From: Forza <forza@tnonline.net>
To: remi@georgianit.com, Qu Wenruo <wqu@suse.com>,
Amit Shah <amit@infradead.org>,
linux-btrfs@vger.kernel.org
Subject: Re: Fixing a corrupted file system
Date: Thu, 2 Apr 2026 21:07:01 +0200 (GMT+02:00) [thread overview]
Message-ID: <87d1aca.ae41f579.19d4f977d95@tnonline.net> (raw)
In-Reply-To: <571fb6a8-d4e7-42ed-9f19-22962163918d@app.fastmail.com>
---- From: remi@georgianit.com -- Sent: 2026-04-02 - 20:32 ----
>
>
> On Wed, Apr 1, 2026, at 5:21 PM, Qu Wenruo wrote:
>
>>
>> Nope, btrfs will only try extra mirrors, but in your case your metadata
>> doesn't even have extra mirrors.
>> Which is not common, as the default btrfs mkfs profiles will go DUP for
>> metadata.
>
> I forget what mkfs version, but the default behaviour changed a few years ago so the default profile is Single on SSD's. (Correct me if this has since been reverted.) Something about the way SSD's copy on write, the DUP entries would end up on the same physical block, so the redundancy was not effective.
>
It is the reverse. Since btrfs-progs 5.15, the default was changed to DUP for single device fs.
https://github.com/kdave/btrfs-progs/commit/65181c273e67bd48d01fc79f00826dce38b93c4c
~ Forza
next prev parent reply other threads:[~2026-04-02 19:07 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-01 15:58 Fixing a corrupted file system Amit Shah
2026-04-01 21:21 ` Qu Wenruo
2026-04-02 18:18 ` Amit Shah
2026-04-02 18:32 ` remi
2026-04-02 18:52 ` Amit Shah
2026-04-02 19:07 ` Forza [this message]
2026-04-24 8:23 ` Ulli Horlacher
2026-04-24 12:49 ` Roman Mamedov
2026-04-24 18:10 ` How to corrupt a btrfs fs [was Re: Fixing a corrupted file system] Nicholas D Steeves
2026-04-24 18:16 ` Roman Mamedov
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