On 2016-11-29 09:32, Timofey Titovets wrote:
Hi, as wiki say https://btrfs.wiki.kernel.org/index.php/Glossary:
A part of a block group. Chunks are either 1 GiB in size (for data) or
256 MiB (for metadata).
This is only about the normal case. Chunks are variable in size. In
most cases, data chunks will be 1GB and metadata 256MB. They will
however be smaller if there isn't enough space left for a full chunk,
and will get larger as well once you get past a certain filesystem size
(I don't remember the exact size, but I've seen people talking about big
(double digit TB sized) filesystems with 5GB+ sized data chunks).
Btrfs tools show me that allocated size is not 1GiB aligned, things
are changes? I miss something?
# btrfs fi df /; btrfs fi usage /;
Data, single: total=1.41GiB, used=704.47MiB
System, single: total=32.00MiB, used=16.00KiB
Metadata, single: total=256.00MiB, used=54.30MiB
GlobalReserve, single: total=32.00MiB, used=0.00B
Overall:
Device size: 4.00GiB
Device allocated: 1.69GiB
Device unallocated: 2.31GiB
Device missing: 0.00B
Used: 758.79MiB
Free (estimated): 3.03GiB (min: 3.03GiB)
Data ratio: 1.00
Metadata ratio: 1.00
Global reserve: 32.00MiB (used: 0.00B)
Data,single: Size:1.41GiB, Used:704.47MiB
/dev/sda1 1.41GiB
Metadata,single: Size:256.00MiB, Used:54.30MiB
/dev/sda1 256.00MiB
System,single: Size:32.00MiB, Used:16.00KiB
/dev/sda1 32.00MiB
Unallocated:
/dev/sda1 2.31GiB
Thanks.
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