Re: Balance: invalid convert data profile raid10

[Qu Wenruo <quwenruo.btrfs@gmx.com>]

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On 2018/11/28 上午5:16, Mikko Merikivi wrote:
> I seem unable to convert an existing btrfs device array to RAID 10.
> Since it's pretty much RAID 0 and 1 combined, and 5 and 6 are
> unstable, it's what I would like to use.
> 
> After I did tried this with 4.19.2-arch1-1-ARCH and btrfs-progs v4.19,
> I updated my system and tried btrfs balance again with this system
> information:
> [mikko@localhost lvdata]$ uname -a
> Linux localhost 4.19.4-arch1-1-ARCH #1 SMP PREEMPT Fri Nov 23 09:06:58
> UTC 2018 x86_64 GNU/Linux
> [mikko@localhost lvdata]$ btrfs --version
> btrfs-progs v4.19
> [mikko@localhost lvdata]$ sudo btrfs fi show
> Label: 'main1'  uuid: c7cbb9c3-8c55-45f1-b03c-48992efe2f11
>         Total devices 1 FS bytes used 2.90TiB
>         devid    1 size 3.64TiB used 2.91TiB path /dev/mapper/main
> 
> Label: 'red'  uuid: f3c781a8-0f3e-4019-acbf-0b783cf566d0
>         Total devices 2 FS bytes used 640.00KiB
>         devid    1 size 931.51GiB used 2.03GiB path /dev/mapper/red1
>         devid    2 size 931.51GiB used 2.03GiB path /dev/mapper/red2

RAID10 needs at least 4 devices.

Thanks,
Qu

> [mikko@localhost lvdata]$ btrfs fi df /mnt/red/
> Data, RAID1: total=1.00GiB, used=512.00KiB
> System, RAID1: total=32.00MiB, used=16.00KiB
> Metadata, RAID1: total=1.00GiB, used=112.00KiB
> GlobalReserve, single: total=16.00MiB, used=0.00B
> 
> ---
> 
> Here are the steps I originally used:
> 
> [mikko@localhost lvdata]$ sudo cryptsetup luksFormat -s 512
> --use-random /dev/sdc
> [mikko@localhost lvdata]$ sudo cryptsetup luksFormat -s 512
> --use-random /dev/sdd
> [mikko@localhost lvdata]$ sudo cryptsetup luksOpen /dev/sdc red1
> [mikko@localhost lvdata]$ sudo cryptsetup luksOpen /dev/sdd red2
> [mikko@localhost lvdata]$ sudo mkfs.btrfs -L red /dev/mapper/red1
> btrfs-progs v4.19
> See http://btrfs.wiki.kernel.org for more information.
> 
> Label:              red
> UUID:               f3c781a8-0f3e-4019-acbf-0b783cf566d0
> Node size:          16384
> Sector size:        4096
> Filesystem size:    931.51GiB
> Block group profiles:
>   Data:             single            8.00MiB
>   Metadata:         DUP               1.00GiB
>   System:           DUP               8.00MiB
> SSD detected:       no
> Incompat features:  extref, skinny-metadata
> Number of devices:  1
> Devices:
>    ID        SIZE  PATH
>     1   931.51GiB  /dev/mapper/red1
> 
> [mikko@localhost lvdata]$ sudo mount -t btrfs -o
> defaults,noatime,nodiratime,autodefrag,compress=lzo /dev/mapper/red1
> /mnt/red
> [mikko@localhost lvdata]$ sudo btrfs device add /dev/mapper/red2 /mnt/red
> [mikko@localhost lvdata]$ sudo btrfs balance start -dconvert=raid10
> -mconvert=raid10 /mnt/red
> ERROR: error during balancing '/mnt/red': Invalid argument
> There may be more info in syslog - try dmesg | tail
> code 1
> 
> [mikko@localhost lvdata]$ dmesg | tail
> [12026.263243] BTRFS info (device dm-1): disk space caching is enabled
> [12026.263244] BTRFS info (device dm-1): has skinny extents
> [12026.263245] BTRFS info (device dm-1): flagging fs with big metadata feature
> [12026.275153] BTRFS info (device dm-1): checking UUID tree
> [12195.431766] BTRFS info (device dm-1): enabling auto defrag
> [12195.431769] BTRFS info (device dm-1): use lzo compression, level 0
> [12195.431770] BTRFS info (device dm-1): disk space caching is enabled
> [12195.431771] BTRFS info (device dm-1): has skinny extents
> [12205.815941] BTRFS info (device dm-1): disk added /dev/mapper/red2
> [12744.788747] BTRFS error (device dm-1): balance: invalid convert
> data profile raid10
> 
> Converting to RAID 1 did work but what can I do to make it RAID 10?
> With the up-to-date system it still says "invalid convert data profile
> raid10".
> 


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