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linux-lvm Colm G. Connolly 4 participants 5 messages May 5, 2005 – May 7, 2005

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Colm G. Connolly

author

2005-05-05 12:26 UTC #0 lore raw

Hi all,

I've just got a new 250G hard drive and have been trying to add it to an
exitiing lvm2 setup on my system. However, I've screwed something up
and now I can't mount the volume which is /dev/HOME_VG/HOME_LV and contains an XFS file system.

My question is this: how I can I restore the original configuration so that I can see the contents of the logical volume?

I've included a transcript of the commands I've run to make this mess.

I'm running

# lvm version
  LVM version:     2.01.04 (2005-02-09)
  Library version: 1.01.00-ioctl (2005-01-17)
  Driver version:  4.4.0

on Linux 2.6.11.7 SMP i686 on a Debian/testing system

The transcript of commands I've run is as follows

  461  pvcreate /dev/hdd
  462  pvscan
  463  mount
  464  vgextend HOME_VG /dev/hdd
  465  pvscan
  466  man xfs_growfs
  467  df -h
  468  xfs_growfs /home

468 didn't work since I hadn't extended the logical volume.

  469  df -h
  470  pvscan
  471  man pvscan
  472  pvscan -v
  473  pvscan -vv
  474  lvscan
  475  man lvextend
  476  man lvextend
  477  mount
  478  lvextend /dev/HOME_VG/HOME_LV /dev/hdd
  479  lvextend /dev/HOME_VG/HOME_LV
  480  lvextend -L250G /dev/HOME_VG/HOME_LV
  481  lvscan
  482  mount
  483  df -h

At this point I got a bit concerned that I had added 250G to the logical volume but pvdisplay only reported a capicity of 232.88G even though hdd is a 250G hard drive. So I started to try to remove the

484 lvreduce -L250G /dev/HOME_VG/HOME_LV 485 lvreduce -L-250G /dev/HOME_VG/HOME_LV

None of these reduction attempts worked. lvreduce complained that it was unable to reduce below 1 extent.

  486  pvdisplay
  487  lvdisplay
  488  lvscan
  489  vgreduce /dev/HOME_VG/HOME_LV /dev/hdd
  490  vgreduce /dev/HOME_VG /dev/hdd
  491  ls /var/lock/lvm/
  492  lvscan
  493  lvdisplay
  494  lvresize
  495  lvresize -L-250G /dev/HOME_VG/HOME_LV
  496  lvreduce -L-250G /dev/HOME_VG/HOME_LV

Neither of these commands worked either.

  497  man lvmchange
  498  man lvs
  499  lvs
  500  pvs
  501  lvmdiskscan
  502  lvmreduce -L -250G /dev/HOME_VG/HOME_LV
  503  /sbin/lvmreduce -L -250G /dev/HOME_VG/HOME_LV
  504  which lvmreduce
  505  which lvm
  506  ls /sbin/lvm*
  507  ls -l /sbin/lvm*
  508  lvreduce -L -250G /dev/HOME_VG/HOME_LV
  509  lvscan
  510  lvmdiskscan
  511  pvdisplay
  512  pvdisplay /dev/hdd
  513  man pvmove
  514  pvmove -v /dev/hdd
  515  man lvchange
  516  lvscan
  517  lvscan -vv
  518  lvreduce -L-250G /dev/HOME_VG/HOME_LV
  519  mount -oro /home
  520  mount
  521  df -h
  522  umount /home
  523  lvscan
  524  lvdisplay
  525  pvdisplay

Up to this point I could mount /dev/HOME_VG/HOME_LV on /home no problem

526 lvreduce -L -232.88G /dev/HOME_VG/HOME_LV

This command worked and the volume group was reduced. But from now this point on I can no longer mount the volume group

  527  lvscan
  528  lvdisplay
  529  mount -oro /home
  530  lvscan
  531  lvmdiskscan
  532  pvscan
  533  man xfs_repair
  534  man xfs_check
  535  xfs_check /dev/HOME_VG/HOME_LV

can't seek in filesystem at bb 36633600 can't read superblock for ag 30 can't seek in filesystem at bb 37854720 can't read superblock for ag 31

