I have been using btrfs for my /home partition on my home machine for
a few years now. I created the file system RAID1 using two disk
partitions. Recently I noticed btrfs fi df shows extra Data, System,
and Metadata allocations. And btrfs fi show indicates extra
allocations on one of my disk drives accounting for the 20 MiB
allocation in the df display.
I'm confused. What does this mean?
garry@vfr$ sudo btrfs subvolume list /home
garry@vfr$ sudo btrfs filesystem df /home
Data, RAID1: total=32.00GiB, used=21.01GiB
--> Data, single: total=8.00MiB, used=0.00
System, RAID1: total=8.00MiB, used=12.00KiB
--> System, single: total=4.00MiB, used=0.00
Metadata, RAID1: total=15.00GiB, used=424.60MiB
--> Metadata, single: total=8.00MiB, used=0.00
garry@vfr$ sudo btrfs filesystem show /home
Label: none uuid: 6c3aeff6-9a50-4481-a175-7b98980eb638
Total devices 2 FS bytes used 21.43GiB
--> devid 1 size 373.76GiB used 47.03GiB path /dev/sda4
devid 2 size 373.76GiB used 47.01GiB path /dev/sdb4
Btrfs v3.12
garry@vfr$
If it matters, I create a snapshot each night and run a rsync backup
to another drive and then delete the snapshot.
garry@vfr$ uname -r
3.11.10-200.fc19.x86_64
garry@vfr$ rpm -q btrfs-progs
btrfs-progs-3.12-1.fc19.x86_64
--
Garry T. Williams
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