Tune2fs

tune2fs used to show or modify file system parameters on ext4 filesystems

To modify ext4 for metadata checksums tune2fs -O metadata_csum

To disable ext4 metadata checksum: tune2fs -O ^metadata_csum

Show file system characteristics, use -l to show contents of superblock

# tune2fs -l /path/to/device 
# tune2fs -l /dev/sda25
# tune2fs -l /dev/[[cciss]]/c1d1p1
# tune2fs -l /dev/VG_NAME/LV_NAME
# tune2fs -l /dev/mapper/dm-path-name

tune2fs
tune2fs 1.44.1 (24-Mar-2018)
Usage: tune2fs [-c max_mounts_count] [-e errors_behavior] [-f] [-g group]
	[-i interval[d|m|w]] [-j] [-J journal_options] [-l]
	[-m reserved_blocks_percent] [-o [^]mount_options[,...]]
	[-r reserved_blocks_count] [-u user] [-C mount_count]
	[-L volume_label] [-M last_mounted_dir]
	[-O [^]feature[,...]] [-Q quota_options]
	[-E extended-option[,...]] [-T last_check_time] [-U UUID]
	[-I new_inode_size] [-z undo_file] device

Change reservation percentage

tune2fs -l /path/to/device | egrep "Reserved block count|Block size"
tune2fs -m 0 /path/to/device

Filesystem state:         clean
Filesystem state:         clean with errors
FS Error count:           61

First error time:         Wed Dec 11 15:40:41 2019
First error function:     htree_dirblock_to_tree
First error line #:       994
First error inode #:      2
First error block #:      0
Last error time:          Sun Dec 15 12:36:44 2019
Last error function:      ext4_find_entry
Last error line #:        1465
Last error inode #:       2
Last error block #:       0

Related terms

• df -kh
• fsck
• -cmax-mount-counts
• dumpe2fs

See also

• tune2fs, Reservation percentage, dumpe2fs
• du, du -hs, Disk space usage, df, ls, tree, find, docker system df, journalctl --disk-usage, No space left on device, ENOSPC, sar -F, growpart, resize2fs, ncdu, duf, dua-cli, macOS disk space
• file, File system, directory, touch, mkdir, ls, ln truncate, fallocate, split, stat, inode, File descriptor, superblock, block size (blockdev), fuser, lsof, scrub, chattr, ulimit (nofiles), cp, mv, file (command), mkfifo, chmod
• File systems: clustered file system, tune2fs mkfs.ext4,superblock, e2fsck, resize2fs, mount, df, umount, UUID, fstab

https://linux.die.net/man/8/tune2fs