536 h|grep mount
537 mount -oro /home

This command reports
mount: /dev/mapper/HOME_VG-HOME_LV: can't read superblock

  538  man vgcfgrestore
  539  cd /etc/lvm/
  540  sl
  541  cd backup/
  542  ls
  543  less HOME_VG
  544  less HOME_VG
  545  man vgcfgrestore
  546  vgcfgrestore -v HOME_VG
  547  mount -o ro /home/

This command reports
mount: /dev/mapper/HOME_VG-HOME_LV: can't read superblock

At this point I've stopped. I can't figure out how to undo the damage I've done. And I really need to recover the original setup. There is stuff on the logical volume for which I have no backup. How I wish I'd taken my own advice and backed the important stuff up.

Right now pvscan reports

  PV /dev/hdc1   VG HOME_VG   lvm2 [9.32 GB / 0    free]
  PV /dev/hda5   VG HOME_VG   lvm2 [8.82 GB / 1.01 GB free]
  PV /dev/hdd    VG HOME_VG   lvm2 [232.88 GB / 232.88 GB free]

Total: 3 [251.02 GB] / in use: 3 [251.02 GB] / in no VG: 0 [0 ]

and

# lvmdiskscan
  /dev/hda1 [       47.03 MB]
  /dev/hdc1 [        9.32 GB] LVM physical volume
  /dev/hda2 [        8.79 GB]
  /dev/hda3 [     1019.75 MB]
  /dev/hda5 [        8.82 GB] LVM physical volume
  /dev/hdd  [      232.89 GB] LVM physical volume
  /dev/hdb1 [        6.01 GB]
  0 disks
  4 partitions
  1 LVM physical volume whole disk
  2 LVM physical volumes
root@darwin:/etc/lvm/backup# lvs
lvs     lvscan
root@darwin:/etc/lvm/backup# lvscan
  ACTIVE            '/dev/HOME_VG/HOME_LV' [17.12 GB] inherit

root@darwin:/etc/lvm/backup# pvdisplay
  --- Physical volume ---
  PV Name               /dev/hdc1
  VG Name               HOME_VG
  PV Size               9.32 GB / not usable 0
  Allocatable           yes (but full)
  PE Size (KByte)       4096
  Total PE              2385
  Free PE               0
  Allocated PE          2385
  PV UUID               XzBfoB-cV7O-hIzQ-3Tjn-jam0-IBXw-MJKV5W

--- Physical volume ---

  PV Name               /dev/hda5
  VG Name               HOME_VG
  PV Size               8.82 GB / not usable 0
  Allocatable           yes
  PE Size (KByte)       4096
  Total PE              2257
  Free PE               259
  Allocated PE          1998
  PV UUID               NIO6ey-B8gt-APxD-BEOP-cmpd-UCBf-KY2rLB

--- Physical volume ---

  PV Name               /dev/hdd
  VG Name               HOME_VG
  PV Size               232.88 GB / not usable 0
  Allocatable           yes
  PE Size (KByte)       4096
  Total PE              59618
  Free PE               59618
  Allocated PE          0
  PV UUID               2hYdvL-9I7I-tz01-Rhza-ZLyp-tsTp-niP5pJ

Any help most gratefully appreciated.

Thanks in advance,

Signature · 4 lines

Colm G. Connolly,		Tel: +353-1-716-2855
Dept. of Computer Science,	Fax: +353-1-269-7262
University College Dublin,	MSN: [email protected]
Belfield, Dublin 4, ï¿½ire.	Web: http://inismor.ucd.ie/~colmconn/

Martin Eisenhardt

2005-05-05 12:34 UTC #1 lore raw

Hello Colm,

Quoted 8 lines · Colm G. Connolly

I've just got a new 250G hard drive and have been trying to add it to an [...]
482 mount
483 df -h
At this point I got a bit concerned that I had added 250G to the logical volume but pvdisplay only reported a capicity of 232.88G even though hdd is a 250G hard drive. So I started to try to remove the

I know that this is *not* your main concern but I think it worth noting that the size of your 250G harddisk was correctly reported as being 232.88G. The reason being that harddisk vendors use 1G = 1000^3 while computer science defines 1G = 1024^3. (Note: I think there are some standard definition by the IEEE(?) but I don't have a URL for that.)

