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fsck

  • fsck - Wikipedia #ril

    • The system utility fsck (file system consistency check) is a tool for checking the consistency of a file system in Unix and Unix-like operating systems, such as Linux, macOS, and FreeBSD.

      A similar command, CHKDSK, exists in Microsoft Windows and its ancestor, MS-DOS.

    • There is no agreed pronunciation. It can be pronounced "F-S-C-K", "F-S-check", "fizz-check", "F-sack", "fisk", "fishcake", "fizik", "F-sick", "F-sock", "F-sek", "feshk", the sibilant "fsk", "fix", "farsk" or "fusk".

  • How to use fsck to Find and Repair Disk Errors and Bad Sectors | Linode (2020-10-07) #ril

    What is fsck?

    • fsck, short for file system consistency check, is a utility that examines the file system for errors and attempts to repair them if possible. It uses a combination of built-in tools to check the disk and generates a report of its findings.
    • On some systems, fsck runs automatically after an unclean shutdown or after a certain number of reboots.

    When to Use fsck

    • Use fsck to check your file system if your system fails to boot, if files on a specific disk become corrupt, or if an attached drive does not act as expected. Unmount the disks you intend to work on before attempting to check or repair them.

      Caution: Unmount the target disk first. You risk corrupting your file system and losing data if you run fsck on an active disk.

    Unmount the Disk > Boot into Rescue Mode

    • If you are using fsck on a Linode, the easiest and safest way to unmount your disk is to use RESCUE MODE.

      Visit our Rescue and Rebuild guide for instructions on how to boot your Linode into Rescue Mode. If you’re working on a local machine, consider using the distribution’s recovery mode or a live distribution to avoid working on a mounted disk.

      fsck should be run only as a user with root permissions.

    Unmount the Disk > View Mounted Disks and Verify Disk Location

    • Run df to view a list of currently mounted disks. If you are using Rescue Mode, the disk you want to check should not be listed:

      df -h

    • Use fdisk to view disk locations:

      fdisk -l

      Copy the location of the target disk to use with the fsck command.

    Unmount the Disk > Manual Unmount

    • If you are working on a local machine, unmount the disk manually.

      Use umount to unmount the disk location copied in the previous step:

      umount /dev/sdb

    • If the disk is declared in /etc/fstab, change the mount point to none there as well.

    How to Check for Errors on a Disk

    • Run fsck on the target disk, using the desired options. This example checks all file systems (-A) on /dev/sdb:

      fsck -A /dev/sdb

  • Fsck Command in Linux (Repair File System) | Linuxize (2019-11-12) #ril