Re: [linux-lvm] help

["Diaz Rodriguez, Eduardo" <ediaz@pk25.com>]

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
> 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,
> 
> -- 
> Colm G. Connolly,		Tel: +353-1-716-2855
> Dept. of Computer Science,	Fax: +353-1-269-7262
> University College Dublin,	MSN: colmconn@hotmail.com
> Belfield, Dublin 4, �ire.	Web: http://inismor.ucd.ie/~colmconn/
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/


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