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

       Jiro SEKIBA <jir@unicus.jp>

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

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.

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

-f     Force to modify even the specified file system is mounted.

       -iinterval
              Set the commit interval of segment.

       -mblock-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.

       -Lvolume-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.

       -UUUID
              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.

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

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

nilfs-tune [options] device