So 250*1000^3 = 250.000.000.000 ~ 232.8*1024^3

Wish you all the luck for the problems remaining!

Kind regards
Martin Eisenhardt

Signature · 8 lines

Dipl.Wirtsch.Inf.(Univ.) Martin Eisenhardt

Bamberg University
Media Informatics
D - 96045 Bamberg

fon: +49 (951) 863 - 2856
fax: +49 (951) 863 - 2852

Diaz Rodriguez, Eduardo

2005-05-05 13:16 UTC #2 lore raw

In reply to Colm G. Connolly

your first error: don't made backup.

your second error:

# From LVM how to

xfs
There is no way to shrink XFS file systems.

If your are touch lvm2 you must know that about 250Gx1000 and 233x1024.

try use xfs_repair -n for see the reparis..

I use (but it is only a personal opinion, this is very dangerous) (use again the first commands).
vgextend my_volume_group /dev/hdc1
lvextend -L250G /dev/HOME_VG/HOME_LV
lvscan

In this point use xfs_repair -n
If you see good, use xfs_repair (pray)....
if you don't have luck try xfs_repair -d (after of this reboot) (read man xfs_repair)
try to mount. (pray again).....

good luck

On Thu, 05 May 2005 13:26:43 +0100, Colm G. Connolly wrote

Quoted 210 lines

Hi all,
I've just got a new 250G hard drive and have been trying to add it
to an exitiing lvm2 setup on my system. However, I've screwed
something up and now I can't mount the volume which is /dev/HOME_VG/HOME_LV and contains an XFS file system.
My question is this: how I can I restore the original configuration so that I can see the contents of the logical volume?
I've included a transcript of the commands I've run to make this mess.
I'm running
# lvm version
   LVM version:     2.01.04 (2005-02-09)
   Library version: 1.01.00-ioctl (2005-01-17)
   Driver version:  4.4.0
on Linux 2.6.11.7 SMP i686 on a Debian/testing system
The transcript of commands I've run is as follows
   461  pvcreate /dev/hdd
   462  pvscan
   463  mount
   464  vgextend HOME_VG /dev/hdd
   465  pvscan
   466  man xfs_growfs
   467  df -h
   468  xfs_growfs /home
468 didn't work since I hadn't extended the logical volume.
   469  df -h
   470  pvscan
   471  man pvscan
   472  pvscan -v
   473  pvscan -vv
   474  lvscan
   475  man lvextend
   476  man lvextend
   477  mount
   478  lvextend /dev/HOME_VG/HOME_LV /dev/hdd
   479  lvextend /dev/HOME_VG/HOME_LV
   480  lvextend -L250G /dev/HOME_VG/HOME_LV
   481  lvscan
   482  mount
   483  df -h
At this point I got a bit concerned that I had added 250G to the logical volume but pvdisplay only reported a capicity of 232.88G even though hdd is a 250G hard drive. So I started to try to remove the
   484  lvreduce -L250G /dev/HOME_VG/HOME_LV
   485  lvreduce -L-250G /dev/HOME_VG/HOME_LV
None of these reduction attempts worked. lvreduce complained that it was unable to reduce below 1 extent.
   486  pvdisplay
   487  lvdisplay
   488  lvscan
   489  vgreduce /dev/HOME_VG/HOME_LV /dev/hdd
   490  vgreduce /dev/HOME_VG /dev/hdd
   491  ls /var/lock/lvm/
   492  lvscan
   493  lvdisplay
   494  lvresize
   495  lvresize -L-250G /dev/HOME_VG/HOME_LV
   496  lvreduce -L-250G /dev/HOME_VG/HOME_LV
Neither of these commands worked either.
   497  man lvmchange
   498  man lvs
   499  lvs
   500  pvs
   501  lvmdiskscan
   502  lvmreduce -L -250G /dev/HOME_VG/HOME_LV
   503  /sbin/lvmreduce -L -250G /dev/HOME_VG/HOME_LV
   504  which lvmreduce
   505  which lvm
   506  ls /sbin/lvm*
   507  ls -l /sbin/lvm*
   508  lvreduce -L -250G /dev/HOME_VG/HOME_LV
   509  lvscan
   510  lvmdiskscan
   511  pvdisplay
