mkfs.nilfs2 - create a NILFS2 filesystem
mkfs -t nilfs2 [ -b block-size ] [ -B
blocks-per-segment ] [ -c ] [ -f ] [ -K ] [
-L volume-label ] [ -m
reserved-segments-percentage ] [ -n ] [ -O
feature[,...] ] [ -h ] [ -q ] [ -v ] [ -V
] device
mkfs.nilfs2 [ -b block-size ] [ -B
blocks-per-segment ] [ -c ] [ -f ] [ -K ] [
-L volume-label ] [ -m
reserved-segments-percentage ] [ -n ] [ -O
feature[,...] ] [ -h ] [ -q ] [ -v ] [ -V
] device
mkfs.nilfs2 is used to create a nilfs2 filesystem (usually
in a disk partition). device is the special file corresponding to the
device (e.g. /dev/sdXX). Usually mkfs.nilfs2 is invoked from
the mkfs(8) front-end program.
The exit code returned by mkfs.nilfs2 is 0 on success and 1
on failure.
- -b block-size
- Specify the size of blocks in bytes. The valid block size is 1024, 2048,
4096, 8192 bytes, ..., and the maximum block size is restricted to the
system page size. For most machines, it is 4096 bytes. The default block
size is 4096 bytes.
- -B
blocks-per-segment
- Specify the number of blocks in a segment, where the segment (also called
full segment) is an allocation unit of disk space of NILFS. This parameter
gives the size of segment and consequently determines how many segments
are aligned in the specified device. The default number of blocks per
segment is 2048 (= 8MB with 4KB blocks).
- -c
- Check the device for bad blocks before building the filesystem.
- -f
- Force overwrite when an existing filesystem is detected on the device. By
default, mkfs.nilfs2 will not write to the device if it suspects
that there is a filesystem on the device already.
- -h
- Display help message and exit.
- -K
- Keep, do not attempt to discard blocks at mkfs time (discarding blocks
initially is useful on solid state drives and sparse / thinly-provisioned
storage).
- -L
new-volume-label
- Set the volume label for the filesystem to new-volume-label.
The maximum length of the volume label is 80 bytes.
- -m
reserved-segments-percentage
- Specify the percentage of the segments reserved for garbage collection.
The default percentage is 5%.
- -n
- Cause mkfs.nilfs2 to not actually create a filesystem, but display
what it would be do if it were to create a filesystem.
- -O
feature[,...]
- Create a filesystem with the given features (filesystem options),
overriding the default filesystem options.
The filesystem feature set is comprised of a list of features,
separated by commas, that are to be enabled. To disable a feature,
simply prefix the feature name with a caret ('^') character. The
pseudo-filesystem feature "none" will clear all filesystem
features.
- -q
- Quiet execution. Useful if mkfs.nilfs2 is run in a script.
- -v
- Verbose execution.
- -V
- Print the version number of mkfs.nilfs2 and exit.
This version of mkfs.nilfs2 has been written by Ryusuke
Konishi <konishi.ryusuke@gmail.com>.
mkfs.nilfs2 is part of the nilfs-utils package and is
available from https://nilfs.sourceforge.io.