Difference between revisions of "Memperbaiki Superblock ext4"

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(New page: Sumber: http://linuxexpresso.wordpress.com/2010/03/31/repair-a-broken-ext4-superblock-in-ubuntu/ HOWTO: Repair a broken Ext4 Superblock in Ubuntu 31Mar10 This has happened to me a few ...)
 
 
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Cek partisi yang ada,
  
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HOWTO: Repair a broken Ext4 Superblock in Ubuntu
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sudo fdisk -l
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31Mar10
 
  
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This has happened to me a few times, and it’s not a nice problem to find yourself in. You computer won’t boot, all your filesystem checks tell you you’ve a bad superblock, but you cant seem to find how to fix it. Well, here goes :)
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Dapatkan nomor partisi yang digunakan,seperti, /dev/sda3 atau /dev/hdb1.
  
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This guide is for ext4 , though I’ll explain how other filesystems can be cured along the way. The easiest way to carry all this out, seeing as your computer probably won’t boot at this stage, is to download and burn a copy of Parted Magic. Boot from that, and you’ll access to a number of useful tools.
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Pastikan superblock yang menjadi masalah, cek filesystem ganti xxx dengan nama partisi. Kita dapat mengubah ext4 menjadi ext3 atau ext2
  
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First, figure out what partition we’re dealing with.
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sudo fsck.ext4 -v /dev/xxx
  
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Jika superblock korup, keluaran akan seperti berikut
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    sudo fdisk -l
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fsck /dev/sda5
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fsck 1.41.4 (27-Jan-2009)
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The above will list all the partitions on all the drives in your computer. To recover a lost partition, your going to need Testdisk. Testdisk is included in Parted Magic, and there’s a great guide on their site. For this though, we just need the partition number, such as /dev/sda3 or /dev/hdb1.
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e2fsck 1.41.4 (27-Jan-2009)
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fsck.ext4: Group descriptors look bad... trying backup blocks...
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Now, make sure your superblock is the problem, by starting a filesystem check, replacing xxx with your partition name. Here, you can change ext4 to ext3, or ext2 to suit the filesystem.
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fsck.ext4: Bad magic number in super-block while trying to open /dev/sda5
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    sudo fsck.ext4 -v /dev/xxx
 
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If your superblock is corrupt, the output will look like this
 
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    2
 
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    3
 
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    4
 
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    5
 
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    6
 
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    7
 
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    8
 
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    9
 
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    10
 
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    11
 
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    fsck /dev/sda5
 
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    fsck 1.41.4 (27-Jan-2009)
 
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    e2fsck 1.41.4 (27-Jan-2009)
 
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    fsck.ext4: Group descriptors look bad... trying backup blocks...
 
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    fsck.ext4: Bad magic number in super-block while trying to open /dev/sda5
 
 
      
 
      
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    The superblock could not be read or does not describe a correct ext4
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The superblock could not be read or does not describe a correct ext4
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    filesystem.  If the device is valid and it really contains an ext4
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filesystem.  If the device is valid and it really contains an ext4
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    filesystem (and not swap or ufs or something else), then the superblock
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filesystem (and not swap or ufs or something else), then the superblock
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    is corrupt, and you might try running e2fsck with an alternate superblock:
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is corrupt, and you might try running e2fsck with an alternate superblock:
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    e2fsck -b 8193 <device>
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e2fsck -b 8193 <device>
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Now lets find where your superblock backups are kept.
 
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    sudo mke2fs -n /dev/xxx
 
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Down at the bottom of this output, should be a list of the backups
 
  
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Selanjutnya kita perlu menemukan dimana backup superblock di simpan.
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    2
 
 
    
 
    
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    Superblock backups stored on blocks:
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sudo mke2fs -n /dev/xxx
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    32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208
 
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Your almost there. Finally, restore the superblock from the backup, again replacing the x’s with your partition name, and block_number with the first backup superblock.
 
  
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Akan tampak daftar tempat backup
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    1
 
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    sudo e2fsck -b block_number /dev/xxx
 
  
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Now reboot, and your superblock should be fixed. If it’s not, repeat the steps, but restore a different backup superblock
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Superblock backups stored on blocks:
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32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208
  
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Restore superblock dari backup, ganti xxx dengan nama partisi dan block_number dengan nomor backup.
  
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sudo e2fsck -b block_number /dev/xxx
  
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Reboot, dan superblock harusnya fix.
  
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Jika tidak, ulangi langkah di atas, tapi restore dari backup superblock lainnya.
  
  

Latest revision as of 07:55, 14 July 2014

Sumber: http://linuxexpresso.wordpress.com/2010/03/31/repair-a-broken-ext4-superblock-in-ubuntu/


Cek partisi yang ada, 

sudo fdisk -l

Dapatkan nomor partisi yang digunakan,seperti, /dev/sda3 atau /dev/hdb1.

Pastikan superblock yang menjadi masalah, cek filesystem ganti xxx dengan nama partisi. Kita dapat mengubah ext4 menjadi ext3 atau ext2 

sudo fsck.ext4 -v /dev/xxx

Jika superblock korup, keluaran akan seperti berikut 

fsck /dev/sda5
fsck 1.41.4 (27-Jan-2009)
e2fsck 1.41.4 (27-Jan-2009)
fsck.ext4: Group descriptors look bad... trying backup blocks...
fsck.ext4: Bad magic number in super-block while trying to open /dev/sda5
    
The superblock could not be read or does not describe a correct ext4
filesystem.  If the device is valid and it really contains an ext4
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
e2fsck -b 8193 <device>

Selanjutnya kita perlu menemukan dimana backup superblock di simpan. 

sudo mke2fs -n /dev/xxx

Akan tampak daftar tempat backup 

Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208

Restore superblock dari backup, ganti xxx dengan nama partisi dan block_number dengan nomor backup. 

sudo e2fsck -b block_number /dev/xxx

Reboot, dan superblock harusnya fix.

Jika tidak, ulangi langkah di atas, tapi restore dari backup superblock lainnya.


Referensi

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