nilfs-tune

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.