What is the difference between fsck during boot and the normal fsck done manually?

Solution Verified - Updated -

Issue

  1. As a test, the flesystem is broken by overwriting the primary superblock:

    dd if=/dev/zero of=/dev/vda3 bs=4096 count=1 seek=0

  2. The system is rebooted.

  3. During boot-up, fsck is run and as soon as it detects that the filesystem /dev/vd3 is corrupted, it drops the system into a maintenance shell.

  4. After providing the root password to login to the maintenance shell, a normal fsck fixes the filesystem.

    fsck /dev/vda3
  • What is the difference between the fsck run in Step-3 and the one run in Step-4.

Environment

  • Red Hat Enterprise Linux 6

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