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Re: [linux-lvm] Severe problem: data lost while adding a partition



Heinz, all,

I really appreciate your help in this. However, I am rather reluctant to dive in and be hasty in my commands. I really don't want to destroy my data....
As I understand it, pvcreate -ff would re-initialize the physical volume. As I understand it, I will have to add them to a volume group again. But will the filesystem still be intact after that then?


Sorry if this sound like a beginner question to you. It very well might be, but I'd rather be careful....

Best regards,

Sander

Sander,

if you want to redo from scratch, "pvcreate -ff" the disks/partitions
you want to use with LVM. Partitions need to have type 0x8E (Linux LVM).


Regards, Heinz -- The LVM Guy --


On Thu, Feb 06, 2003 at 10:48:27PM +0100, Sander Alberink wrote:


Heinz,

Thanks for your reply, but I have some more questions....



can you tell what you mean with
'...something went horribly wron during install...' ?

Any particular messages which can help analyzing this ?




Well, actually no real error messages, just a GUI installer that didn't do what I expected it to do. However, the LVM was hosed already at the time I realized something was wrong



If you don't have any, take your most recent LVM metedata from the archive (/etc/lvconf/ ; you've got a backup, right ?), figure out disks used as PVs
with "vgcfgrestore -ll ..." and run "pvcreate -ff ..." and vgcfgresto
on all of them. The archive you use shall _not_ include the recently added
disk.




Well, guess what? The LVM used in Mandrake doesn't make a backup copy. And of course I hadn't executed it myself.... So as such I cannot restore the exact configuration. Is pvcreate still the way to go then? Please advice!

Best regards,

Sander



Regards,
Heinz    -- The LVM Guy --


On Sun, Feb 02, 2003 at 01:14:28AM +0100, Sander Alberink wrote:





Hello all,

I write to you with a rather grave problem. I have a small LVM setup at home, consisting of 4 partitions. These were created by the Mandrake 8.2 installation system. After deciding to upgrade the system to Mandrake 9.0, I found out that I had another partition lying around which was also prepared for LVM use. I had meant for that disc to use later on in a different scheme for my /usr partition but never got around to do it.
However, during installation I decided to add it to the LVM. The idea was that I would extend the FS later (of course, I was not going to involve this LVM setup in the rest of the installation, I would do all that manually.)


But as you probably guessed, something went horribly wrong during install time and my LVM setup is properly hosed. I wanted to re-create the setup, but alas: I forgot which was the disk that I added.

The name of the LV (there was only 1) was home, the disks involved were /dev/hda1, /dev/hda[4-6].

Output of pvscan:
----------------------------------------------------------------------
pvscan -- reading all physical volumes (this may take a while...)
pvscan -- walking through all physical volumes found
pvscan -- inactive PV "/dev/ide/host0/bus0/target0/lun0/part1" is associated to an unknown VG (run vgscan)
pvscan -- inactive PV "/dev/ide/host0/bus0/target0/lun0/part4" is associated to an unknown VG (run vgscan)
pvscan -- inactive PV "/dev/ide/host0/bus0/target0/lun0/part5" is associated to an unknown VG (run vgscan)
pvscan -- inactive PV "/dev/ide/host0/bus0/target0/lun0/part6" is associated to an unknown VG (run vgscan)
pvscan -- inactive PV "/dev/ide/host0/bus0/target0/lun0/part7" is associated to an unknown VG (run vgscan)
pvscan -- total: 5 [1.97 GB] / in use: 5 [1.97 GB] / in no VG: 0 [0]


-----------------------------------------------------------------------

output of vgscan:
-----------------------------------------------------------------------
vgscan -- reading all physical volumes (this may take a while...)
vgscan -- "/etc/lvmtab" and "/etc/lvmtab.d" successfully created
vgscan -- WARNING: This program does not do a VGDA backup of your volume group


-----------------------------------------------------------------------

output of pvdisplay /dev/hda1 (this partition belonged to the LV for sure)
-----------------------------------------------------------------------
pvdisplay -- getting physical volume size
--- Physical volume ---
PV Name               /dev/ide/host0/bus0/target0/lun0/part1
VG Name               home
PV Size               399.62 MB / NOT usable 3.62 MB [LVM: 121.00 KB]
PV#                   1
PV Status             NOT available
Allocatable           yes (but full)
Cur LV                1
PE Size (KByte)       4096
Total PE              99
Free PE               0
Allocated PE          99
PV UUID               NCf9U6-nqVy-zn3K-upFo-S0PB-SFqb-o2ERjs
-----------------------------------------------------------------------

If you need any further information, please let me know!
I do hope you can help me with this, since I stand to loose a lot of personal data, of which exists no backup (of course, you guys probably hear this all the time).


Best regards,

Sander Alberink







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