Re: lvm 1.0.3 kernel panic

Stephanus Fengler <fengler@uiuc.edu> · Wed, 21 Jul 2004 03:32:48 -0500

Ok, finally I have managed it.

So if I am not too much mistaken following scenario happened:

I added the new hard disk  to volume group vg01 which contains my 
logical root partition.

Therefore the configuration file in /etc/lvmconf/vg01.conf and the 
runtime configuration /etc/lvmtab.d/vg01.tmp grew in size (from 1.5MB to 
2.6 MB).

But I did not rerun lvmcreate_initrd to increase the initial ramdisk 
size. During the boot process the ramdisk is used to load and/or create 
/etc/lvmtab.d/vg01.tmp.

But it did not fit anymore into the ramdisk. Therefore it stopped 
booting with the kernel panic. The same reason why the knoppix cd wasn't 
able to create it, but fortunately the redhat linux rescue cd.

Solution:
reboot with rescue cd,
vgscan
vgchange -a y
mount /dev/vg01/lv_root /mnt/sysimage
chroot /mnt/sysimage /bin/bash
lvremove /dev/vg01/lv_data
reboot

Rerun of lvmcreate_initrd in chroot environment did not work for me at 
least.

Anyway, I stopped using lvm on my system hence it is not really 
necessary but was preinstalled.

Well, thanks for let me figure that out by myself.
At least a statement if understood the behaviour correctly would be fine.

Thanks,
Stephanus

Stephanus Fengler wrote:

I got a knoppix rescue cd with lvm version 1.0.8 running now
and a sshd server to rescue my data. Problem is that this
version is not compatible with my volume group:

vgscan:

vgscan -- removing "/etc/lvmtab" and "/etc/lvmtab.d"
vgscan -- creating empty "/etc/lvmtab" and "/etc/lvmtab.d"
vgscan -- reading all physical volumes (this may take a while...)
vgscan -- scanning for all active volume group(s) first
vgscan -- reading data of volume group "vg01" from physical
volume(s)
vgscan -- found inactive volume group "vg01"
vgscan -- getting block device numbers for logical volumes

vgscan -- checking block device numbers of logical volumes

vgscan -- inserting "vg01" into lvmtab
vgscan -- backing up volume group "vg01"
vgscan -- checking volume group name "vg01"
vgscan -- checking volume group consistency of "vg01"
vgscan -- checking existence of "/etc/lvmtab.d"
vgscan -- storing volume group data of "vg01" in
"/etc/lvmtab.d/vg01.tmp"
vgscan -- storing physical volume data of "vg01" in
"/etc/lvmtab.d/vg01.tmp"
vgscan -- storing logical volume data of volume group "vg01"
in "/etc/lvmtab.d/vg01.tmp"
vgscan -- ERROR 2 writing volume group backup file
/etc/lvmtab.d/vg01.tmp in vg_cfgbackup.c [line 271]
vgscan -- ERROR: unable to do a backup of volume group "vg01"
vgscan -- ERROR "lvm_tab_vg_remove(): unlink" removing volume
group "vg01" 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

the error looks the same so I assume that something is
incompatible in my old system. I never changed lvm version as
far as I know of... but it might be possible.

Is there a way to access this volume group now?

Any help is really appreciated.

Stephanus

---- Original message ----

Date: Mon, 19 Jul 2004 16:46:31 -0500

From: Stephanus Fengler <fengler@uiuc.edu>  
Subject: Re:  lvm 1.0.3 kernel panic  
To: LVM general discussion and development <linux-lvm@redhat.com>

Here is additionally an output of:
vgcfgrestore -f /mnt/sysimage/etc/lvmconf/vg01.conf -n vg01 -ll

--- Volume group ---
VG Name               vg01
VG Access             read/write
VG Status             NOT available/resizable
VG #                  0
MAX LV                256
Cur LV                3
Open LV               0
MAX LV Size           255.99 GB
Max PV                256
Cur PV                4
Act PV                4
VG Size               501.92 GB
PE Size               4 MB
Total PE              128491
Alloc PE / Size       128491 / 501.92 GB
Free  PE / Size       0 / 0
VG UUID               vsZRhX-6bfh-jqhD-Cn1Z-0h9E-tiE6-isU7hJ

--- Logical volume ---
LV Name                /dev/vg01/lv_root
VG Name                vg01
LV Write Access        read/write
LV Status              available
LV #                   1
# open                 0
LV Size                33.66 GB
Current LE             8617
Allocated LE           8617
Allocation             next free
Read ahead sectors     10000
Block device           58:0

--- Logical volume ---
LV Name                /dev/vg01/lv_data2
VG Name                vg01
LV Write Access        read/write
LV Status              available
LV #                   2
# open                 0
LV Size                235.38 GB
Current LE             60257
Allocated LE           60257
Allocation             next free
Read ahead sectors     10000
Block device           58:1

--- Logical volume ---
LV Name                /dev/vg01/lv_data
VG Name                vg01
LV Write Access        read/write
LV Status              available
LV #                   3
# open                 0
LV Size                232.88 GB
Current LE             59617
Allocated LE           59617
Allocation             next free
Read ahead sectors     10000
Block device           58:2