   512  pvdisplay /dev/hdd
   513  man pvmove
   514  pvmove -v /dev/hdd
   515  man lvchange
   516  lvscan
   517  lvscan -vv
   518  lvreduce -L-250G /dev/HOME_VG/HOME_LV
   519  mount -oro /home
   520  mount
   521  df -h
   522  umount /home
   523  lvscan
   524  lvdisplay
   525  pvdisplay
Up to this point I could mount /dev/HOME_VG/HOME_LV on /home no problem
   526  lvreduce -L -232.88G /dev/HOME_VG/HOME_LV
This command worked and the volume group was reduced. But from now this point on I can no longer mount the volume group
   527  lvscan
   528  lvdisplay
   529  mount -oro /home
   530  lvscan
   531  lvmdiskscan
   532  pvscan
   533  man xfs_repair
   534  man xfs_check
   535  xfs_check /dev/HOME_VG/HOME_LV
can't seek in filesystem at bb 36633600
can't read superblock for ag 30
can't seek in filesystem at bb 37854720
can't read superblock for ag 31
536 h|grep mount
537 mount -oro /home
This command reports
mount: /dev/mapper/HOME_VG-HOME_LV: can't read superblock
   538  man vgcfgrestore
   539  cd /etc/lvm/
   540  sl
   541  cd backup/
   542  ls
   543  less HOME_VG
   544  less HOME_VG
   545  man vgcfgrestore
   546  vgcfgrestore -v HOME_VG
   547  mount -o ro /home/
This command reports
mount: /dev/mapper/HOME_VG-HOME_LV: can't read superblock
At this point I've stopped. I can't figure out how to undo the damage I've done. And I really need to recover the original setup. There is stuff on the logical volume for which I have no backup. How I wish I'd taken my own advice and backed the important stuff up.
Right now pvscan reports
   PV /dev/hdc1   VG HOME_VG   lvm2 [9.32 GB / 0    free]
   PV /dev/hda5   VG HOME_VG   lvm2 [8.82 GB / 1.01 GB free]
   PV /dev/hdd    VG HOME_VG   lvm2 [232.88 GB / 232.88 GB free]
Total: 3 [251.02 GB] / in use: 3 [251.02 GB] / in no VG: 0 [0 ]
and
# lvmdiskscan
   /dev/hda1 [       47.03 MB]
   /dev/hdc1 [        9.32 GB] LVM physical volume
   /dev/hda2 [        8.79 GB]
   /dev/hda3 [     1019.75 MB]
   /dev/hda5 [        8.82 GB] LVM physical volume
   /dev/hdd  [      232.89 GB] LVM physical volume
   /dev/hdb1 [        6.01 GB]
   0 disks
   4 partitions
   1 LVM physical volume whole disk
   2 LVM physical volumes
root@darwin:/etc/lvm/backup# lvs
lvs     lvscan
root@darwin:/etc/lvm/backup# lvscan
   ACTIVE            '/dev/HOME_VG/HOME_LV' [17.12 GB] inherit
root@darwin:/etc/lvm/backup# pvdisplay
   --- Physical volume ---
   PV Name               /dev/hdc1
   VG Name               HOME_VG
   PV Size               9.32 GB / not usable 0
   Allocatable           yes (but full)
   PE Size (KByte)       4096
   Total PE              2385
   Free PE               0
   Allocated PE          2385
   PV UUID               XzBfoB-cV7O-hIzQ-3Tjn-jam0-IBXw-MJKV5W
--- Physical volume ---
   PV Name               /dev/hda5
   VG Name               HOME_VG
   PV Size               8.82 GB / not usable 0
   Allocatable           yes
   PE Size (KByte)       4096
   Total PE              2257
   Free PE               259
   Allocated PE          1998
   PV UUID               NIO6ey-B8gt-APxD-BEOP-cmpd-UCBf-KY2rLB
--- Physical volume ---
   PV Name               /dev/hdd
   VG Name               HOME_VG
   PV Size               232.88 GB / not usable 0
   Allocatable           yes
   PE Size (KByte)       4096
   Total PE              59618
   Free PE               59618
   Allocated PE          0
   PV UUID               2hYdvL-9I7I-tz01-Rhza-ZLyp-tsTp-niP5pJ

