141 lines
4.1 KiB
Plaintext
141 lines
4.1 KiB
Plaintext
mkfs.btrfs(8)
|
|
=============
|
|
|
|
NAME
|
|
----
|
|
mkfs.btrfs - create a btrfs filesystem
|
|
|
|
SYNOPSIS
|
|
--------
|
|
*mkfs.btrfs*
|
|
$$[-A|--alloc-start <alloc-start>]$$
|
|
$$[-b|--byte-count <byte-count>]$$
|
|
$$[-d|--data <data-profile>]$$
|
|
$$[-f|--force]$$
|
|
$$[-n|--nodesize <nodesize>]$$
|
|
$$[-l|--leafsize <leafsize>]$$
|
|
$$[-L|--label <label>]$$
|
|
$$[-m|--metadata <metadata profile>]$$
|
|
$$[-M|--mixed]$$
|
|
$$[-s|--sectorsize <sectorsize>]$$
|
|
$$[-r|--rootdir <rootdir>]$$
|
|
$$[-K|--nodiscard]$$
|
|
$$[-O|--features <feature1>[,<feature2>...]]$$
|
|
$$[-U|--uuid <UUID>]$$
|
|
$$[-h]$$
|
|
$$[-V|--version]$$
|
|
$$<device> [<device>...]$$
|
|
|
|
DESCRIPTION
|
|
-----------
|
|
*mkfs.btrfs*
|
|
is used to create a btrfs filesystem (usually in a disk partition, or an array
|
|
of disk partitions).
|
|
|
|
<device>
|
|
is the special file corresponding to the device (e.g /dev/sdXX ).
|
|
If multiple devices are specified, btrfs is created
|
|
spanning across the specified devices.
|
|
|
|
OPTIONS
|
|
-------
|
|
-A|--alloc-start <offset>::
|
|
Specify the offset from the start of the device at which to start allocations
|
|
in this btrfs filesystem. The default value is zero, or the start of the
|
|
device. This option is intended only for debugging filesystem resize
|
|
operations.
|
|
|
|
-b|--byte-count <size>::
|
|
Specify the size of the resultant filesystem. If this option is not used,
|
|
mkfs.btrfs uses all the available storage for the filesystem.
|
|
|
|
-d|--data <type>::
|
|
Specify how the data must be spanned across the devices specified. Valid
|
|
values are 'raid0', 'raid1', 'raid5', 'raid6', 'raid10' or 'single'.
|
|
|
|
-f|--force::
|
|
Force overwrite when an existing filesystem is detected on the device.
|
|
By default, mkfs.btrfs will not write to the device if it suspects that
|
|
there is a filesystem or partition table on the device already.
|
|
|
|
-l|--leafsize <size>::
|
|
Alias for --nodesize. Deprecated.
|
|
|
|
-n|--nodesize <size>::
|
|
Specify the nodesize, the tree block size in which btrfs stores
|
|
data. The default value is 16KB (16384) or the page size, whichever is
|
|
bigger. Must be a multiple of the sectorsize, but not larger than 65536.
|
|
Leafsize always equals nodesize and the options are aliases.
|
|
|
|
-L|--label <name>::
|
|
Specify a label for the filesystem.
|
|
+
|
|
NOTE: <name> should be less than 256 characters.
|
|
|
|
-m|--metadata <profile>::
|
|
Specify how metadata must be spanned across the devices specified. Valid
|
|
values are 'raid0', 'raid1', 'raid5', 'raid6', 'raid10', 'single' or 'dup'.
|
|
+
|
|
Single device
|
|
will have dup set by default except in the case of SSDs which will default to
|
|
single. This is because SSDs can remap blocks internally so duplicate blocks
|
|
could end up in the same erase block which negates the benefits of doing
|
|
metadata duplication.
|
|
|
|
-M|--mixed::
|
|
Mix data and metadata chunks together for more efficient space
|
|
utilization. This feature incurs a performance penalty in
|
|
larger filesystems. It is recommended for use with filesystems
|
|
of 1 GiB or smaller.
|
|
|
|
-s|--sectorsize <size>::
|
|
Specify the sectorsize, the minimum data block allocation unit.
|
|
+
|
|
The default
|
|
value is the page size. If the sectorsize differs from the page size, the
|
|
created filesystem may not be mountable by current kernel. Therefore it is not
|
|
recommended to use this option unless you are going to mount it on a system
|
|
with the appropriate page size.
|
|
|
|
-r|--rootdir <rootdir>::
|
|
Specify a directory to copy into the newly created btrfs filesystem.
|
|
+
|
|
NOTE: '-r' option is done completely in userland, and don't need root
|
|
privilege to mount the filesystem.
|
|
|
|
-K|--nodiscard::
|
|
Do not perform whole device TRIM operation by default.
|
|
|
|
-O|--features <feature1>[,<feature2>...]::
|
|
A list of filesystem features turned on at mkfs time. Not all features are
|
|
supported by old kernels.
|
|
+
|
|
To see all features run:
|
|
+
|
|
+mkfs.btrfs -O list-all+
|
|
|
|
-U|--uuid <UUID>::
|
|
Create the filesystem with the specified UUID, which must not already exist on
|
|
the system.
|
|
|
|
-V|--version::
|
|
Print the *mkfs.btrfs* version and exit.
|
|
|
|
-h::
|
|
Print help.
|
|
|
|
UNIT
|
|
----
|
|
As default the unit is the byte, however it is possible to append a suffix
|
|
to the arguments like 'k' for KBytes, 'm' for MBytes...
|
|
|
|
AVAILABILITY
|
|
------------
|
|
*btrfs* is part of btrfs-progs.
|
|
Please refer to the btrfs wiki http://btrfs.wiki.kernel.org for
|
|
further details.
|
|
|
|
SEE ALSO
|
|
--------
|
|
`btrfs`(8)
|