On Wed, Nov 10, 2010 at 9:53 PM, Mitch Harder <mitch.harder@xxxxxxxxxxxxxxxx> wrote: > On Wed, Nov 10, 2010 at 8:10 PM, Josef Bacik <josef@xxxxxxxxxx> 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@xxxxxxxxxxxxxxxx> >>> --- >>> man/mkfs.btrfs.8.in | 5 +++++ >>> 1 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 >>> [ \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 ] >>> @@ -45,6 +46,10 @@ Specify a label for the filesystem. >>> 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. >>> +.TP >>> \fB\-n\fR, \fB\-\-nodesize \fIsize\fR >>> Specify the nodesize. By default the value is set to the pagesize. >>> .TP >>> -- >>> 1.7.2.2 >> >> Let's mention that it's for smaller filesystems since it has a significant >> performance impact when using mixed block groups on larger filesystems. Thanks, >> >> Josef >> > > OK, how about: > > Mix data and metadata chunks together for more efficient space > utilization, especially on smaller file systems. Incurs a performance > penalty. in a previous message, Josef had mentioned it was specifically for <1GB _only_... if so, wording should probably make it perfectly clear that the option is totally inappropriate for _anybody_ unless you meet specific/special criteria. something like DANGER DANGER WILL ROBINSON :-) unless i'm mistaken of course. C Anthony -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
