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Setting up a Raid1 Btrfs Home partition

Sat 19th April, 2014
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2 min read, 298 words.

Category: tech

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$ sudo su -

$ mkfs.btrfs -f /dev/sdb
$ mkfs.btrfs -f /dev/sdc

$ btrfs fi show

Should give you output something like this:

Cannot analyze code. No Pygments lexer found for “txt”.

.. code-block:: txt

        Label: none  uuid: bfee4bb4-3886-406f-94df-cb2dcf42f044
                Total devices 1 FS bytes used 112.00KiB
                devid    1 size 5.00GiB used 548.00MiB path /dev/sdc

        Label: none  uuid: a0192bd3-a8f7-477b-9bae-fea9a48aa1ab
                Total devices 1 FS bytes used 2.24GiB
                devid    1 size 5.00GiB used 3.04GiB path /dev/sdb

        Btrfs v3.12

$ mkdir /mnt/butter

$ mount /dev/sdb /mnt/butter $ btrfs device add -f /dev/sdc /mnt/butter

$ btrfs fi show

Label: none  uuid: a0192bd3-a8f7-477b-9bae-fea9a48aa1ab
        Total devices 2 FS bytes used 2.24GiB
        devid    1 size 5.00GiB used 3.04GiB path /dev/sdb
        devid    2 size 5.00GiB used 0.00 path /dev/sdc

Btrfs v3.12

$ btrfs fi df /mnt/butter

Data, single: total=2.51GiB, used=2.23GiB
System, DUP: total=8.00MiB, used=16.00KiB
System, single: total=4.00MiB, used=0.00
Metadata, DUP: total=256.00MiB, used=2.94MiB
Metadata, single: total=8.00MiB, used=0.00


$ btrfs balance start -v -dconvert=raid1 -mconvert=raid1 /mnt/butter

$ btrfs fi df /mnt/butter

Data, RAID1: total=3.96GiB, used=2.23GiB
System, RAID1: total=32.00MiB, used=16.00KiB
System, single: total=4.00MiB, used=0.00
Metadata, RAID1: total=256.00MiB, used=2.55MiB


$ btrfs fi show
Label: none  uuid: a0192bd3-a8f7-477b-9bae-fea9a48aa1ab
        Total devices 2 FS bytes used 2.24GiB
        devid    1 size 5.00GiB used 4.25GiB path /dev/sdb
        devid    2 size 5.00GiB used 4.25GiB path /dev/sdc



$ btrfs balance start -v -dconvert=raid1 -mconvert=raid1 /mnt/btrfs/

Dumping filters: flags 0x7, state 0x0, force is off
  DATA (flags 0x100): converting, target=16, soft is off
  METADATA (flags 0x100): converting, target=16, soft is off
  SYSTEM (flags 0x100): converting, target=16, soft is off
... 10 hours later ...
Done, had to relocate 1269 out of 1269 chunks


$ btrfs fi show
Label: home1  uuid: 43f4a92c-9475-400b-a6e4-88639f55dd71
        Total devices 2 FS bytes used 1.23TiB
        devid    1 size 1.82TiB used 1.24TiB path /dev/sdb1
        devid    2 size 1.82TiB used 1.24TiB path /dev/sdc1


$ btrfs fi df /mnt/btrfs/

Data, RAID1: total=1.23TiB, used=1.23TiB
System, RAID1: total=32.00MiB, used=184.00KiB
Metadata, RAID1: total=6.00GiB, used=2.71GiB



watch -cn 300 btrfs balance status /mnt/btrfs/

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