Re: [PATCH v2.1] btrfs: ensure that a DUP or RAID1 block group has exactly two stripes

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Subject: Re: [PATCH v2.1] btrfs: ensure that a DUP or RAID1 block group has exactly two stripes
From: David Sterba <dsterba@xxxxxxx>
Date: Tue, 19 Feb 2019 18:54:21 +0100
Cc: Johannes Thumshirn <jthumshirn@xxxxxxx>, David Sterba <dsterba@xxxxxxxx>, Linux BTRFS Mailinglist <linux-btrfs@xxxxxxxxxxxxxxx>, Nikolay Borisov <nborisov@xxxxxxxx>, Qu Wenruo <wqu@xxxxxxxx>, Hans van Kranenburg <Hans.van.Kranenburg@xxxxxxxxxx>, Liu Bo <obuil.liubo@xxxxxxxxx>
In-reply-to: <CAEtw4r2tHWRNSOP6OiAfBHPdGpwZsckL9KOd3vkogDAk+gsz8Q@mail.gmail.com>
Mail-followup-to: dsterba@xxxxxxx, Peter Becker <floyd.net@xxxxxxxxx>, Johannes Thumshirn <jthumshirn@xxxxxxx>, David Sterba <dsterba@xxxxxxxx>, Linux BTRFS Mailinglist <linux-btrfs@xxxxxxxxxxxxxxx>, Nikolay Borisov <nborisov@xxxxxxxx>, Qu Wenruo <wqu@xxxxxxxx>, Hans van Kranenburg <Hans.van.Kranenburg@xxxxxxxxxx>, Liu Bo <obuil.liubo@xxxxxxxxx>
References: <210585b9-99e9-1548-f2b1-66445ab179bb@suse.de> <20190218102837.15219-1-jthumshirn@suse.de> <CAEtw4r2tHWRNSOP6OiAfBHPdGpwZsckL9KOd3vkogDAk+gsz8Q@mail.gmail.com>
Reply-to: dsterba@xxxxxxx
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On Tue, Feb 19, 2019 at 08:33:23AM +0100, Peter Becker wrote:
> I would prefer "< 2" .. in both cases (RAID1 and DUP) because this
> allow us to implement N-Copy RAID1 in the future.

The n-copy raid has or will have own block group type so there will be a
separate check for the constraints.

References:
- Re: [PATCH v2] btrfs: ensure that a DUP or RAID1 block group has exactly two stripes
  - From: Johannes Thumshirn
- [PATCH v2.1] btrfs: ensure that a DUP or RAID1 block group has exactly two stripes
  - From: Johannes Thumshirn
- Re: [PATCH v2.1] btrfs: ensure that a DUP or RAID1 block group has exactly two stripes
  - From: Peter Becker

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