FSCK
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FSCK (File System Consistency Check)
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What does FSCK do?
fsck (file system consistency check) is a system utility used to check and repair filesystems. FSCK is made up of various tools that are made to handle different filesystem types, these are stored within /usr/sbin:
lrwxrwxrwx 1 root root 8 Mar 23 2022 dosfsck -> fsck.fat
-rwxr-xr-x 1 root root 360280 Jun 1 2022 e2fsck
-rwxr-xr-x 1 root root 43440 Apr 9 15:32 fsck
-rwxr-xr-x 1 root root 1185 Feb 24 2022 fsck.btrfs
-rwxr-xr-x 1 root root 31168 Apr 9 15:32 fsck.cramfs
lrwxrwxrwx 1 root root 6 Jun 1 2022 fsck.ext2 -> e2fsck
lrwxrwxrwx 1 root root 6 Jun 1 2022 fsck.ext3 -> e2fsck
lrwxrwxrwx 1 root root 6 Jun 1 2022 fsck.ext4 -> e2fsck
-rwxr-xr-x 1 root root 84360 Mar 23 2022 fsck.fat
-rwxr-xr-x 1 root root 55712 Apr 9 15:32 fsck.minix
lrwxrwxrwx 1 root root 8 Mar 23 2022 fsck.msdos -> fsck.fat
lrwxrwxrwx 1 root root 8 Mar 23 2022 fsck.vfat -> fsck.fat
-rwxr-xr-x 1 root root 1968 Feb 9 2022 fsck.xfs
-rwxr-xr-x 1 root root 51592 Nov 1 2022 ntfsclone
-rwxr-xr-x 1 root root 35200 Nov 1 2022 ntfscpPurpose of fsck
- Checking Filesystem Integrity: It scans the filesystem for inconsistencies and potential errors, such as corrupted metadata, lost clusters, and bad sectors.
- Repairing Errors:
fsckcan fix detected issues to prevent data loss and improve system stability.
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You can only run a filesystem check on an unmounted disk.
Scanning a specific disk (optional repair):
fsck -t ext4 /dev/sda2Scanning all disks (optional repair)
fsck -AFSCK Options:
| -A | Check all filesystems. |
| -t [option] | Specify filesystem type |
| -y | Automatically attempt to fix any errors without user prompt |
| -n | Do not attempt to repair |
| -f | Forces a check, even if the filesystem appears to be fine |
| -T | Skip mounted filesystems |
| -R | Skip the root filesystem |
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FSCK on boot
FSCK can be configured to run for each filesystem when the server boots. For more info see here.
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