>[оверквотинг удален]
> (default since btrfs-progs 3.18, kernel support since 3.10)
> reduced-size metadata for extent references, saves a few
> percent of metadata
>> Я уж молчу про профайлы данных/метаданных, которые по умолчанию дублирутся, у меня
>> было:
>>> Metadata,DUP: 326.38MiB
>>> System, DUP: total=8.00MiB, used=16.00KiB
>>> Metadata, DUP: total=163.19MiB, used=58.08MiB
> Метаданные дублируются, если установлен флаг ротации для накопителя (/sys/block/DEV/queue/rotational).
> https://btrfs.wiki.kernel.org/index.php/Manpage/mkfs.btrfs#O... Чейта?
cat /sys/block/loop0/queue/rotational
0
mkfs.btrfs -O no-holes,raid1c34 /data/raid1/img.img -f
btrfs-progs v5.9
See http://btrfs.wiki.kernel.org for more information.
Label: (null)
UUID: c6bb90bf-4eb6-4fd8-954e-cb5121e0255f
Node size: 16384
Sector size: 4096
Filesystem size: 1.00GiB
Block group profiles:
Data: single 8.00MiB
Metadata: DUP 51.19MiB
System: DUP 8.00MiB
SSD detected: no
Incompat features: extref, skinny-metadata, no-holes, raid1c34
Runtime features:
Checksum: crc32c
Number of devices: 1
Devices:
ID SIZE PATH
1 1.00GiB /data/raid1/img.img
mkfs.btrfs -O mixed-bg -n 4096 /data/raid1/img.img -f
btrfs-progs v5.9
See http://btrfs.wiki.kernel.org for more information.
Label: (null)
UUID: 2eb247d9-4698-43f5-8283-6763b7f4a5b7
Node size: 4096
Sector size: 4096
Filesystem size: 1.00GiB
Block group profiles:
Data: single 8.00MiB
Metadata: DUP 51.19MiB
System: DUP 8.00MiB
SSD detected: no
Incompat features: mixed-bg, extref, skinny-metadata
Runtime features:
Checksum: crc32c
Number of devices: 1
Devices:
ID SIZE PATH
1 1.00GiB /data/raid1/img.img
mkfs.btrfs /data/raid1/img.img -f
btrfs-progs v5.9
See http://btrfs.wiki.kernel.org for more information.
Label: (null)
UUID: 832f8239-9a06-4cdb-aa71-fd9fa0bb25a6
Node size: 16384
Sector size: 4096
Filesystem size: 1.00GiB
Block group profiles:
Data: single 8.00MiB
Metadata: DUP 51.19MiB
System: DUP 8.00MiB
SSD detected: no
Incompat features: extref, skinny-metadata
Runtime features:
Checksum: crc32c
Number of devices: 1
Devices:
ID SIZE PATH
1 1.00GiB /data/raid1/img.img