[pve-devel] applied: [RFC PATCH installer] proxinstall, common: remove deprecated fletcher2 as zfs checksum algorithm

Thomas Lamprecht t.lamprecht at proxmox.com
Tue Feb 6 13:17:57 CET 2024

Am 22/12/2023 um 11:52 schrieb Christoph Heiss:
> Fletcher-2 has long been deprecated and should not be used anymore
> [0][1], so we probably should not offer it anymore too. It's been
> deprecated since at least over 3 years, beyond that it's hard to find an
> exact date.
> Signed-off-by: Christoph Heiss <c.heiss at proxmox.com>
> [0] https://openzfs.github.io/openzfs-docs/Basic%20Concepts/Checksums.html#checksum-algorithms
> [1] https://people.freebsd.org/~asomers/fletcher.pdf

please keep the git-trailes, like your S-o-b, always at the bottom.
References like these above are part of the commit message, not the
Developer Certificate of Origin S-o-b or patch meta stuff like R-b
or T-b trailers.

> ---
> Sending this as RFC since it might warrant some discussions.
> While digging into this a bit more, I reckon we should remove 'off' as
> an option too. It's considered an "extraordinarily bad idea" [2] (for to
> pretty obvious reason) and nobody should ever use it.
> Might be a good idea, just so that users simply disable checksum "for
> performance reasons" without knowing about the implications of this.

yeah, would make sense, especially as anybody can still disable those
afterwards using the `zfs` CLI tool, for whatever reason that may be.

The alternative would be either showing a hint if `off` is selected,
or change the combobox entry label of it to something like:
`off (NOT recommended)`

But just to mention all options, I'm fine with this being dropped,
if lots of users complain with somewhat reasonable justification then
we could always re-add it with aforementioned hint.

> [2] https://openzfs.github.io/openzfs-docs/Basic%20Concepts/Checksums.html#disabling-checksums
>  proxinstall                             | 2 +-
>  proxmox-installer-common/src/options.rs | 3 +--
>  2 files changed, 2 insertions(+), 3 deletions(-)

applied, thanks! 

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