /dev/titan_vg/biggerpart
lvremove /dev/titan_vg/largepart

cp -av /dev/vg/hugepart/* /dev/titan_vg/hugepart/vg_hugepart/

lvremove /dev/vg/hugepart

vgmerge vg titan_vg

 lvextend -L+4000M /dev/vg/home
 ext2resize /dev/vg/home

 lvextend -L+4000M /dev/vg/bigpart
 ext2resize /dev/vg/bigpart

mv /dev/vg/hugepart/vg_hugepart/* /dev/vg/hugepart/

So far everything works fine. No problems. The I noticed that
/dev/vg/usr has no more capacity. Now this cannot be resized just like that because it is in use. So I decide to prepare for a single user reboot without mounting /dev/vg/usr. The idea being that I can then resize this LV and the reboot again in multiuser mode.

However when rebooting Linux does not find the root LV! vgscan reports
it cannot find any VGs!

I have an emergency system on /dev/hda2 which is not LVM dependant. So
I boot into this partition. I've had some LVM troubles in the past and
used this emergency system to recover. On this partition I have some old
config files which contain old configuration info which has been used
in the past recover form similar trouble.

However these config files are not up to date due to the changes of
the past months. Some basics (like /dev/vg/root) however have not
changed and I was hoping (as was the case before) to do a vgcfgrestore
and at least get a bootable root_on_LVM system back. From there, do
another vgcfgrestore using more recent config files available on the
root_on_LVM system and thus get the most recent and uptodate
configuration back.

So I restored a previous configuration but alas,.. not with the hoped

Can anyone advise me how to preceed from here?

Thanks in advance!

Jan Rhebergen

PS: Here is some informative output:

titan:/etc/lvmconf# pvscan
pvscan -- reading all physical volumes (this may take a while...)
pvscan -- inactive PV "/dev/ide/host0/bus0/target0/lun0/part3" is associated to unknown VG "vg" (run vgscan)
pvscan -- inactive PV "/dev/ide/host0/bus0/target1/lun0/disc" is associated to unknown VG "vg" (run vgscan)
pvscan -- total: 2 [149.77 GB] / in use: 2 [149.77 GB] / in no VG: 0 [0]

titan:/etc/lvmconf# lvm vgscan
 Reading all physical volumes.  This may take a while...
 VG data differs between PVs /dev/hda3 and /dev/hdb
 Volume group "vg" not found

titan:/etc/lvmconf# pvdata /dev/hdb
--- Physical volume ---
PV Name /dev/hdb
VG Name vg
PV Size 111.79 GB [234441648 secs] / NOT usable 32.19 MB [LVM: 137 KB]
PV# 2
PV Status NOT available
Allocatable yes
Cur LV 1
PE Size (KByte) 32768
Total PE 3576
Free PE 528
Allocated PE 3048
PV UUID r5BNbe-7xyz-SS53-89Vw-cHf0-wkGM-uChV9B

--- Volume group ---
VG Name VG Access read/write
VG Status NOT available/resizable
VG # 1
MAX LV 256
Cur LV 9
Open LV 0
MAX LV Size 2 TB
Max PV 256
Cur PV 2
Act PV 1
VG Size 149.69 GB
PE Size 32 MB
Total PE 4790
Alloc PE / Size 4015 / 125.47 GB
Free PE / Size 775 / 24.22 GB
VG UUID IqNxPQ-yO6B-d3qf-xZ6d-hFYD-fXNq-98dYNQ

--- List of logical volumes ---

pvdata -- logical volume struct at offset   0 is empty
pvdata -- logical volume struct at offset   1 is empty
pvdata -- logical volume "/dev/titan/hugepart" at offset   2

pvdata -- logical volume struct at offset 254 is empty
pvdata -- logical volume struct at offset 255 is empty
--- List of physical volume UUIDs ---

001: E2IXqI-x6Dr-NIBk-EnhJ-UZt8-gcTn-n0YCoG
002: r5BNbe-7xyz-SS53-89Vw-cHf0-wkGM-uChV9B

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