Re: [linux-lvm] Repair inconsistent PV

[Andreas Pakulat <ap125@informatik.uni-rostock.de>]

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On 16.Aug 2003 - 17:45:56, Andreas Pakulat wrote:
> Hi,
> 
> yesterday I lost my / partition due to hardware problem. Now to reinstall
> the system I had to reduce the size of my VG, i did that using the
> KNOPPIX CD and first all went Ok. But during the Removal of one LV one
> harddisk "crashed", had several read errors. I could fix this, as It was
> due to a broken connection to the drive. But now the PV that was on that
> drive is inconsisten:
> 
> root@tty2[/]# vgscan
> vgscan -- reading all physical volumes (this may take a while...)
> vgscan -- found inactive volume group "vgmatrix"
> vgscan -- ERROR "pv_check_consistency_all_pv(): PE" volume group
> "vgmatrix" is inconsistent
> vgscan -- ERROR: unable to do a backup of volume group "vgmatrix"
> vgscan -- ERROR "lvm_tab_vg_remove(): unlink" removing volume group
> "vgmatrix" from "/etc/lvmtab"
> vgscan -- "/etc/lvmtab" and "/etc/lvmtab.d" successfully created
> vgscan -- WARNING: This program does not do a VGDA backup of your volume
> group
> root@tty2[/]#
> 
> If i do a pvcreate -ff /dev/hdc2 the inconsistency is gone, but also the
> metadata and as my / is also gone, I have no backup of the
> Metadata. So the Question is, can I somehow repair the PV Metadata or am
> I lost? It is also hard for me at the moment to get a Kernel with
> device-mapper support, so using LVM2 is only the last option for me.
> 
> Please say if you need any additional Information, here is pvdisplay 
> of the problematic PV:
> 
> root@tty2[/]# pvdisplay -v /dev/hdc2
> --- Physical volume ---
> PV Name               /dev/hdc2
> VG Name               vgmatrix
> PV Size               5.84 GB [12241530 secs] / NOT usable 4.19 MB [LVM:
> 133 KB]
> PV#                   2
> PV Status             available
> Allocatable           NO
> Cur LV                2
> PE Size (KByte)       4096
> Total PE              1493
> Free PE               444
> Allocated PE          1049
> PV UUID               v7FOLU-uCS4-ZD8R-2z6S-GIKR-RCbf-RI2Nax

I now installed a 2.6.0-test2 Kernel and tried to get further using
lvm2. From that I know that the VG Metadata differs between the PV on
hdc2 and the PV on hda7. I also experimented with the Partial-Option but
the LV I need cannot be mounted ;( Is there a way to create the
VG-Metadata of one PV from the Data on the other? How? I could create a
text-file using vgcfgbackup from lvm2, the interesting thing is that it
contains the PV-Data from hdc2, but I think that is the PV with the
wrong Information. Anyway I hope someone here can help me soon.

Andreas

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		-- Dali

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