james harvey wrote on 2015/10/19 23:49 -0400:
The create RAID1 example illustrates my question, at:
https://btrfs.wiki.kernel.org/index.php/UseCases#How_do_I_create_a_RAID1_mirror_in_Btrfs.3F
It shows:
mkfs.btrfs -m raid1 -d raid1 /dev/sda1 /dev/sdb1
will result in:
btrfs fi df /mount
Data, RAID1: total=1.00GB, used=128.00KB
Data: total=8.00MB, used=0.00
System, RAID1: total=8.00MB, used=4.00KB
System: total=4.00MB, used=0.00
Metadata, RAID1: total=1.00GB, used=24.00KB
Metadata: total=8.00MB, used=0.00
What's the 8MB, System 4MB, and Metadata 8MB areas that appear not to
be redundant?
That's the temporary data/metadata/system chunk made at mkfs time.
And since you have RAID1, such temporary chunk will never be used.
You can remove such chunk by a balance.
The behavior should be changed in v4.3 and new mkfs in v4.3 should
remove temporary chunks automatically.
Thanks,
Qu
I'm seeing these small areas on my own RAID1, but using the example
for simplicity.
I'm sure it has to be OK those spaces aren't redundant, but I don't
get what could be there that wouldn't be critical...
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