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Date: Tue, 23 Oct 2012 20:49:32 +0200
From: =?iso-8859-1?Q?Llu=EDs?= Batlle i Rossell <viric@viric.name>
To: Btrfs mailing list <linux-btrfs@vger.kernel.org>
Subject: Between single/dup and raid1/raid1
Message-ID: <20121023184932.GK2052@vicerveza.homeunix.net>
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Hello,

today I wanted to remove one drive from raid1, and people at #btrfs advised me
to use '-dconvert=single' before 'btrfs device delete'.

I thought of adding '-mconvert=dup' too, but the kernel does not let me do that.

It looks like 'dup' is disallowed for an array of multiple devices. So, to go
back to a single-drive (single/dup) setup, should I go through having the
metadata with 'single' profile?

I can't use 'btrfs device delete' either, because that wouldn't respesct the
raid1 profile.

Maybe then the easiest I could do is to use the computer degraded, until I get
some new disk in some days? That'd be equivalent to metadata=single, as I
understand.

And having a totally new disk, having removed the broken one, I'd have to:
1) mount degraded
2) btrfs device delete the missing disk (will I be allowed? due to raid1 profile)
3) btrfs device add another disk

Should that work?

Regards,
Lluís.