[linux-lvm] missing vg after reboot

[Michael Holschbach]

--- "Heinz J . Mauelshagen" <mauelshagen at sistina.com> wrote:
> 
> Michael,
> 
> the pvdata output below exposes a completely messy PV structure,
> which makes me think of 2 possible reasons:
> 
> a. /dev/hda2 is not the device you used to create a physical volume
> 
> b. something accidentially overwrote /dev/hda2 after the PV creation
> 
> 
> If b is true you might still have an actual VGDA backup in
> /etc/lvmconf/ which
> you can use to vgcfgrestore(8) it to /dev/hda2 presumed that
> /dev/hda2 is
> the right device.
> 
I already tried vgcfgrestore. All available backup files lead to the
same result:
 
> > server1:~ # vgcfgrestore -v -n data /dev/hda2
> > vgcfgrestore -- locking logical volume manager
> > vgcfgrestore -- restoring volume group "data" from
> > "/etc/lvmconf/data.conf"
> > vgcfgrestore -- checking existence of
> > "/etc/lvmconf/data.conf"
> > vgcfgrestore -- reading volume group data for "data"
> > from "/etc/lvmconf/data.con
> > f"
> > vgcfgrestore -- reading physical volume data for
> > "data" from "/etc/lvmconf/data.
> > conf"
> > vgcfgrestore -- reading logical volume data for "data"
> > from "/etc/lvmconf/data.c
> > onf"
> > vgcfgrestore -- checking volume group consistency of
> > "data"
> > vgcfgrestore -- checking volume group consistency of
> > "data"
> > vgcfgrestore -- reading physical volume "/dev/hda2"
> > vgcfgrestore -- ERROR "pv_read(): PV identifier
> > invalid" reading physical volume
> >  "/dev/hda2"
> > 
My idea was to reset the values of /dev/hda2 according to the following
settings:

> > server1:~ # vgcfgrestore -v -ll -n data /dev/hda2
...
> > --- Physical volume ---
> > PV Name               /dev/hda2
> > VG Name               data
> > PV Size               27.62 GB / NOT usable 2.48 MB
> > [LVM: 148 KB]
> > PV#                   2
> > PV Status             available
> > Allocatable           yes
> > Cur LV                6
> > PE Size (KByte)       4096
> > Total PE              7069
> > Free PE               669
> > Allocated PE          6400
> > PV UUID              
> > e7sX5R-XnTm-keX6-jShf-tTlw-DUP3-mzp4zW
> > 

These values seem plausible for me. Can i use them to manually edit the
PV /dev/hda2 to rescue some data? 


MfG Michael

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