I tried to convert my btrfs from raid1 to raid5 but after the balance command
it's still raid1.
Also for raid56 the wiki says "Parity may be inconsistent after a crash (the
"write hole")"
does that mean if I convert metadata to raid5/6 and the parity becomes
inconsistent my btrfs will be lost?
Kernel is v4.0 on debian/sid
The filesystem was created with nodesize 8k if I remember correctly
Mount options for /srv/ noatime,nodev,space_cache,subvol=@
No snapshots and only a few subvolumes
Free space is ~450GiB
To convert the data profile to raid5 (with btrfs-progs v3.17) I did
btrfs balance start -v -dconvert=raid5 /srv/
but after the the command was done (after 10 days)
btrfs fi sho /srv/
still shows data as raid1, free space is also what would be expected for raid1
no errors, no problems, no raid5
So I compiled the newer btrfs-progs v3.19.1 and did (I also tried raid6, same
result still raid1)
btrfs balance start -v -dconvert=raid5 -dlimit=1 /srv/
Dumping filters: flags 0x1, state 0x0, force is off
DATA (flags 0x120): converting, target=128, soft is off, limit=1
Done, had to relocate 1 out of 12071 chunks
dmesg shows only this, no errors
[170427.207107] BTRFS info (device sdj): relocating block group 65294058848256
flags 17
[170461.591056] BTRFS info (device sdj): found 129 extents
[170476.270765] BTRFS info (device sdj): found 129 extents
btrfs fi sho /srv/
shows all data as raid1
btrfs fi sho
Label: none uuid: xxxxxxxx-xxxx-xxxx-xxxxxxxxxxxxxxxxx
Total devices 9 FS bytes used 11.78TiB
devid 1 size 2.73TiB used 2.62TiB path /dev/sdh
devid 2 size 2.73TiB used 2.62TiB path /dev/sdj
devid 3 size 2.73TiB used 2.62TiB path /dev/sdg
devid 4 size 2.73TiB used 2.62TiB path /dev/sdi
devid 5 size 2.73TiB used 2.62TiB path /dev/sdf
devid 6 size 2.73TiB used 2.62TiB path /dev/sde
devid 7 size 2.73TiB used 2.62TiB path /dev/sdc
devid 9 size 2.73TiB used 2.62TiB path /dev/sdd
devid 10 size 2.73TiB used 2.62TiB path /dev/sda
btrfs-progs v3.19.1
btrfs fi df /srv/
Data, RAID1: total=11.76TiB, used=11.76TiB
System, RAID1: total=32.00MiB, used=1.62MiB
Metadata, RAID1: total=17.06GiB, used=14.85GiB
GlobalReserve, single: total=512.00MiB, used=0.00B
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