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Date: Wed, 11 Dec 2013 01:33:16 +0200
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Subject: Re: Feature Req: "mkfs.btrfs -d dup" option on single device
From: Imran Geriskovan <imran.geriskovan@gmail.com>
To: Chris Murphy <lists@colorremedies.com>
Cc: linux-btrfs@vger.kernel.org
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>> Currently, if you want to protect your data against bit-rot on
>> a single device you must have 2 btrfs partitions and mount
>> them as Raid1.

> No this also works:
> mkfs.btrfs -d dup -m dup -M <device>

Thanks a lot.

I guess docs need an update:

https://btrfs.wiki.kernel.org/index.php/Mkfs.btrfs:
"-d": Data profile, values like metadata. EXCEPT DUP CANNOT BE USED

man mkfs.btrfs (btrfs-tools 0.19+20130705)
-d, --data type
              Specify  how  the data must be spanned across
              the devices specified. Valid values are raid0, raid1,
              raid5,  raid6,  raid10  or single.

Imran