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attempt to read block from filesystem resulted in short read could this be a zero length partition

 

 

ما هي ال Linux Distribution التي تستخدمها ؟

ما هي ال Linux Distribution التي تستخدمها ؟

  ياريت لو حضرتك تفيدني       REDHAT 7.2

Environment

• Red Hat Enterprise Linux (RHEL) 6.

Issue

• While executing e2fsck on ext4 file system it complains about short read block.
• dumpe2fs also showing error while issuing it.

Resolution

• Find the alternate superblock using dumpe2fs. If it gives error then use mke2fs to find the alternate superblock.

   

  Raw

• # mke2fs -n /dev/mapper/testvg1-testp1

  Run the filesystem check using alternate superblock we got from previous output.

   

  Raw

• # e2fsck -fy -b <Alternate superblock> /dev/mapper/testvg1-testp1

  If you are not able to recover the superblocks with the above commands, then as a last resort try the mke2fs as mentioned below.

   

  Raw

# mke2fs -S -b <block size> /dev/mapper/testvg1-testp1

Root Cause

• Primary superblock seems to be corrupted.

Diagnostic Steps

• While running e2fsck below error was coming.

 

Raw

# e2fsck -fy /dev/mapper/testvg1-testp1
e2fsck 1.41.12 (17 May-2010)
e2fsck: Attempt to read block from filesystem resulted in short read while trying to open /dev/mapper/testvg1-testp1
Could this be zero-length partition?

• Tried to run the dumpe2fs command to check the alternate subperblock information.

 

Raw

# dumpe2fs /dev/mapper/testvg1-testp1
dump2efs Attempt to read block from filesystem resulted in short read while trying to open /dev/mapper/testvg1-testp1

• Ran the mke2fs command to get the superblock information.

 

Raw

# mke2fs -n /dev/mapper/testvg1-testp1

• Used the alternate superblock which we got from previous command to run the filesystem check. Use all the alternate superblocks until one succeeds.

 

Raw

# e2fsck -fy -b 32768 /dev/mapper/testvg1-testp1

• If none of the superblocks are recoverable from the above commands, then as a last resort you can use the below command.

 

Raw

# mke2fs -S -b <block size> /dev/mapper/testvg1-testp1

Note: The above command is useful if all of the superblock and backup superblocks are corrupted, and a last sort of recovery method is desired. It causes mke2fs to reinitialize the superblock and group descriptors, while not touching the inode table and the block and inode bitmaps. The e2fsck program should be run immediately after this option is used, and there is no guarantee that any data will be salvageable. It is critical to specify the correct filesystem blocksize when using this option, or there is no chance of recovery. Refer to man mke2fs for more details.

 

 

المرجع

https://access.redhat.com/solutions/1337143

 

كان هذا Verified solution من RedHat لكنه ليس ل7.2 وانما هو ل 6

لاحظ الRoot Cause 

Primary superblock seems to be corrupted.

•  

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