[linux-lvm] LV recovery

[Lawrence Strydom]

Thanks for the help Heinz. I actually managed to get it going with a bit
of a long-winded route though. I installed the SuSE email server III
software on another machine and configured it with a small VG to make
sure the modules are all there. Then I removed hdc from the broken
machine, put in the new machine and ran vgscan again. Vgscan correctly 
identified my LV and created /etc/lvmtab and /etc/lvmtab.d. After that
it was a simple matter of editting /etc/fstab to mount /var on
/dev/system/VAR. 

Once again, thanks for the effort :-)

Lawrence


On Mon, 2002-12-09 at 19:54, Heinz J . Mauelshagen wrote:
> On Mon, Dec 09, 2002 at 05:33:58PM +0200, Lawrence Strydom wrote:
> > Hi Heinz,
> > I get the following output:
> > insmod: /lib/modules/2.4.7-4GB/kernel/drivers/md/lvm-mod.o: insmod
> > char-major-109 failed.
> > 
> > vgscan --  LVM driver module not loaded
> > 
> > That freaks me out a bit because the module is present. When I try to
> > load it manually with insmod I get the same error. Does this mean the
> > metadata has been overwritten?
> 
> No, it does only mean that insmod fails loading the lvm modules which is
> likely caused by the depmod problem not being able to write the module
> dependency file. Is your root filesystem full ? In that case you need to
> free some space there in order to run "depmod -a" fine.
> If you didn't boot the Linux version you want to create the module dependency
> file(s) for, you may need "depmod -F System.map -a Linuxversion".
> 
> If the modules can't be loaded or the LVM driver is not statically
> bound into your kernel, you can't activate any volume groups and therefore
> can't access any logical volumes :(
> 
> BTW: You are using a rather old version of the 2.4 kernel and likely of LVM too.
>      Is there a chance that you can upgrade ?
> 
> Regards,
> Heinz    -- The LVM Guy --
> 
> > 
> > Thanks
> > Lawrence
> > 
> > On Mon, 2002-12-09 at 15:30, Heinz J . Mauelshagen wrote:
> > > 
> > > Lawrence,
> > > 
> > > vgscan should recognize your VG fine if nothing overwrote the LVM metadata
> > > on /dev/hdc.
> > > What does vgscan dispay ?
> > > 
> > > On Mon, Dec 09, 2002 at 02:45:36PM +0200, Lawrence Strydom wrote:
> > > > Hi,
> > > > My company uses a SuSE email server III solution. The box has 2 IDE
> > > > drives, hda with /boot, /, and swap partintions on. The second, hdc, was
> > > > placed in a LVG with a LV for /var occupying all availlable space.
> > > > While I was away (quick absolution of self) one of the junior guys did
> > > > an online update of the software after which the system wouldn't start
> > > > again. To make a long story short, I managed to get the system going
> > > > again BUT..... /var cannot be mounted. 
> > > > /etc/fstab points to /dev/system/VAR. Upon inspection, this binary file
> > > > turns out to contain nothing but an error message about being unable to
> > > > write to /lib/modules/2.4.18-nnnnn/modules.dep. Ooops...
> > > > Now my question is this: Is it possible to recover the data from the
> > > > /var LV if the /dev/system/VAR file has gone AWOL? 
> > > > Any pointers to documentation/tools will be very much appreciated.
> > > > 
> > > > Thanks,
> > > > Lawrence
> > > > 
> > > > 
> > > > 
> > > > 
> > > > _______________________________________________
> > > > linux-lvm mailing list
> > > > linux-lvm at sistina.com
> > > > http://lists.sistina.com/mailman/listinfo/linux-lvm
> > > > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
> > > 
> > > -- 
> > > 
> > > Regards,
> > > Heinz    -- The LVM Guy --
> > > 
> > > *** 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
> > > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> > > 
> > > _______________________________________________
> > > linux-lvm mailing list
> > > linux-lvm at sistina.com
> > > http://lists.sistina.com/mailman/listinfo/linux-lvm
> > > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
> > 
> > 
> > 
> > _______________________________________________
> > linux-lvm mailing list
> > linux-lvm at sistina.com
> > http://lists.sistina.com/mailman/listinfo/linux-lvm
> > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
> 
> *** 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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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/