From: Daniel Kral <d.kral@proxmox.com>
To: Fabio Fantoni <fabio.fantoni@m2r.biz>,
Proxmox VE development discussion <pve-devel@lists.proxmox.com>
Subject: Re: [pve-devel] [RFC PATCH 2/2] common: btrfs: lower minimum amount of disks for raid10 to 2
Date: Wed, 15 Jan 2025 10:00:03 +0100 [thread overview]
Message-ID: <0472416b-6e05-4793-876f-cc679fccf70f@proxmox.com> (raw)
In-Reply-To: <0999b2e1-8b8b-4baf-84d6-32251a675338@m2r.biz>
On 1/13/25 13:24, Fabio Fantoni wrote:
> btrfs profiles work differently but other hardware or software raids,
> many users may not inform themselves well beforehand but even in the
> case of informed users even if technically now btrfs allows lower limits
> with the creation of raid 0 (and raid10) I think it would be better to
> keep them at the base at the creation and then it must be the user who
> consciously makes any subsequent conversions.
Hm, I'm still unsure about this, because AFAIK we already allow creating
ZFS RAID0 with a single disk, which technically also isn't a "real"
RAID0 setup itself. But fair point for RAID10, it could be irritating
for users to have a discrepancy between the minimum disk amount of ZFS
and BTRFS RAID10 and it'd be a bit harder to communicate that in a
understandable manner.
>
> regarding btrfs profiles at creation, one thing that could be useful is
> to always put duplicate metadata (dup with single disk or raid 1 in the
> case of raid0), if you don't want it by default maybe put it as an
> additional option, and if you don't want that either at least add it to
> the documentation (as a suggestion if you want greater resilience of the
> filesystem without consuming excessive space)
Currently, the installer creates the BTRFS filesystem with the data and
metadata both using the same profile. I also think it could be valuable
to have an "advanced" option, which allows to set a separate profile for
the metadata.
Feel free to send either a RFC for it (even if I can't tell you whether
it will be accepted as it adds some complexity to the fs setup) or
create a Bugzilla so also other users and developers can discuss it.
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next prev parent reply other threads:[~2025-01-15 9:00 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-01-10 17:00 [pve-devel] [RFC PATCH 1/2] install: btrfs: fix raid level falling back to single mode Daniel Kral
2025-01-10 17:00 ` [pve-devel] [RFC PATCH 2/2] common: btrfs: lower minimum amount of disks for raid10 to 2 Daniel Kral
2025-01-13 12:24 ` Fabio Fantoni via pve-devel
[not found] ` <0999b2e1-8b8b-4baf-84d6-32251a675338@m2r.biz>
2025-01-15 9:00 ` Daniel Kral [this message]
2025-01-15 16:14 ` Fabio Fantoni via pve-devel
2025-01-13 12:15 ` [pve-devel] [RFC PATCH 1/2] install: btrfs: fix raid level falling back to single mode Fabio Fantoni via pve-devel
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