tune2fs.8.in revision a789d8406070224503c9ab78040acc7ea80c65ae
Revision 1.0 93/06/3 23:00 chk
Initial revision


TUNE2FS 8 "@E2FSPROGS_MONTH@ @E2FSPROGS_YEAR@" "E2fsprogs version @E2FSPROGS_VERSION@"
NAME
tune2fs - adjust tunable filesystem parameters on second extended filesystems
SYNOPSIS
tune2fs [ -l ] [ -c max-mount-counts ] [ -e errors-behavior ] [ -i interval-between-checks ] [ -m reserved-blocks-percentage ] [ -r reserved-blocks-count ] [ -s sparse-super-flag ] [ -u user ] [ -g group ] [ -C mount-count ] [ -L volume-name ] [ -M last-mounted-directory ] [ -U UUID ] device
DESCRIPTION
tune2fs adjusts tunable filesystem parameters on a Linux second extended filesystem.

Never use tune2fs to change parameters of a read/write mounted filesystem!

OPTIONS

-c max-mount-counts adjust the maximal mounts count between two filesystem checks.

-e error-behavior change the behavior of the kernel code when errors are detected. error-behavior can be one of the following:

\ continue\ \ Continue normal execution.

\ remount-ro\ Remount the filesystem read-only.

\ panic\ \ Cause a kernel panic.

-g group set the user group which can benefit from the reserved blocks.

group can be a numerical gid or a group name.

-i interval-between-checks[d|m|w] adjust the maximal time between two filesystem checks. No postfix or `d' result in days, `m' in months, and `w' in weeks. A value of zero will disable the timedependent checking.

-l list the contents of the filesystem superblock.

-m reserved-blocks-percentage adjust the reserved blocks percentage on the given device.

-r reserved-blocks-count adjust the reserved blocks count on the given device.

-s sparse_super_flag set or reset the sparse_superblock flag. The sparse_superblock feature saves space on really big filesystems. Warning: The Linux 2.0 kernel does not properly support this feature. Neither do all Linux 2.1 kernels; please don't use this unless you know what you're doing!

-u user set the user who can benefit from the reserved blocks. user can be a numerical uid or a user name.

-C mount-count set the number of times the filesystem has been mounted.

-L volume-label set the volume label of the filesystem. Ext2 filesystem labels can be at most 16 characters long; if volume-label is longer than 16 characters, tune2fs will truncate it and print a warning message.

-M last-mounted-directory set the last-mounted directory for the filesystem.

-U UUID set the UUID of the filesystem. A sample UUID looks like this: "c1b9d5a2-f162-11cf-9ece-0020afc76f16". The uuid may also be "null", which will set the filesystem UUID to the null UUID. The uuid may also be "random", which will generate a new random UUID for the filesystem.

BUGS
We haven't found any bugs yet. Perhaps there are bugs but it's unlikely.

WARNING
Use this utility at your own risk. You're modifying a filesystem!
AUTHOR
tune2fs was written by Remy Card <card@masi.ibp.fr>, the developer and maintainer of the ext2 fs.

tune2fs uses the ext2fs library written by Theodore Ts'o <tytso@mit.edu>.

This manual page was written by Christian Kuhtz <chk@data-hh.Hanse.DE>.

Timedependent checking was added by Uwe Ohse <uwe@tirka.gun.de>.

AVAILABILITY
tune2fs is part of the e2fsprogs package and is available for anonymous ftp from tsx-11.mit.edu in /pub/linux/packages/ext2fs.
SEE ALSO
dumpe2fs (8), e2fsck (8), mke2fs (8)