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       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

       -l     List the contents of the file system superblock,  including  the
              current  values  of  the  parameters  that  can  be set via this

       -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

                     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:

       -h     Display help message and exit.


       Jiro SEKIBA <>


       nilfs-tune is part of the nilfs-utils package  and  is  available  from


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

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