Re: ZFS in Buster

From	Mo Zhou <lumin@debian.org>
Newsgroups	linux.debian.devel
Subject	Re: ZFS in Buster
Date	2019-06-03 16:50 +0200
Message-ID	<y4WrE-3ZB-15@gated-at.bofh.it> (permalink)
References	<y2Nsu-51T-3@gated-at.bofh.it> <y2Puj-6fO-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Hi Dan and Jonathan,

On 2019-05-28 18:49, Jonathan Carter wrote:
> On 2019/05/28 18:43, Dan wrote:
>> ZFS 0.8 has been released with lots of improvements, notably encryption.
> Yep, it's an exciting feature.

I've already uploaded ZFS 0.8 to experimental. But beware, the original
0.8.0 release has a regression bug which may cause data loss. I've
patched
that bug in the 0.8.0-2 upload but we are not sure whether there are
still
regression bugs hiding there. We plan to postpone the 0.8.0 exp->sid
migration even after the Buster release.

>> Sadly the Linux Kernel has introduced a commit in kernel 4.19 and 5.0
>> that prevents ZFS from using SIMD. The result is that ZFS won't be
>> usable in Buster. See the following issue
>> https://github.com/zfsonlinux/zfs/issues/8793
> 
> Buster ships zfs-dkms version 0.7.12-2 though, which works just fine on
> buster.

0.7.12-2 works with 4.19.37, but it will be badly broken when the first
point release of Buster is out. Foreseeable stable RC is grave enough:
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=929929

>> Would it be possible to provide an alternative patched linux kernel
>> that works with ZFS?

It seems that persuading the kernel team to patch the kernel
specifically for ZFS is impossible -- that's an dead end.
Another dead end is unblocking 0.7.13-1 .

Our last resort is to revert debdiff(0.7.12-2,0.7.12-5) and
apply the following patch (a part of the 0.7.12->0.7.13 diff):
https://github.com/zfsonlinux/zfs/commit/e22bfd814960295029ca41c8e116e8d516d3e730

This patch is not a solution but actually a compromise.

For personal Buster users there are two choices:
1. Pin kernel version (<< 4.19.38) and never upgrade. (assume
   the system admin knows what this means)
2. Patch the stable kernel locally.
3. Wait for 0.8.X/stable-backports which might contain a descent
solution.

Thread

ZFS in Buster Dan <ganchya@gmail.com> - 2019-05-28 18:50 +0200
  Re: ZFS in Buster Jonathan Carter <jcc@debian.org> - 2019-05-28 21:00 +0200
    Re: ZFS in Buster Ian Jackson <ijackson@chiark.greenend.org.uk> - 2019-05-28 22:30 +0200
      Re: ZFS in Buster Dan <ganchya@gmail.com> - 2019-05-28 23:30 +0200
      Re: ZFS in Buster Ansgar <ansgar@debian.org> - 2019-05-29 09:00 +0200
        Re: ZFS in Buster Ian Jackson <ijackson@chiark.greenend.org.uk> - 2019-05-29 15:00 +0200
          Re: ZFS in Buster Aron Xu <aron@debian.org> - 2019-05-29 15:50 +0200
            Re: ZFS in Buster Sam Hartman <leader@debian.org> - 2019-05-29 16:20 +0200
              Re: ZFS in Buster Mo Zhou <lumin@debian.org> - 2019-05-29 16:50 +0200
              Re: ZFS in Buster Sam Hartman <hartmans@debian.org> - 2019-05-29 17:00 +0200
    Re: ZFS in Buster Dan <ganchya@gmail.com> - 2019-05-29 13:50 +0200
      Re: ZFS in Buster Ben Hutchings <ben@decadent.org.uk> - 2019-05-29 16:00 +0200
        Re: ZFS in Buster Bastian Blank <waldi@debian.org> - 2019-06-06 16:30 +0200
          Re: ZFS in Buster Ondřej Surý <ondrej@sury.org> - 2019-06-06 17:20 +0200
            Re: ZFS in Buster Aron Xu <aron@debian.org> - 2019-06-06 20:10 +0200
              Re: ZFS in Buster Aron Xu <aron@debian.org> - 2019-06-08 11:00 +0200
                Re: ZFS in Buster Ondřej Surý <ondrej@sury.org> - 2019-06-08 11:40 +0200
                Re: ZFS in Buster Aron Xu <aron@debian.org> - 2019-06-08 12:20 +0200
                Re: ZFS in Buster Jeremy Stanley <fungi@yuggoth.org> - 2019-06-08 16:50 +0200
                Re: ZFS in Buster Sam Hartman <hartmans@debian.org> - 2019-06-08 19:10 +0200
                Re: ZFS in Buster Jeremy Stanley <fungi@yuggoth.org> - 2019-06-09 01:20 +0200
              Re: ZFS in Buster "Enrico Weigelt, metux IT consult" <lkml@metux.net> - 2019-07-01 21:10 +0200
                Re: ZFS in Buster "Enrico Weigelt, metux IT consult" <lkml@metux.net> - 2019-07-01 22:00 +0200
                Re: ZFS in Buster Sam Hartman <hartmans@debian.org> - 2019-07-01 22:20 +0200
            Re: ZFS in Buster Mo Zhou <lumin@debian.org> - 2019-06-10 10:30 +0200
    Re: ZFS in Buster Mo Zhou <lumin@debian.org> - 2019-06-03 16:50 +0200
      Re: ZFS in Buster Mo Zhou <lumin@debian.org> - 2019-06-03 18:10 +0200
        Re: ZFS in Buster Ian Jackson <ijackson@chiark.greenend.org.uk> - 2019-06-04 15:20 +0200
          Re: ZFS in Buster Sam Hartman <hartmans@debian.org> - 2019-06-04 17:00 +0200
            Re: ZFS in Buster Ian Jackson <ijackson@chiark.greenend.org.uk> - 2019-06-04 17:40 +0200
      Re: ZFS in Buster Dan <ganchya@gmail.com> - 2019-06-03 20:40 +0200
        Re: ZFS in Buster Sam Hartman <hartmans@debian.org> - 2019-06-03 20:50 +0200
  Re: ZFS in Buster "Enrico Weigelt, metux IT consult" <lkml@metux.net> - 2019-05-29 13:10 +0200
  Re: ZFS in Buster "Theodore Ts'o" <tytso@mit.edu> - 2019-06-02 04:20 +0200

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