--- Physical volume ---

PV Name               /dev/hda3

VG Name               vg01

PV Size               33.67 GB [70605675 secs] / NOT usable

4.19 MB 

[LVM: 161 KB]
PV#                   1
PV Status             available
Allocatable           yes (but full)
Cur LV                1
PE Size (KByte)       4096
Total PE              8617
Free PE               0
Allocated PE          8617
PV UUID               ouWY4f-vGwm-Rq3p-eX3M-tDaI-BQ3i-D7gT4f

--- Physical volume ---

PV Name               /dev/hda1

VG Name               vg01

PV Size               2.50 GB [5253192 secs] / NOT usable

4.19 MB [LVM: 

130 KB]
PV#                   2
PV Status             available
Allocatable           yes (but full)
Cur LV                1
PE Size (KByte)       4096
Total PE              640
Free PE               0
Allocated PE          640
PV UUID               6WZGDT-Sev3-jYXj-VquB-FQj2-Wbeq-cdgNLK

--- Physical volume ---

PV Name               /dev/hdb

VG Name               vg01

PV Size               232.89 GB [488397168 secs] / NOT usable

4.38 MB 

[LVM: 360 KB]
PV#                   3
PV Status             available
Allocatable           yes (but full)
Cur LV                1
PE Size (KByte)       4096
Total PE              59617
Free PE               0
Allocated PE          59617
PV UUID               nV1chY-OlRj-tLrb-cdSM-D3IN-Mvwb-U2nxfE

--- Physical volume ---

PV Name               /dev/hdc

VG Name               vg01

PV Size               232.89 GB [488397168 secs] / NOT usable

4.38 MB 

[LVM: 360 KB]
PV#                   4
PV Status             NOT available
Allocatable           yes (but full)
Cur LV                1
PE Size (KByte)       4096
Total PE              59617
Free PE               0
Allocated PE          59617
PV UUID               XMs7mJ-PdbD-voTc-IUY7-sLiu-Gg1P-99nwc5

I have checked the output of some older config files like 
vg01.conf.[1-6].old and have found one without the additional

hard disk. 

Hence no data is stored on that disk yet, I wouldn't mind to

overwrite 

the configuration, but is it save doing it? I definitely

worried about 

data loss then.

Thanks,
Stephanus

Stephanus Fengler wrote:

Hi experts,

I added a new hard disk to my system and created it

entirely as a new 

logical volume. Mounting unmounting everything worked until

reboot. It 

stops now with kerel panic and lines like:

(null) -- ERROR 2 writing volume group backup file

/etc/lvmtab.d/vg01.tmp

     vg_cfgbackup.c [line271]

vgscan -- ERROR: unable to do a backup of volume group vg01

vgscan -- ERROR: lvm_tab_vg_remove(): unlink" removing

volume group 

"vg01"  from  "/etc/lvmtab"

...

Activating volume groups
  vgchange - no volume groups found

I understand the kernel panic if lvm is unable to find the

volume 

group vg01 because that's my root system. But I don't get

the first 

error.

I rebooted with my Redhat Installation disk: linux rescue

and can activate the volume group by hand and mount the

file systems. 

So it looks to me everything is consistent in the filesystem.

So since I am pretty new to lvm, which output do you

additional need 

to help me?

Thanks in advance,
Stephanus

lvmdiskscan:

lvmdiskscan -- reading all disks / partitions (this may

take a while...)

lvmdiskscan -- /dev/hdc   [     232.89 GB] USED LVM whole disk

lvmdiskscan -- /dev/hda1  [       2.50 GB] Primary  LVM

partition [0x8E]

lvmdiskscan -- /dev/hda2  [     101.97 MB] Primary  LINUX

native 

partition [0x83]

lvmdiskscan -- /dev/hda3  [      33.67 GB] Primary  LVM

partition [0x8E]

lvmdiskscan -- /dev/hda4  [    1019.75 MB] Primary 

Windows98 extended 

partition [0x0F]

lvmdiskscan -- /dev/hda5  [    1019.72 MB] Extended LINUX swap 
partition [0x82]

lvmdiskscan -- /dev/hdb   [     232.89 GB] USED LVM whole disk

lvmdiskscan -- /dev/loop0 [      59.08 MB] free loop device

lvmdiskscan -- 3 disks

lvmdiskscan -- 2 whole disks

lvmdiskscan -- 1 loop device

lvmdiskscan -- 0 multiple devices

lvmdiskscan -- 0 network block devices

lvmdiskscan -- 5 partitions

lvmdiskscan -- 2 LVM physical volume partitions

pvscan:

pvscan -- reading all physical volumes (this may take a

while...)

pvscan -- inactive PV "/dev/hdc"  of VG "vg01" [232.88 GB /

0 free]

pvscan -- inactive PV "/dev/hda1" of VG "vg01" [2.50 GB / 0

free]

pvscan -- inactive PV "/dev/hda3" of VG "vg01" [33.66 GB /

0 free]

pvscan -- inactive PV "/dev/hdb"  of VG "vg01" [232.88 GB /

0 free]

pvscan -- total: 4 [501.94 GB] / in use: 4 [501.94 GB] / in

no VG: 0 [0]

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