[linux-lvm] one PV crashed
Heinz J . Mauelshagen
mauelshagen at sistina.com
Fri Feb 1 04:16:03 UTC 2002
On Fri, Feb 01, 2002 at 11:01:22AM +0100, Turbo Fredriksson wrote:
> I have (had) 6 PV's in my VG. The last one crashed (the whole disk
> seems to have broken totaly).
>
> It don't seem possible to restore the information (not without spending
> $$$ to a data recovery company), so how do I get the data stored on the
> OTHER disks?
You don't spend a single dollar :-)
There's 2 solutions:
A:
--
Buy a replacemeent drive (say /dev/sdg1 ;-) and run
fdisk # to partition it the same way the broken one was
pvcreate /dev/sdg1
vgcfgrestore -f /etc/lvmconf/vg1.conf -n vg1 /dev/sdg1
vgscan
B:
--
If you don't have a replacement drive at hand you can even be faster by
faking one (you must have loop configured in the kernel and use LVM 1.0.2):
dd if=/dev/zero of=/tmp/my_sdg1.vgda bs=1k count=512
losetup /dev/loop0 /tmp/my_sdg1.vgda
pvcreate /dev/loop0
vgcfgrestore -f /etc/lvmconf/vg1.conf -n vg1 /devloop0
vgscan
After either of the above aproaches you need to lvreduce/lvremove those
LVs which had extents allocated on the failed drive.
You can figure out which those are by
pvdisplay -v /dev/sdg1
- or -
pvdisplay -v /dev/loop0
respectively.
If you had a replacement drive (case A), you can continue to use it because
it will jsut be an empty PV which belonngs to your VG after the
lvreduce/lvremove runs recommended above.
If you used the loop0 fake (case B) run
vgreduce vg1 /dev/loop0
losetup -d /dev/loop0
rm /tmp/my_sdg1.vgda
Hope that helps :-)
Regards,
Heinz -- The LVM Guy --
>
>
> [papadoc.root]# pvscan -u
> pvscan -- reading all physical volumes (this may take a while...)
> pvscan -- inactive PV "/dev/sdb1 " with UUID "ofZCeT-O16H-Df0h-4KoB-xQhm-lc24-67dZvk" of VG "vg1" [5.87 GB / 0 free]
> pvscan -- inactive PV "/dev/sdc1 " with UUID "xN0MF7-xKU0-Uk3L-g8Pw-0YfH-fS3V-zgFA66" of VG "vg1" [1004.00 MB / 0 free]
> pvscan -- inactive PV "/dev/sdd10" with UUID "5V0XNB-gA87-OU66-1iza-cvsz-xQ2q-6DEbyH" of VG "vg1" [2.37 GB / 0 free]
> pvscan -- inactive PV "/dev/sde1 " with UUID "Bdm7PX-50Dq-hC6R-yXmv-DDq1-n6Nx-4ohaKK" of VG "vg1" [8.50 GB / 0 free]
> pvscan -- inactive PV "/dev/sdf1 " with UUID "QnqfyA-fOTB-J1Pp-4be5-t6QU-bGjS-i2BKf2" of VG "vg1" [17.09 GB / 0 free]
> pvscan -- total: 5 [34.84 GB] / in use: 5 [34.84 GB] / in no VG: 0 [0]
> [papadoc.root]# /etc/init.d/lvm start
> Setting up LVM Volume Groups...
> vgchange -- ERROR: physical volume "/dev/sdg1" of volume group "vg1" is offline
> vgchange -- run vgscan
> [papadoc.root]# 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
> [papadoc.root]# pvscan -u
> pvscan -- reading all physical volumes (this may take a while...)
> pvscan -- inactive PV "/dev/sdb1 " with UUID "ofZCeT-O16H-Df0h-4KoB-xQhm-lc24-67dZvk" is associated to an unknown VG (run vgscan)
> pvscan -- inactive PV "/dev/sdc1 " with UUID "xN0MF7-xKU0-Uk3L-g8Pw-0YfH-fS3V-zgFA66" is associated to an unknown VG (run vgscan)
> pvscan -- inactive PV "/dev/sdd10" with UUID "5V0XNB-gA87-OU66-1iza-cvsz-xQ2q-6DEbyH" is associated to an unknown VG (run vgscan)
> pvscan -- inactive PV "/dev/sde1 " with UUID "Bdm7PX-50Dq-hC6R-yXmv-DDq1-n6Nx-4ohaKK" is associated to an unknown VG (run vgscan)
> pvscan -- inactive PV "/dev/sdf1 " with UUID "QnqfyA-fOTB-J1Pp-4be5-t6QU-bGjS-i2BKf2" is associated to an unknown VG (run vgscan)
> pvscan -- total: 5 [34.84 GB] / in use: 5 [34.84 GB] / in no VG: 0 [0]
>
>
> This was the info the sg1 disk had:
> PV# PV Name VG Name PV UUID PV Size
> 6 /dev/sdg1 vg1 7x1CdK-50u6-NAmJ-6bHY-Ho09-U3hC-K7c18w 15.55 GB 0 free
>
> World Trade Center FSF spy Nazi terrorist supercomputer cryptographic
> toluene [Hello to all my fans in domestic surveillance] assassination
> counter-intelligence Ft. Bragg subway Rule Psix security
> [See http://www.aclu.org/echelonwatch/index.html for more about this]
>
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> read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
*** Software bugs are stupid.
Nevertheless it needs not so stupid people to solve them ***
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Heinz Mauelshagen Sistina Software Inc.
Senior Consultant/Developer Am Sonnenhang 11
56242 Marienrachdorf
Germany
Mauelshagen at Sistina.com +49 2626 141200
FAX 924446
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