NILFS-TUNE(8)               System Manager's Manual              NILFS-TUNE(8)

NAME
       nilfs-tune - adjust tunable file system parameters on NILFS file system

SYNOPSIS
       nilfs-tune [options] device

DESCRIPTION
       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.

OPTIONS
       -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.

AUTHOR
       Jiro SEKIBA <jir@unicus.jp>

AVAILABILITY
       nilfs-tune is part of the nilfs-utils package and is available from
       https://nilfs.sourceforge.io.

SEE ALSO
       nilfs(8), lscp(1), chcp(8), mkcp(8), rmcp(8).

nilfs-utils version 2.2            Apr 2014                      NILFS-TUNE(8)