[linux-lvm] can data be found after cleaning the first sector by mistake? (tears in my eyes)

[linux-lvm] can data be found after cleaning the first sector by mistake? (tears in my eyes)

[Ming Zhang]

I have 2 disk sda and sdb, build a md0 on them, and create vg and lv on
top of md0.

when i upgraded my system from fedora 2 to 3, it reported my sda and sdb
contain uninitialized partition table and need to clean. i mad a stupid
error by pressing yes!

now no matter what command i execute, it reports.

[root@localhost ~]# lvscan
  Logical volume (vol1) contains an incomplete mapping table.
  Volume group "datavg" not found
[root@localhost ~]# pvscan -P
  Partial mode. Incomplete volume groups will be activated read-only.
  Logical volume (vol1) contains an incomplete mapping table.
  No matching physical volumes found
[root@localhost ~]# vgmknodes
  Logical volume (vol1) contains an incomplete mapping table.
  Volume group "datavg" not found

i wonder if there is any way to get my personal data back. thanks so
much if anybody can give a hint!



these are my system information

[root@localhost ~]# fdisk /dev/sda -l
 
Disk /dev/sda: 164.6 GB, 164696555520 bytes
255 heads, 63 sectors/track, 20023 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
 
   Device Boot      Start         End      Blocks   Id  System

[root@localhost ~]# fdisk /dev/sdb -l
 
Disk /dev/sdb: 164.6 GB, 164696555520 bytes
255 heads, 63 sectors/track, 20023 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
 
   Device Boot      Start         End      Blocks   Id  System

[root@localhost ~]# more /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sda[0] sdb[1]
      160836416 blocks [2/2] [UU]
       
unused devices: <none>

Re: [linux-lvm] can data be found after cleaning the first sector by mistake? (tears in my eyes)

[Ming Zhang]

forgot to mention that 

[root@localhost ~]# pvcreate -t /dev/md0
  Test mode: Metadata will NOT be updated.
  Can't initialize physical volume "/dev/md0" of volume group "datavg"
without -ff

so it looks like it can tell /dev/md0 is a pv belongs to vg datavg, but
some data are missed.

ming


On Sun, 2005-01-23 at 17:59, Ming Zhang wrote:
> I have 2 disk sda and sdb, build a md0 on them, and create vg and lv on
> top of md0.
> 
> when i upgraded my system from fedora 2 to 3, it reported my sda and sdb
> contain uninitialized partition table and need to clean. i mad a stupid
> error by pressing yes!
> 
> now no matter what command i execute, it reports.
> 
> [root@localhost ~]# lvscan
>   Logical volume (vol1) contains an incomplete mapping table.
>   Volume group "datavg" not found
> [root@localhost ~]# pvscan -P
>   Partial mode. Incomplete volume groups will be activated read-only.
>   Logical volume (vol1) contains an incomplete mapping table.
>   No matching physical volumes found
> [root@localhost ~]# vgmknodes
>   Logical volume (vol1) contains an incomplete mapping table.
>   Volume group "datavg" not found
> 
> i wonder if there is any way to get my personal data back. thanks so
> much if anybody can give a hint!
> 
> 
> 
> these are my system information
> 
> [root@localhost ~]# fdisk /dev/sda -l
>  
> Disk /dev/sda: 164.6 GB, 164696555520 bytes
> 255 heads, 63 sectors/track, 20023 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
>  
>    Device Boot      Start         End      Blocks   Id  System
> 
> [root@localhost ~]# fdisk /dev/sdb -l
>  
> Disk /dev/sdb: 164.6 GB, 164696555520 bytes
> 255 heads, 63 sectors/track, 20023 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
>  
>    Device Boot      Start         End      Blocks   Id  System
> 
> [root@localhost ~]# more /proc/mdstat
> Personalities : [raid1]
> md0 : active raid1 sda[0] sdb[1]
>       160836416 blocks [2/2] [UU]
>        
> unused devices: <none>
> 
> 
> _______________________________________________
> 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/