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List:       linux-btrfs
Subject:    balance conversion from RAID-1 to RAID-10 leaves some metadata in RAID-1?
From:       Tomasz Chmielewski <mangoo () wpkg ! org>
Date:       2020-03-01 10:30:34
Message-ID: 56ef4bcdd854a9dde3cbe2f5760592ed () wpkg ! org
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Just finished a conversion from RAID-1 to RAID-10, on Linux 5.5.6:

# time btrfs balance start -dconvert=raid10 -mconvert=raid10 /data/lxd
Done, had to relocate 2064 out of 2064 chunks

real    1811m51.427s
user    0m0.000s
sys     1259m34.448s


# echo $?
0

# dmesg
(...)
[211862.205521] BTRFS info (device sda2): found 40805 extents
[211910.773888] BTRFS info (device sda2): found 40805 extents
[211965.321150] BTRFS info (device sda2): relocating block group 
3492979671040 flags data|raid1
[211972.743476] BTRFS info (device sda2): found 37221 extents
[212020.193342] BTRFS info (device sda2): found 37221 extents
[212084.580739] BTRFS info (device sda2): balance: ended with status: 0


To my surprise, some metadata is still RAID-1 - is it expected?

# btrfs fi usage /data/lxd
Overall:
     Device size:                   6.91TiB
     Device allocated:              6.70TiB
     Device unallocated:          210.40GiB
     Device missing:                  0.00B
     Used:                          3.96TiB
     Free (estimated):              1.46TiB      (min: 1.46TiB)
     Data ratio:                       2.00
     Metadata ratio:                   2.00
     Global reserve:              512.00MiB      (used: 0.00B)

Data,RAID10: Size:3.32TiB, Used:1.97TiB (59.20%)
    /dev/sda2       1.66TiB
    /dev/sdd2       1.66TiB
    /dev/sdc2       1.66TiB
    /dev/sdb2       1.66TiB

Metadata,RAID1: Size:2.00GiB, Used:85.02MiB (4.15%)
    /dev/sdc2       2.00GiB
    /dev/sdb2       2.00GiB

Metadata,RAID10: Size:29.00GiB, Used:12.55GiB (43.27%)
    /dev/sda2      14.50GiB
    /dev/sdd2      14.50GiB
    /dev/sdc2      14.50GiB
    /dev/sdb2      14.50GiB

System,RAID10: Size:64.00MiB, Used:400.00KiB (0.61%)
    /dev/sda2      32.00MiB
    /dev/sdd2      32.00MiB
    /dev/sdc2      32.00MiB
    /dev/sdb2      32.00MiB

Unallocated:
    /dev/sda2      53.60GiB
    /dev/sdd2      53.60GiB
    /dev/sdc2      51.60GiB
    /dev/sdb2      51.60GiB


# btrfs fi df /data/lxd
Data, RAID10: total=3.32TiB, used=1.97TiB
System, RAID10: total=64.00MiB, used=400.00KiB
Metadata, RAID10: total=29.00GiB, used=12.55GiB
Metadata, RAID1: total=2.00GiB, used=85.02MiB
GlobalReserve, single: total=512.00MiB, used=0.00B


# btrfs fi show /data/lxd
Label: 'lxd5'  uuid: 2b77b498-a644-430b-9dd9-2ad3d381448a
         Total devices 4 FS bytes used 1.98TiB
         devid    1 size 1.73TiB used 1.67TiB path /dev/sda2
         devid    3 size 1.73TiB used 1.67TiB path /dev/sdd2
         devid    4 size 1.73TiB used 1.68TiB path /dev/sdc2
         devid    5 size 1.73TiB used 1.68TiB path /dev/sdb2




Tomasz Chmielewski
https://lxadm.com
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