Date:	Wed, 25 Sep 2013 15:24:34 -0400
From:	InvTraySts <invtrasys@...il.com>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: Fwd: Need help with Data Recovery on Ext4 partitions that became
 corrupted on running OS

And am cloning the drive without the sync parameter this time.
root@...ver:~# dd if=/dev/sda of=/dev/sdf bs=4096 conv=notrunc,noerror
After it finished, I attempted to run dumpe2fs and it still responds with:
root@...ver:~# dumpe2fs /dev/sdf1
dumpe2fs 1.42.5 (29-Jul-2012)
dumpe2fs: Bad magic number in super-block while trying to open /dev/sdf1
Couldn't find valid filesystem superblock.


So I went ahead and tried to run the tune2fs command:
root@...ver:~# tune2fs -f -O ^has_journal /dev/sda1
tune2fs 1.42.5 (29-Jul-2012)
tune2fs: Bad magic number in super-block while trying to open /dev/sda1
Couldn't find valid filesystem superblock.

Which also fails, yet dumpe2fs on /dev/sda1 works fine.


On Wed, Sep 25, 2013 at 12:12 PM, Jan Kara <jack@...e.cz> wrote:
> On Tue 24-09-13 22:25:49, InvTraySts wrote:
>> So long story short, I had a server running that had a processor fail
>> while powered on, causing the file systems to become corrupt. I
>> replaced the motherboard, processor and power supply just to be on the
>> safe side. However, I am at a bit of a loss as to what to do now. I
>> was working sandeen in the OFTC IRC channel, but, on his
>> recommendation he suggested me to post something to the mailing list.
>>
>> Lets start off with one drive at a time (I have 4 that are corrupt).
>> The specific logical drive in question was in RAID1 on a Dell PERC 5/i
>> card.
>> If I try to mount this using:
>> mount -t ext4 /dev/sda1 /media/tmp
>>
>> It complains in dmesg with the following output:
>> 685621.845207] EXT4-fs error (device sda1): ext4_iget:3888: inode #8:
>> comm mount: bad extra_isize (18013 != 256)
>> [685621.845213] EXT4-fs (sda1): no journal found
>>
>>
>> However, if I run dumpe2fs -f /dev/sda1 I get the following output:
>> root@...ver:~# dumpe2fs -f /dev/sda1
>> dumpe2fs 1.42.5 (29-Jul-2012)
>> Filesystem volume name:   root
>> Last mounted on:          /media/ubuntu/root
>> Filesystem UUID:          f959e195-[removed]
>> Filesystem magic number:  0xEF53
>> Filesystem revision #:    1 (dynamic)
>> Filesystem features:      has_journal ext_attr resize_inode dir_index
>> filetype extent flex_bg sparse_super large_file huge_file uninit_bg
>> dir_nlink extra_isize
>> Filesystem flags:         signed_directory_hash
>> Default mount options:    user_xattr acl
>> Filesystem state:         not clean with errors
>> Errors behavior:          Continue
>> Filesystem OS type:       Linux
>> Inode count:              4849664
>> Block count:              19398144
>> Reserved block count:     969907
>> Free blocks:              17034219
>> Free inodes:              4592929
>> First block:              0
>> Block size:               4096
>> Fragment size:            4096
>> Reserved GDT blocks:      1019
>> Blocks per group:         32768
>> Fragments per group:      32768
>> Inodes per group:         8192
>> Inode blocks per group:   512
>> Flex block group size:    16
>> Filesystem created:       Sat May 25 14:59:50 2013
>> Last mount time:          Sat Aug 24 11:04:25 2013
>> Last write time:          Tue Sep 24 13:55:36 2013
>> Mount count:              0
>> Maximum mount count:      -1
>> Last checked:             Sat Aug 24 16:56:09 2013
>> Check interval:           0 (<none>)
>> Lifetime writes:          107 GB
>> Reserved blocks uid:      0 (user root)
>> Reserved blocks gid:      0 (group root)
>> First inode:              11
>> Inode size:               256
>> Required extra isize:     28
>> Desired extra isize:      28
>> Journal inode:            8
>> Default directory hash:   half_md4
>> Directory Hash Seed:      01a8f605-b2bc-41ee-b7b5-11d843ab622f
>> Journal backup:           inode blocks
>> FS Error count:           8
>> First error time:         Sat Aug 24 13:44:55 2013
>> First error function:     ext4_iget
>> First error line #:       3889
>> First error inode #:      8
>> First error block #:      0
>> Last error time:          Tue Sep 24 13:55:36 2013
>> Last error function:      ext4_iget
>> Last error line #:        3888
>> Last error inode #:       8
>> Last error block #:       0
>> dumpe2fs: Corrupt extent header while reading journal super block
>   OK, so really journal inode (inode #8) looks toast but superblock looks
> OK.
>
>> So I attempted to clone the drive to a 2TB backup drive that is empty,
>> and currently I am having more problems with the cloned drive than I
>> am with the original.
>>
>> sandeen said something about using tune2fs to tell it to remove the
>> has_journal flag, but I might need some assistance with that.
>   Yes, you can do that with:
> tune2fs -f -O ^has_journal /dev/sda1
>
>   Let's see what mount will say after that.
>
>   Another option is to run
> debugfs /dev/sda1
>
>   Then you can use ls, cd, and other debugfs commands to move within the
> filesystem and investigate things. If that will work, you have a reasonable
> chance of getting at least some data back.
>
>                                                                 Honza
> --
> Jan Kara <jack@...e.cz>
> SUSE Labs, CR


