{{tag>linux fsck format partition boot corrupt parted}}
=====fsck - file system check=====

Use fsck to check and repair a file system. **The file system must be unmounted when being check and repaired to prevent corruption!
**
====Checking Root File System====

The root file system can not be unmounted and checked. Two possible options to check the system are:

  *Force the Root Filesystem to use fsck during reboot, The Geek Stuff covers this well in, [[https://www.thegeekstuff.com/2016/03/forcefsck-on-reboot/ |How to Force Check Root Filesystem using fsck During Reboot]]. A summary of key commands:
  *The Root file system is automatically checked at certain intervals. To check this: ''sudo tune2fs -l /dev/sda1 | grep -i check''.
  *[[http://www.thegeekstuff.com/2016/03/forcefsck-on-reboot/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+TheGeekStuff+(The+Geek+Stuff)|To force a recheck at the next reboot]], create the file forcefsck. At the next reboot a fsck will be performed and the forcefsck file removed. Commands:
     *''cd /''
     *''sudo touch forcefsck''
  *Boot the system to a rescue file system. From the rescue file system the main boot drive may then be checked with fsck. (Further details not given.)


====Some other file system tips:====

  *To check current mounted disks use ''df -h''
  *To check current disks use ''sudo fdisk -l''. (This is a disk partition command. Be careful with use.)
  *To check current disks use ''sudo parted -l''. (This is a disk partition command, more modern than fdisk. Be careful with use.)
  *To check directory size use ''sudo du %%--%%max-depth=1 %%--%%all -h''
  *The filesystem boot file is /etc/fstab, ''sudo vim /etc/fstab''. (Be careful with editing this.)
  *To check ext2/3/4 file system information and configuration of a partition ''sudo tune2fs -l /dev/sdX''

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*[[home_server:home_server_setup:summary]]
*[[home_server:home_server_setup:home_it_setup]]
*[[home_server:home_server_setup:Network_setup]]
*[[home_server:home_server_setup:kvm]]
*[[home_server:home_server_setup:vnc_setup]]
*[[home_server:home_server_setup:disk_check]]
*[[home_server:home_server_setup:other_services:index]]
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====Find Information on Hard disks====
The ‘’lsblk’’ command has a lot of information returned.
The ‘’tune2fs’’ command is used by the system administrator to change/modify tunable parameters on ext2, ext3 and ext4 type filesystems.  The command to display filesystem information is ‘’tune2fs -l /dev/sda2’’.  The ‘’df’’ command lists current mounted disks.


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  *''lsblk'' by itself give the basic drive partition and mount point information.
  *''lsblk -o NAME,MODEL,SERIAL,WWN,HCTL,MOUNTPOINT'' gives more comprehensive information: 
    *WWN is a unique identifier ode list on the drive
    *HCTL lists the drive sata port
  *''lsblk --help'' to list all the options