Btrfs devel - Nov 2013 - The state of btrfs RAID6 as of kernel 3.13-rc1

Hi

What is the general state of btrfs RAID6 as of kernel 3.13-rc1 and the
latest btrfs tools?

More specifically:
- Is it able to correct errors during scrubs?
- Is it able to transparently handle disk failures without downtime?
- Is it possible to convert btrfs RAID10 to RAID6 without recreating the fs?
- Is it possible to add/remove drives to a RAID6 array?

Regards,

Hans-Kristian
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On Sun, Nov 24, 2013 at 02:47:56PM +0100, Hans-Kristian Bakke
wrote:
> Hi
> 
> What is the general state of btrfs RAID6 as of kernel 3.13-rc1 and the
> latest btrfs tools?
> 
> More specifically:
> - Is it able to correct errors during scrubs?
   Not yet, I believe.
> - Is it able to transparently handle disk failures without downtime?
   Not yet.
> - Is it possible to convert btrfs RAID10 to RAID6 without recreating the
fs?
   Yes.
> - Is it possible to add/remove drives to a RAID6 array?
   Yes.

   HTH,
   Hugo.
> Regards,
> 
> Hans-Kristian
-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ==  PGP
key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
      --- Normaliser unix c''est comme pasteuriser le Camembert ---

Thank you.

Are the missing RAID5/6 standard features beeing worked on at the
moment or could it just as well take several years until the basic
features are in place and working?
Mvh

Hans-Kristian Bakke


On 24 November 2013 14:50, Hugo Mills <hugo@carfax.org.uk>
wrote:
> On Sun, Nov 24, 2013 at 02:47:56PM +0100, Hans-Kristian Bakke wrote:
>> Hi
>>
>> What is the general state of btrfs RAID6 as of kernel 3.13-rc1 and the
>> latest btrfs tools?
>>
>> More specifically:
>> - Is it able to correct errors during scrubs?
>
>    Not yet, I believe.
>
>> - Is it able to transparently handle disk failures without downtime?
>
>    Not yet.
>
>> - Is it possible to convert btrfs RAID10 to RAID6 without recreating
the fs?
>
>    Yes.
>
>> - Is it possible to add/remove drives to a RAID6 array?
>
>    Yes.
>
>    HTH,
>    Hugo.
>
>> Regards,
>>
>> Hans-Kristian
>
> --
> === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk
==>   PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
>       --- Normaliser unix c''est comme pasteuriser le Camembert ---
--
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On Sun, Nov 24, 2013 at 03:13:44PM +0100, Hans-Kristian Bakke
wrote:
> Thank you.
> 
> Are the missing RAID5/6 standard features beeing worked on at the
> moment or could it just as well take several years until the basic
> features are in place and working?
   They''re being worked on by Chris. He''s been largely silent
about
timescales and progress, though.

   Hugo.
> Mvh
> 
> Hans-Kristian Bakke
> 
> 
> On 24 November 2013 14:50, Hugo Mills <hugo@carfax.org.uk> wrote:
> > On Sun, Nov 24, 2013 at 02:47:56PM +0100, Hans-Kristian Bakke wrote:
> >> Hi
> >>
> >> What is the general state of btrfs RAID6 as of kernel 3.13-rc1 and
the
> >> latest btrfs tools?
> >>
> >> More specifically:
> >> - Is it able to correct errors during scrubs?
> >
> >    Not yet, I believe.
> >
> >> - Is it able to transparently handle disk failures without
downtime?
> >
> >    Not yet.
> >
> >> - Is it possible to convert btrfs RAID10 to RAID6 without
recreating the fs?
> >
> >    Yes.
> >
> >> - Is it possible to add/remove drives to a RAID6 array?
> >
> >    Yes.
> >
> >    HTH,
> >    Hugo.
> >
> >> Regards,
> >>
> >> Hans-Kristian
> >
-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ==  PGP
key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
    --- We demand rigidly defined areas of doubt and uncertainty! ---