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or the man page is outdated?.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?
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