Re: [gentoo-user] ext3 partition dissapeared :(

[jcd <jcd@seznam.cz>]

> You say in your original mail that after moving the data "everything was 
> fine". What exactly do you mean by that:
> 
> 1. The command ended without failure so you assume it moved stuff 
> correctly, or
> 2. You proved the move was done by mounting the partition and all your 
> files were there, or
> 3. Some other reason?
> 
> alan

"Everything was fine" mean; I created partition and then formatted it
without any errors or warnings. There are messages from syslog:
-----------------------------------------------------------------------
Jan 22 23:43:16 localhost EXT3 FS on sdb1, internal journal
Jan 22 23:43:16 localhost EXT3-fs: mounted filesystem with ordered data
mode.
-----------------------------------------------------------------------
Then I copied my data to this new partition. I could access this data
from new partition without any problems. Next day:
-----------------------------------------------------------------------
Jan 23 10:23:46 localhost VFS: Can't find ext3 filesystem on dev sdb1.
-----------------------------------------------------------------------

> It looks like when you moved the data onto the new partition, it got 
> written somewhere on the disk. However, the kernel's idea of how the 
> partitions are laid out at that time and what fdisk just wrote to the 
> disk probably don't agree and the kernel had got it wrong.... This does 
> happen when you delete two or more partitions and create one large one.

Why it can happen when replacing two partitions with large one?

I tried gpart with this output:
-----------------------------------------------------------------------
#gpart /dev/sdb
Begin scan...
Possible partition(Windows NT/W2K FS), size(40959mb), offset(0mb)
Possible partition(Linux ext2), size(197512mb), offset(40959mb)
End scan.

Checking partitions...
Partition(OS/2 HPFS, NTFS, QNX or Advanced UNIX): primary 
Partition(Linux ext2 filesystem): primary 
Ok.

Guessed primary partition table:
Primary partition(1)
   type: 007(0x07)(OS/2 HPFS, NTFS, QNX or Advanced UNIX)
   size: 40959mb #s(83885696) s(63-83885758)
   chs:  (0/1/1)-(1023/239/63)d (0/1/1)-(5547/239/62)r

Primary partition(2)
   type: 131(0x83)(Linux ext2 filesystem)
   size: 197512mb #s(404505360) s(83885760-488391119)
   chs:  (1023/239/63)-(1023/239/63)d (5548/0/1)-(32300/239/63)r

Primary partition(3)
   type: 000(0x00)(unused)
   size: 0mb #s(0) s(0-0)
   chs:  (0/0/0)-(0/0/0)d (0/0/0)-(0/0/0)r

Primary partition(4)
   type: 000(0x00)(unused)
   size: 0mb #s(0) s(0-0)
   chs:  (0/0/0)-(0/0/0)d (0/0/0)-(0/0/0)r
-----------------------------------------------------------------------
I also tried it with data about cylinders, sectors and heads taken from 'fdisk -l /dev/sdb'.
It produces same output. But I created ext3 on whole disk, I'm sure.


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