.TH MKFS.BTRFS 8
.SH NAME
mkfs.btrfs \- create an btrfs filesystem
.SH SYNOPSIS
.B mkfs.btrfs
[ \fB\-A\fP\fI alloc-start\fP ]
[ \fB\-b\fP\fI byte-count\fP ]
[ \fB \-d\fP\fI data-profile\fP ]
[ \fB \-l\fP\fI leafsize\fP ]
[ \fB \-L\fP\fI label\fP ]
[ \fB \-m\fP\fI metadata profile\fP ]
[ \fB \-M\fP\fI mixed data+metadata\fP ]
[ \fB \-n\fP\fI nodesize\fP ]
[ \fB \-s\fP\fI sectorsize\fP ]
[ \fB \-h\fP ]
[ \fB \-V\fP ] \fI device\fP [ \fI device ...\fP ]
.SH DESCRIPTION
.B mkfs.btrfs
is used to create an btrfs filesystem (usually in a disk partition, or an array
of disk partitions).
.I device
is the special file corresponding to the device (e.g \fI/dev/sdXX\fP ).
If multiple \fI devices \fP are specified, btrfs is created
spanning across the specified \fI devices\fP.
.SH OPTIONS
.TP
\fB\-A\fR, \fB\-\-alloc\-start \fIoffset\fR
Specify the offset from the start of the device to start the btrfs filesystem. The default value is zero, or the start of the device.
.TP
\fB\-b\fR, \fB\-\-byte\-count \fIsize\fR
Specify the size of the resultant filesystem. If this option is not used,
mkfs.btrfs uses all the available storage for the filesystem.
.TP
\fB\-d\fR, \fB\-\-data \fItype\fR
Specify how the data must be spanned across the devices specified. Valid
values are raid0, raid1, raid10 or single.
.TP
\fB\-l\fR, \fB\-\-leafsize \fIsize\fR
Specify the leaf size, the least data item in which btrfs stores data. The
default value is the page size.
.TP
\fB\-L\fR, \fB\-\-label \fIname\fR
Specify a label for the filesystem.
.TP
\fB\-m\fR, \fB\-\-metadata \fIprofile\fR
Specify how metadata must be spanned across the devices specified. Valid
values are raid0, raid1, raid10 or single.
.TP
\fB\-M\fR, \fB\-\-mixed\fR
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.
.TP
\fB\-n\fR, \fB\-\-nodesize \fIsize\fR
Specify the nodesize. By default the value is set to the pagesize.
.TP
\fB\-s\fR, \fB\-\-sectorsize \fIsize\fR
Specify the sectorsize, the minimum block allocation.
.TP
\fB\-V\fR, \fB\-\-version\fR
Print the \fBmkfs.btrfs\fP version and exit.
.SH AVAILABILITY
.B mkfs.btrfs
is part of btrfs-progs. Btrfs is currently under heavy development,
and not suitable for any uses other than benchmarking and review.
Please refer to the btrfs wiki
http://btrfs.wiki.kernel.org for further details.
.SH SEE ALSO
.BR btrfsck (8)