1NILFS-TUNE(8)               System Manager's Manual              NILFS-TUNE(8)
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NAME

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

9       nilfs-tune [options] device
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DESCRIPTION

12       nilfs-tune  is  a  utility  to modify tunable file system parameters on
13       NILFS2 file system in device.
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15       This command is valid for  inactive  NILFS2  file  systems.   Modifying
16       active mounts may cause severe damage.
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OPTIONS

19       -f     Force to modify even the specified file system is mounted.
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21       -i interval
22              Set the commit interval of segment.
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24       -m block-max
25              Set  the  threshold  of the data amount of the segment construc‐
26              tion.
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28       -l     List the contents of the file system superblock,  including  the
29              current  values  of the parameters that can be set via this pro‐
30              gram.
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32       -L volume-label
33              Set the volume label of the file  system.   NILFS2  file  system
34              labels  can be at most 80 bytes long.  If volume-label is longer
35              than 80 bytes, nilfs-tune will truncate it.   The  volume  label
36              can  be used mount(8) and /etc/fstab(5) (and possibly others) by
37              specifying LABEL=volume-label instead of a block special  device
38              name like /dev/sda5.
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40       -O [^]feature[,...]
41              Set  or clear the indicated filesystem features (options) in the
42              filesystem.  More than one filesystem feature can be cleared  or
43              set  by  separating  features  with commas.  Filesystem features
44              prefixed with a caret character ('^') will  be  cleared  in  the
45              filesystem's  superblock;  filesystem  features without a prefix
46              character will be added to the filesystem.
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48              The following filesystem feature can be  set  or  cleared  using
49              nilfs-tune:
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51              block_count
52                     Enable  block  count  per checkpoint.  After setting this
53                     option, fsck should be run on the filesystem to make  the
54                     counts right, but no fsck tool is available yet, sorry.
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56       -U UUID
57              Set  the universally unique identifier (UUID) of the file system
58              to UUID.  The format of the UUID is a series of hex digits sepa‐
59              rated          by          hyphens,          like          this:
60              "c1b9d5a2-f162-11cf-9ece-0020afc76f16".
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62       -h     Display help message and exit.
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AUTHOR

65       Jiro SEKIBA <jir@unicus.jp>
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AVAILABILITY

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

72       nilfs(8), lscp(1), chcp(8), mkcp(8), rmcp(8).
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76nilfs-utils version 2.2            Apr 2014                      NILFS-TUNE(8)
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