Re: Btrfs-progs: Update man page for mixed data+metadata option.

[Mitch Harder <mitch.harder@sabayonlinux.org>]

On Wed, Nov 10, 2010 at 8:10 PM, Josef Bacik <josef@redhat.com> wrote:
> On Wed, Nov 10, 2010 at 12:02:18PM -0600, Mitch Harder wrote:
>> Update the mkfs.btrfs man page for the -M option to mix data and
>> metadata chunks.
>>
>> Signed-off-by: Mitch Harder <mitch.harder@sabayonlinux.org>
>> ---
>> =A0man/mkfs.btrfs.8.in | =A0 =A05 +++++
>> =A01 files changed, 5 insertions(+), 0 deletions(-)
>>
>> diff --git a/man/mkfs.btrfs.8.in b/man/mkfs.btrfs.8.in
>> index 1e14c6c..c23dddc 100644
>> --- a/man/mkfs.btrfs.8.in
>> +++ b/man/mkfs.btrfs.8.in
>> @@ -9,6 +9,7 @@ mkfs.btrfs \- create an btrfs filesystem
>> =A0[ \fB \-l\fP\fI leafsize\fP ]
>> =A0[ \fB \-L\fP\fI label\fP ]
>> =A0[ \fB \-m\fP\fI metadata profile\fP ]
>> +[ \fB \-M\fP\fI mixed data+metadata\fP ]
>> =A0[ \fB \-n\fP\fI nodesize\fP ]
>> =A0[ \fB \-s\fP\fI sectorsize\fP ]
>> =A0[ \fB \-h\fP ]
>> @@ -45,6 +46,10 @@ Specify a label for the filesystem.
>> =A0Specify how metadata must be spanned across the devices specified=
=2E Valid
>> =A0values are raid0, raid1, raid10 or single.
>> =A0.TP
>> +\fB\-M\fR, \fB\-\-mixed\fR
>> +Mix data and metadata chunks together for more efficient space
>> +utilization.
>> +.TP
>> =A0\fB\-n\fR, \fB\-\-nodesize \fIsize\fR
>> =A0Specify the nodesize. By default the value is set to the pagesize=
=2E
>> =A0.TP
>> --
>> 1.7.2.2
>
> Let's mention that it's for smaller filesystems since it has a signif=
icant
> performance impact when using mixed block groups on larger filesystem=
s. =A0Thanks,
>
> Josef
>

OK, how about:

Mix data and metadata chunks together for more efficient space
utilization, especially on smaller file systems.  Incurs a performance
penalty.
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