nilfs-tune - adjust tunable file system parameters on NILFS file
system
nilfs-tune [options] device
nilfs-tune is a utility to modify tunable file system
parameters on NILFS2 file system in device.
This command is valid for inactive NILFS2 file systems. Modifying
active mounts may cause severe damage.
- -f
- Force to modify even the specified file system is mounted.
- -i interval
- Set the commit interval of segment.
- -m block-max
- Set the threshold of the data amount of the segment construction.
- -l
- List the contents of the file system superblock, including the current
values of the parameters that can be set via this program.
- -L
volume-label
- Set the volume label of the file system. NILFS2 file system labels can be
at most 80 bytes long. If volume-label is longer than 80 bytes, nilfs-tune
will truncate it. The volume label can be used mount(8) and /etc/fstab(5)
(and possibly others) by specifying LABEL=volume-label instead of a
block special device name like /dev/sda5.
- -O
[^]feature[,...]
- Set or clear the indicated filesystem features (options) in the
filesystem. More than one filesystem feature can be cleared or set by
separating features with commas. Filesystem features prefixed with a caret
character ('^') will be cleared in the filesystem's superblock; filesystem
features without a prefix character will be added to the filesystem.
- The following filesystem feature can be set or cleared using
nilfs-tune:
- block_count
- Enable block count per checkpoint. After setting this option, fsck should
be run on the filesystem to make the counts right, but no fsck tool is
available yet, sorry.
- -U UUID
- Set the universally unique identifier (UUID) of the file system to UUID.
The format of the UUID is a series of hex digits separated by hyphens,
like this: "c1b9d5a2-f162-11cf-9ece-0020afc76f16".
- -h
- Display help message and exit.
Jiro SEKIBA <jir@unicus.jp>
nilfs-tune is part of the nilfs-utils package and is
available from https://nilfs.sourceforge.io.