GNU bug report logs - #51427
[PATCH] nix: libstore: Do not remove unused links when deleting specific items.

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From: Jack Hill <jackhill <at> jackhill.us>
To: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
Cc: 51427 <at> debbugs.gnu.org, Ludovic Courtès <ludo <at> gnu.org>, Liliana Marie Prikler <liliana.prikler <at> gmail.com>
Subject: [bug#51427] [PATCH] nix: libstore: Do not remove unused links when deleting specific items.
Date: Mon, 8 Nov 2021 23:57:23 -0500 (EST)

[Message part 1 (text/plain, inline)]

On Mon, 8 Nov 2021, Maxim Cournoyer wrote:

> Ludovic Courtès <ludo <at> gnu.org> writes:
>
>> BTW, those using Btrfs can probably use ‘--disable-deduplication’ and be
>> done with it.
>
> I erroneously used to think that Btrfs could do live deduplication, but
> it doesn't.  There are external tools to do out of band / batch
> deduplication though [0]; so if they perform better than the guix daemon's
> own dedup, perhaps we could document this way out for our Btrfs users.
>
> [0]  https://btrfs.wiki.kernel.org/index.php/Deduplication

A little while ago I had hoped to test btrfs with --disable-deduplication 
and bees [1] as the deduplication agent, but wasn't able to successfully 
run a system with --disable-deduplication because I needed the 
deduplication to cover up problem with grafts [2]. Until we resolve the 
second issue, I don't think we should recommend folks run the daemon with 
--disable-deduplication.

[1] https://issues.guix.gnu.org/47983 (still missing a service)
[2] https://issues.guix.gnu.org/47115

Best,
Jack

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