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BTRFS Raid1 余额与预期行为相反

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BTRFS Raid1 余额与预期行为相反

我在 raid1 中有 4 个驱动器。我最近用更大的新驱动器更换了故障驱动器。新的 12TB 驱动器似乎未得到充分利用。我进行了一项平衡，希望将数据从其他 3 个驱动器迁移到新驱动器。然而，数据似乎被错误地移动了。有人可以解释这种奇怪的行为吗？

# btrfs fi usage /av
Overall:
    Device size:              29.11TiB
    Device allocated:         11.32TiB
    Device unallocated:       17.79TiB
    Device missing:              0.00B
    Used:                     10.90TiB
    Free (estimated):          9.10TiB  (min: 9.10TiB)
    Data ratio:                   2.00
    Metadata ratio:               2.00
    Global reserve:          512.00MiB  (used: 0.00B)

Data,RAID1: Size:5.65TiB, Used:5.44TiB (96.32%)
   /dev/sdh    5.13TiB
   /dev/sdf    3.33TiB
   /dev/sdg    2.54TiB
   /dev/sde  310.00GiB

Metadata,RAID1: Size:9.00GiB, Used:7.28GiB (80.91%)
   /dev/sdh    6.00GiB
   /dev/sdf    3.00GiB
   /dev/sdg    6.00GiB
   /dev/sde    3.00GiB

System,RAID1: Size:32.00MiB, Used:976.00KiB (2.98%)
   /dev/sdg   32.00MiB
   /dev/sde   32.00MiB

Unallocated:
   /dev/sdh    2.14TiB
   /dev/sdf    2.13TiB
   /dev/sdg    2.91TiB
   /dev/sde   10.61TiB

在未过滤的平衡期间，我开始监控进度，如下所示：

# btrfs fi show /av
Label: 'av'  uuid: a0e1cb85-1b4f-4657-971d-ba1d8c1bb772
    Total devices 4 FS bytes used 5.45TiB
    devid    4 size 7.28TiB used 5.13TiB path /dev/sdh
    devid    5 size 5.46TiB used 3.33TiB path /dev/sdf
    devid    6 size 5.46TiB used 2.57TiB path /dev/sdg
    devid    7 size 10.91TiB used 330.06GiB path /dev/sde

# btrfs fi show 
Label: 'av'  uuid: a0e1cb85-1b4f-4657-971d-ba1d8c1bb772
    Total devices 4 FS bytes used 5.45TiB
    devid    4 size 7.28TiB used 5.13TiB path /dev/sdh
    devid    5 size 5.46TiB used 3.33TiB path /dev/sdf
    devid    6 size 5.46TiB used 2.56TiB path /dev/sdg
    devid    7 size 10.91TiB used 320.03GiB path /dev/sde

# btrfs fi show
Label: 'av'  uuid: a0e1cb85-1b4f-4657-971d-ba1d8c1bb772
    Total devices 4 FS bytes used 5.45TiB
    devid    4 size 7.28TiB used 5.13TiB path /dev/sdh
    devid    5 size 5.46TiB used 3.33TiB path /dev/sdf
    devid    6 size 5.46TiB used 2.55TiB path /dev/sdg
    devid    7 size 10.91TiB used 313.03GiB path /dev/sde

12TB 驱动器 7 没有添加新数据，而是被删除。那是怎么回事？而且，如何使数据更均匀地分布在所有驱动器上？

附加信息

btrfs --version
btrfs-progs v5.4.1

我不记得我使用哪个版本的 btrfs 来创建卷或添加设备。

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