TUNE2FS (8)
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
]
[
-O
[^]feature[,...]
]
[
-U
UUID
]
device
DESCRIPTION
tune2fs
adjusts tunable filesystem parameters on a Linux second extended 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 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\fR[\fBd\fR|\fBm\fR|\fBw\fR]
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.
-O \fR[^]\fIfeature\fR[,...]
set or clear the indicated filesystem features (options) in the filesystem.
Feature
can be one of the following supported filesystem options:
sparse ,
which cause the filesystem to use sparse superblocks, and
filetype ,
which will cause the filesystem to store file type information in
directory entries. After setting or clearing either filesystem feature,
e2fsck must be run on 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
Never use tune2fs to change parameters of a read/write mounted filesystem!
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
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