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Re: Experiences with BTRFS -- is it mature enough for enterprise use?

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On 12/31/17 09:44, Sven Hartge wrote:
> David Christensen <dpchrist@holgerdanske.com> wrote:
>> On 12/30/17 14:38, Matthew Crews wrote:
> 
>>> The main issue I see with using BTRFS with MDADM is that you lose the
>>> benefit of bit-rot repair. MDADM can't correct bit rot, but
>>> BTRFS-Raid (and ZFS raid arrays) can, but only with native raid
>>> configurations.
> 
>> AFAIK:
> 
>> 1.  mdadm RAID1 can fix bit rot, so long as one drive has a good block
>> to fix the others.
> 
> Yes, but it can't fix silent bit-rot, where incorrect bytes are read
> from the drive without the drive noticing. In that case the Kernel has
> no way of knowing which bytes are the correct ones, you need some sort
> of checksum for that.

My bad -- the only way for md to detect bit-rot is via scrubbing:

     $ man 4 md

     SCRUBBING AND MISMATCHES
     ...
        If check was used, then no action is taken to handle the 
mismatch,  it
        is  simply  recorded.   If  repair  was  used,  then a mismatch 
will be
        repaired in the same way that resync repairs arrays.   For 
RAID5/RAID6
        new parity blocks are written.  For RAID1/RAID10, all but one 
block are
        overwritten with the content of that one block.


I wonder how md picks "that one block"?


I tried to STFW for an md design document -- e.g. explains what file 
structures, data structures, algorithms, etc., are used by md and why -- 
nope.


David

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Experiences with BTRFS -- is it mature enough for enterprise use? Rick Thomas <rbthomas@pobox.com> - 2017-12-26 20:50 +0100
  Re: Experiences with BTRFS -- is it mature enough for enterprise use? Eero Volotinen <eero.volotinen@iki.fi> - 2017-12-26 20:50 +0100
    Re: Experiences with BTRFS -- is it mature enough for enterprise use? Roberto C. Sánchez <roberto@debian.org> - 2017-12-26 23:30 +0100
      Re: Experiences with BTRFS -- is it mature enough for enterprise use? Sven Hartge <sven@svenhartge.de> - 2017-12-27 00:00 +0100
      Re: Experiences with BTRFS -- is it mature enough for enterprise use? Michael Stone <mstone@debian.org> - 2017-12-27 00:40 +0100
  Re: Experiences with BTRFS -- is it mature enough for enterprise use? Jan Vales <jan@jvales.net> - 2017-12-26 21:30 +0100
  Re: Experiences with BTRFS -- is it mature enough for enterprise use? Andy Smith <andy@strugglers.net> - 2017-12-26 22:40 +0100
  Re: Experiences with BTRFS -- is it mature enough for enterprise use? David Christensen <dpchrist@holgerdanske.com> - 2017-12-27 04:10 +0100
    Re: Experiences with BTRFS -- is it mature enough for enterprise use? Matthew Crews <mailinglists@mattcrews.com> - 2017-12-27 13:00 +0100
      Re: Experiences with BTRFS -- is it mature enough for enterprise use? Tom Dial <tddial@comcast.net> - 2017-12-27 23:10 +0100
        Re: Experiences with BTRFS -- is it mature enough for enterprise use? Rick Thomas <rick.thomas@pobox.com> - 2017-12-28 02:10 +0100
          Re: Experiences with BTRFS -- is it mature enough for enterprise use? deloptes <deloptes@gmail.com> - 2017-12-28 02:20 +0100
            Re: Experiences with BTRFS -- is it mature enough for enterprise use? Eero Volotinen <eero.volotinen@iki.fi> - 2017-12-28 07:10 +0100
              Re: Experiences with BTRFS -- is it mature enough for enterprise use? Dan Ritter <dsr@randomstring.org> - 2017-12-28 17:00 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? Eero Volotinen <eero.volotinen@iki.fi> - 2017-12-28 18:30 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? Glenn English <ghe2001@gmail.com> - 2017-12-28 20:40 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? Matthew Crews <mailinglists@mattcrews.com> - 2017-12-28 20:50 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? Andy Smith <andy@strugglers.net> - 2017-12-29 01:00 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? Jan Vales <jan@jvales.net> - 2017-12-30 00:50 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? Matthew Crews <mailinglists@mattcrews.com> - 2017-12-30 01:30 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? Jan Vales <jan@jvales.net> - 2017-12-30 01:40 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? Matthew Crews <mailinglists@mattcrews.com> - 2017-12-30 23:40 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? David Christensen <dpchrist@holgerdanske.com> - 2017-12-31 07:20 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? Sven Hartge <sven@svenhartge.de> - 2017-12-31 18:50 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? David Christensen <dpchrist@holgerdanske.com> - 2017-12-31 23:10 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? Sven Hartge <sven@svenhartge.de> - 2017-12-31 23:50 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? David Christensen <dpchrist@holgerdanske.com> - 2018-01-02 03:10 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? <tomas@tuxteam.de> - 2018-01-02 11:30 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? David Christensen <dpchrist@holgerdanske.com> - 2018-01-02 17:40 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? deloptes <deloptes@gmail.com> - 2018-01-02 19:10 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-01-02 20:10 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? deloptes <deloptes@gmail.com> - 2018-01-03 01:00 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-01-04 00:00 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? deloptes <deloptes@gmail.com> - 2018-01-04 09:00 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-01-04 20:20 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? deloptes <deloptes@gmail.com> - 2018-01-04 22:00 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? deloptes <deloptes@gmail.com> - 2018-01-04 12:00 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? David Christensen <dpchrist@holgerdanske.com> - 2018-01-03 00:10 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? Darac Marjal <mailinglist@darac.org.uk> - 2018-01-03 00:50 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? Gene Heskett <gheskett@shentel.net> - 2018-01-03 02:10 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? Richard Hector <richard@walnut.gen.nz> - 2018-01-06 13:30 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? David Christensen <dpchrist@holgerdanske.com> - 2018-01-03 08:40 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? Joel Wirāmu Pauling <joel@aenertia.net> - 2017-12-31 23:20 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? Andy Smith <andy@strugglers.net> - 2018-01-03 04:40 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? Pascal Hambourg <pascal@plouf.fr.eu.org> - 2017-12-30 10:30 +0100
                Re: Experiences with BTRFS -- is it mature enough for enterprise use? Dan Ritter <dsr@randomstring.org> - 2017-12-28 21:10 +0100
              Re: Experiences with BTRFS -- is it mature enough for enterprise use? deloptes <deloptes@gmail.com> - 2017-12-28 18:00 +0100
  Re: Experiences with BTRFS -- is it mature enough for enterprise use? Igor Cicimov <icicimov@gmail.com> - 2017-12-29 05:00 +0100

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