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Subject: Re: How to change BTRFS filesystem UUID
To: Jiri Kanicky <j@ganomi.com>, linux-btrfs@vger.kernel.org
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Date: Sun, 27 Dec 2015 15:48:06 +0100
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On 12/27/15 15:31, Jiri Kanicky wrote:
> Is there a way to change the BTRFS ID (generate new one) that I can
> differentiate between the two disks on one host?

btrfstune:

    -u
       Change fsid to a randomly generated UUID or continue previous
       fsid change operation in case it was interrupted.

should do what you need.

-h