Quoted 15 lines

Any help most gratefully appreciated.

Thanks in advance,

Signature · 10 lines

Colm G. Connolly,		Tel: +353-1-716-2855
Dept. of Computer Science,	Fax: +353-1-269-7262
University College Dublin,	MSN: [email protected]
Belfield, Dublin 4, ï¿½ire.	Web: http://inismor.ucd.ie/~colmconn/

_______________________________________________
linux-lvm mailing list
[email protected]
https://www.redhat.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

=======================================================================================
El otro regalo de los viejos.
=======================================================================================

David Mohr

2005-05-05 15:05 UTC #3 lore raw

Hi,

Quoted 8 lines · Eduardo

# From LVM how to
xfs
There is no way to shrink XFS file systems.
If your are touch lvm2 you must know that about 250Gx1000 and 233x1024.
try use xfs_repair -n for see the reparis..

I don't think that's an issue here because the history that was posted did not include an xfs_grow after he grew the LV. As such this should IMO be a pure LVM issue, because XFS was not grown.

Quoted 5 lines

I use (but it is only a personal opinion, this is very dangerous) (use again the first commands).
vgextend my_volume_group /dev/hdc1
lvextend -L250G /dev/HOME_VG/HOME_LV
lvscan

Hmm, I agree that it sounds a bit "dangerous" but it might be worth a shot.

Quoted 5 lines

In this point use xfs_repair -n
If you see good, use xfs_repair (pray)....
if you don't have luck try xfs_repair -d (after of this reboot) (read man xfs_repair)
try to mount. (pray again).....

See above, should not be necessary.

~David

Colm G. Connolly

author

2005-05-07 14:18 UTC #4 lore raw

Quoted 9 lines · David Mohr

Hi,
Quoted 5 lines · Eduardo
# From LVM how to
xfs
There is no way to shrink XFS file systems.

Quoted 8 lines

Quoted 3 lines
If your are touch lvm2 you must know that about 250Gx1000 and 233x1024.
try use xfs_repair -n for see the reparis..
I don't think that's an issue here because the history that was posted did not include an xfs_grow after he grew the LV. As such this should IMO be a pure LVM issue, because XFS was not grown.

Yep. I never changed the size of teh XFS filesystem. The issue was with the underlying LVM geometry.

Quoted 10 lines

Quoted 7 lines
I use (but it is only a personal opinion, this is very dangerous) (use again the first commands).
vgextend my_volume_group /dev/hdc1
lvextend -L250G /dev/HOME_VG/HOME_LV
lvscan
Hmm, I agree that it sounds a bit "dangerous" but it might be worth a shot.

Well it worked. I've since copied everything off the logical volume and recreated it with the correct size.

Quoted 10 lines

Quoted 7 lines
In this point use xfs_repair -n
If you see good, use xfs_repair (pray)....
if you don't have luck try xfs_repair -d (after of this reboot) (read man xfs_repair)
try to mount. (pray again).....
See above, should not be necessary.

Thanks to all for the help.

Regards,

Signature · 4 lines

Colm G. Connolly		| Tel   : +353-1-716-2855
Department of Computer Science	| Fax   : +353-1-269-7262
University College Dublin (UCD)	| Web   : http://inismor.ucd.ie/~colmconn
Belfield, Dublin 4, ï¿½ire	| MSN   : [email protected]

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