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From: Andreas Grosse <andig.listen@aol.com>
To: linux-btrfs@vger.kernel.org
Subject: Incompat features: raid56 ... when creating a RAID6?
Date: Tue, 15 Mar 2016 22:42:29 +0100	[thread overview]
Message-ID: <16570443.SxVegaKaET@andilaptop> (raw)

Hello everyone!

I just wanted to create a RAID6 and got the following output:

> # mkfs.btrfs -d raid6 -m raid6 -L slowPool /dev/sd[cdefgh]
> btrfs-progs v4.4.1
> See http://btrfs.wiki.kernel.org for more information.
> 
> Label:              slowPool
> UUID:               85ddf6a7-51f1-4cc0-b6cd-d472277b0e86
> Node size:          16384
> Sector size:        4096
> Filesystem size:    27.29TiB
> 
> Block group profiles:
>   Data:             RAID6             4.01GiB
>   Metadata:         RAID6             4.01GiB
>   System:           RAID6            14.50MiB
> 
> SSD detected:       no
> Incompat features:  extref, raid56, skinny-metadata
> Number of devices:  6
> 
> Devices:
>    ID        SIZE  PATH
>    
>     1     4.55TiB  /dev/sdc
>     2     4.55TiB  /dev/sdd
>     3     4.55TiB  /dev/sde
>     4     4.55TiB  /dev/sdf
>     5     4.55TiB  /dev/sdg
>     6     4.55TiB  /dev/sdh\0

And then the line saying "Incompat features: ... raid56" came to my eyes. 
Reading the corresponding manpage, it says:
> raid56
>     extended format for RAID5/6, also enabled if raid5 or raid6 block groups
>     are selected\0

So why is raid56 marked as incompatible if I just created a file system with 
multiple disks using the RAID6 profile? Have I misunderstood something there? 
I am confused. Can somebody here lighten this up?

(If important: Gentoo Linux with kernel 4.5.0, btrfs-progs v4.4.1)

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             reply	other threads:[~2016-03-15 21:59 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-15 21:42 Andreas Grosse [this message]
2016-03-15 22:06 ` Incompat features: raid56 ... when creating a RAID6? Hugo Mills
2016-03-15 22:19 ` Anand Jain
2016-03-15 23:51   ` Andreas Grosse
2016-03-16  0:52     ` Anand Jain
2016-03-16  9:12       ` Andreas Grosse
2016-03-17  7:55         ` Duncan

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