Linux disk and File System Management (2) _ File system detection

File System Detection:

File system Detection Tool fsck is required because the hardware or software may also cause the computer to crash or suddenly shut down due to a power supply, which results in a file system error.

fsck Command

Check and repair a Linux filesystem
Detecting and repairing Linux file systems

Grammar:

fsck [-LRSAVRTMNP] [-C [FD]] [-t fstype] [filesystem ...] [--] [Fs-specific-options]

Fsck.type command:

View the file systems supported by fsck

[Email protected] test]# fsck[tab][tab]fsck fsck.btrfs fsck.cramfs fsck.ext2 fsck.ext3 FSCK.EXT4 Fsck.minix FSC K.xfs

Parameters:

-T: Specifies the file system for the detected partition

-A: Auto fix errors, do not always press Y to confirm

-R: report test data such as status, time consuming

-F: Force detection

-A: Scan the device one time according to/etc/fstab

-R: When detected, you can skip the mounted root directory, as detected by the-a scan list

Example:

[[Email protected] test]# fsck -t ext4 /dev/sdb5fsck from util-linux  2.23.2e2fsck 1.42.9  (28-dec-2013)/dev/sdb5: clean, 11/32768 files, 6353/ 131072 blocks[[email protected] test]#  #强制检测, add the-f parameter to display the detection process [[email protected] test ]# fsck -f -r -t ext4 /dev/sdb5fsck from util-linux 2.23.2e2fsck  1.42.9  (28-dec-2013) Pass 1: checking inodes, blocks, and sizespass  2: Checking directory structurePass 3: Checking directory  connectivitypass 4: checking reference countspass 5: checking group  summary information/dev/sdb5: 11/32768 files  (0.0% non-contiguous),  6353/131072  blocks/dev/sdb5: status 0, rss 1548, real 0.023808, user  0.001684, sys 0.007371

Attention:

1 when performing fsck, the detected partition needs to be in the unloaded state

2 typically does not use fsck for detection and may result in data loss

e2fsck : Inspection Repair tool (check a Linux ext2/ext3/ext4 file system) dedicated to the EXT series filesystem

Parameters:

-P: Automatically fix file system errors

-N: Do not modify the file system

-C: Detect bad blocks and add bad block list

-A: equivalent to-P

-F: Force detection

-Y: Auto Answer Yes

Example

#强制检测 [[email protected] test]# e2fsck-f/dev/sdb5e2fsck 1.42.9 (28-dec-2013) Pass 1:checking inodes, blocks, and Sizespas S 2:checking directory structurepass 3:checking directory connectivitypass 4:checking reference Countspass 5:checking Group summary information/dev/sdb5:11/32768 files (0.0% non-contiguous), 6353/131072 blocks# auto Fix error [[email protected] test]# e2fsck-p/dev/sdb5/dev/sdb5:clean, 11/32768 files, 6353/131072 blocks

When E2fsck detects mounted partitions: read-only Test

[Email protected] test]# e2fsck-n/dev/sda3e2fsck 1.42.9 (28-dec-2013) warning! /dev/sda3 is mounted. Warning:skipping Journal Recovery because doing a read-only filesystem Check./dev/sda3:clean, 11521/640848 files, 210961 /2560000 blocks

If there is any mistake, please correct me!

Thank you!

Linux disk and File System Management (2) _ File system detection