1NILFS-TUNE(8) System Manager's Manual NILFS-TUNE(8)
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6 nilfs-tune - adjust tunable file system parameters on NILFS file system
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9 nilfs-tune [options] device
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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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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‐
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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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65 Jiro SEKIBA <jir@unicus.jp>
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68 nilfs-tune is part of the nilfs-utils package and is available from
69 https://nilfs.sourceforge.io.
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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)