Juan Francisco Cantero Hurtado wrote on 2015/09/27 22:33 +0200:
kernel: 4.1.7
btrfs-progs: 4.2
mkfs.btrfs(8) man page says:
-d|--data <type>
Specify how the data must be spanned across the devices
specified. Valid values are raid0, raid1, raid5, raid6,
raid10 or single.
$ sudo mkfs.btrfs -d dup -m dup -M -O no-holes -f /dev/sdb1
SMALL VOLUME: forcing mixed metadata/data groups
btrfs-progs v4.2
See http://btrfs.wiki.kernel.org for more information.
Label: (null)
UUID: 29de8c3e-92da-4fe1-aa31-830c1068f532
Node size: 4096
Sector size: 4096
Filesystem size: 3.00GiB
Block group profiles:
Data+Metadata: DUP 161.56MiB
System: DUP 12.00MiB
SSD detected: no
Incompat features: mixed-bg, extref, skinny-metadata, no-holes
Number of devices: 1
Devices:
ID SIZE PATH
1 3.00GiB /dev/sdb1
The man page doesn't mention the option "-d dup". Am I missing something
or the man page is outdated?. The partition will contain two copies of
the data blocks?
-d dup is possible if and only if for mixed block group case, which
require data and metadata shares the same profile.
And yes, the partition will contains two copies of mixed chunk on disk,
which has data and metadata in it.
(Btrfs will store data and metadata into different chunks if not using
mixed block groups)
We're planning to add support for -d dup on single disk case, and will
update man page at that time.
Thanks,
Qu
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