On Wed, Sep 25, 2013 at 12:12 PM, Jan Kara <jack@...e.cz> wrote:
> On Tue 24-09-13 22:25:49, InvTraySts wrote:
>> So long story short, I had a server running that had a processor fail
>> while powered on, causing the file systems to become corrupt. I
>> replaced the motherboard, processor and power supply just to be on the
>> safe side. However, I am at a bit of a loss as to what to do now. I
>> was working sandeen in the OFTC IRC channel, but, on his
>> recommendation he suggested me to post something to the mailing list.
>>
>> Lets start off with one drive at a time (I have 4 that are corrupt).
>> The specific logical drive in question was in RAID1 on a Dell PERC 5/i
>> card.
>> If I try to mount this using:
>> mount -t ext4 /dev/sda1 /media/tmp
>>
>> It complains in dmesg with the following output:
>> 685621.845207] EXT4-fs error (device sda1): ext4_iget:3888: inode #8:
>> comm mount: bad extra_isize (18013 != 256)
>> [685621.845213] EXT4-fs (sda1): no journal found
>>
>>
>> However, if I run dumpe2fs -f /dev/sda1 I get the following output:
>> root@...ver:~# dumpe2fs -f /dev/sda1
>> dumpe2fs 1.42.5 (29-Jul-2012)
>> Filesystem volume name:   root
>> Last mounted on:          /media/ubuntu/root
>> Filesystem UUID:          f959e195-[removed]
>> Filesystem magic number:  0xEF53
>> Filesystem revision #:    1 (dynamic)
>> Filesystem features:      has_journal ext_attr resize_inode dir_index
>> filetype extent flex_bg sparse_super large_file huge_file uninit_bg
>> dir_nlink extra_isize
>> Filesystem flags:         signed_directory_hash
>> Default mount options:    user_xattr acl
>> Filesystem state:         not clean with errors
>> Errors behavior:          Continue
>> Filesystem OS type:       Linux
>> Inode count:              4849664
>> Block count:              19398144
>> Reserved block count:     969907
>> Free blocks:              17034219
>> Free inodes:              4592929
>> First block:              0
>> Block size:               4096
>> Fragment size:            4096
>> Reserved GDT blocks:      1019
>> Blocks per group:         32768
>> Fragments per group:      32768
>> Inodes per group:         8192
>> Inode blocks per group:   512
>> Flex block group size:    16
>> Filesystem created:       Sat May 25 14:59:50 2013
>> Last mount time:          Sat Aug 24 11:04:25 2013
>> Last write time:          Tue Sep 24 13:55:36 2013
>> Mount count:              0
>> Maximum mount count:      -1
>> Last checked:             Sat Aug 24 16:56:09 2013
>> Check interval:           0 (<none>)
>> Lifetime writes:          107 GB
>> Reserved blocks uid:      0 (user root)
>> Reserved blocks gid:      0 (group root)
>> First inode:              11
>> Inode size:               256
>> Required extra isize:     28
>> Desired extra isize:      28
>> Journal inode:            8
>> Default directory hash:   half_md4
>> Directory Hash Seed:      01a8f605-b2bc-41ee-b7b5-11d843ab622f
>> Journal backup:           inode blocks
>> FS Error count:           8
>> First error time:         Sat Aug 24 13:44:55 2013
>> First error function:     ext4_iget
>> First error line #:       3889
>> First error inode #:      8
>> First error block #:      0
>> Last error time:          Tue Sep 24 13:55:36 2013
>> Last error function:      ext4_iget
>> Last error line #:        3888
>> Last error inode #:       8
>> Last error block #:       0
>> dumpe2fs: Corrupt extent header while reading journal super block
>   OK, so really journal inode (inode #8) looks toast but superblock looks
> OK.
>
>> So I attempted to clone the drive to a 2TB backup drive that is empty,
>> and currently I am having more problems with the cloned drive than I
>> am with the original.
>>
>> sandeen said something about using tune2fs to tell it to remove the
>> has_journal flag, but I might need some assistance with that.
>   Yes, you can do that with:
> tune2fs -f -O ^has_journal /dev/sda1
>
>   Let's see what mount will say after that.
>
>   Another option is to run
> debugfs /dev/sda1
>
>   Then you can use ls, cd, and other debugfs commands to move within the
> filesystem and investigate things. If that will work, you have a reasonable
> chance of getting at least some data back.
>
>                                                                 Honza
> --
> Jan Kara <jack@...e.cz>
> SUSE Labs, CR
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Powered by blists - more mailing lists