[linux-lvm] Data on LVM-Partition, how to read it out

[linux-lvm] Data on LVM-Partition, how to read it out

[Alexander Bruns]

Hi,

I try to get an Answer to my Problem once more. Someone Told me that i
Have the "bug 193 in bugzilla". But how do I handle the Bug? How can I
Read the data out of the partition?


I had the following things running for a short while:

- RedHat 7.1 with all updates.
- self-compiled Kernel 2.4.6 with patched lvm 0.9.1_beta7

On my first HD Igave the rest space to hda7 with fdisk and set the
partition to "8e" lvm.

The I followed the howto at sistina at:
file://sistina.com/lvm/doc/lvm_howto/Common_tasks.html


- I initalized the Partition:
  pvcreate /dev/hda7

- I added the partition to a new volume group:
  vgcreate lvm_volume_01 /dev(hda7

- then o activated the volume group:
  vgchange -a y lvm_volume_01

- The I put a logical volume on the volume group:
  lvcrate -L50G -nlvm_lv_01 lvm_volume_01

This logical Volume was then at /dev/lvm_volume_01/lvm_lv_01 and o
formated it woith reiserfs an mounted it! Evething runs fine.

I copied the old contents of hdb5 and hdc5 of the smaller HDs to this
logical volume. on hda7.

Then I added deleted the partition on hdc5, made a new one, set it to
8e an added it to the volume group as explained at:
file://sistina.com/lvm/doc/lvm_howto/Common_tasks.html

pvcreate /dev/hdc5
vgextend lvm_volume_01
lvextend -L30G /dev/lvm_volume_01/lvm_lv_01
resize_reiserfs -f /dev/lvm_volume_01/lvm_lv_01

That was all fine and i could mount the lvm_lv_01 without any
problems.

The same I then wanted to manage with the thirt HD at hdb5, but then
something went wrong??

Resize reiserfs did something but when i wanted to mount the LV it did
not work. reiserfs-checks did not found a problem but the mount-binary
told my something about a superblock......


Abter a reboot I now have the following:

[root@holodeck lvmconf]# pvdisplay /dev/hda7
pvdisplay
--- Physical volume ---
PV Name               /dev/hda7
VG Name               lvm_volume_01
PV Size               48.54 GB / NOT usable 1.06 MB [LVM: 169 KB]
PV#                   1
PV Status             available
Allocatable           yes (but full)
Cur LV                1
PE Size (KByte)       4096
Total PE              12425
Free PE               0
Allocated PE          12425
PV UUID               cFFBJX-aqxr-P7kU-71OY-pgpX-rvtA-XxVpoc

But for /dev/hdb5 and /ev/hdc5 it does not show the same. NOTHING!!

And becouse I did not write anything to the volumegroup or logical
volume after the added two partition al my data must still be on hda7.
But how do I manage to get on it?

SHIT!

How do I get on my Data at lvm_volume_01 bzw lvm_lv_01.
lvm_lv_01 was formated with reiserfs

Greetings from Germany from Alex

Re: [linux-lvm] Data on LVM-Partition, how to read it out

[Joe Thornber]

On Sat, Aug 18, 2001 at 02:05:26PM +0200, Alexander Bruns wrote:
> Resize reiserfs did something but when i wanted to mount the LV it did
> not work. reiserfs-checks did not found a problem but the mount-binary
> told my something about a superblock......
> 
> 
> Abter a reboot I now have the following:
> 
> [root@holodeck lvmconf]# pvdisplay /dev/hda7
> pvdisplay
> --- Physical volume ---
> PV Name               /dev/hda7
> VG Name               lvm_volume_01
> PV Size               48.54 GB / NOT usable 1.06 MB [LVM: 169 KB]
> PV#                   1
> PV Status             available
> Allocatable           yes (but full)
> Cur LV                1
> PE Size (KByte)       4096
> Total PE              12425
> Free PE               0
> Allocated PE          12425
> PV UUID               cFFBJX-aqxr-P7kU-71OY-pgpX-rvtA-XxVpoc
> 
> But for /dev/hdb5 and /ev/hdc5 it does not show the same. NOTHING!!

It looks like you've managed to write over the metadata on the start
of /dev/hdb5 and /dev/hdc5.  You can confirm this by using the pvdata
command.  If you have then you will need to restore the metadata from
a backup, look at vg_cfgrestore.

- Joe

Re: [linux-lvm] Data on LVM-Partition, how to read it out

[Heinz J . Mauelshagen]

On Sat, Aug 18, 2001 at 01:33:06PM +0100, Joe Thornber wrote:
> On Sat, Aug 18, 2001 at 02:05:26PM +0200, Alexander Bruns wrote:
> > Resize reiserfs did something but when i wanted to mount the LV it did
> > not work. reiserfs-checks did not found a problem but the mount-binary
> > told my something about a superblock......
> > 
> > 
> > Abter a reboot I now have the following:
> > 
> > [root@holodeck lvmconf]# pvdisplay /dev/hda7
> > pvdisplay
> > --- Physical volume ---
> > PV Name               /dev/hda7
> > VG Name               lvm_volume_01
> > PV Size               48.54 GB / NOT usable 1.06 MB [LVM: 169 KB]
> > PV#                   1
> > PV Status             available
> > Allocatable           yes (but full)
> > Cur LV                1
> > PE Size (KByte)       4096
> > Total PE              12425
> > Free PE               0
> > Allocated PE          12425
> > PV UUID               cFFBJX-aqxr-P7kU-71OY-pgpX-rvtA-XxVpoc
> > 
> > But for /dev/hdb5 and /ev/hdc5 it does not show the same. NOTHING!!
> 
> It looks like you've managed to write over the metadata on the start
> of /dev/hdb5 and /dev/hdc5.  You can confirm this by using the pvdata
> command.  If you have then you will need to restore the metadata from
> a backup, look at vg_cfgrestore.

Small typo here: Joe's refering to vgcfgrestore(8).

> 
> - Joe
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html

-- 

Regards,
Heinz    -- The LVM Guy --

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***

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Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen@Sistina.com                           +49 2626 141200
                                                       FAX 924446
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