I know df does not report the correct size for btrfs raid systems. Is
there any other way to find out the total capacity of a btrfs file
system? Or at least the raid level for data / metadata?
My test system is Ubuntu 10.10 alpha with btrfs 0.19 and a 2.6.35 kernel
(don't know which rc).
# uname -a
Linux ubuntu 2.6.35-12-generic #17-Ubuntu SMP Mon Jul 26 18:48:06 UTC
2010 x86_64 GNU/Linux
I created a raid1 system consisting of two 8GB devices (so total
capacity would be 8 GB for system + metadata + data)
# mkfs.btrfs -d raid1 -m raid1 /dev/sdb1 /dev/sdc1
# mount /dev/sdb1 /media/btrfs
Now I gather all information I can with btrfs:
# btrfs filesystem show /dev/sdb1
Label: none uuid: dc691a5d-187e-4cb4-a94a-d12dabdffde4
Total devices 2 FS bytes used 28.00KB
devid 1 size 8.00GB used 2.03GB path /dev/sdb1
devid 2 size 8.00GB used 2.01GB path /dev/sdc1
# btrfs filesystem df /media/btrfs/
Data: total=1.01GB, used=0.00
Metadata: total=1.01GB, used=24.00KB
System: total=12.00MB, used=4.00KB
Is there a way to find out how devid 1 and devid 2 are used (i.e. which
raid level)?
Is there a btrfs command to get the total capacity of my filesystem? (In
my case, it should report total 8 GB, of which 2.03 GB have already been
claimed for data + metadata, another 5.97 GB are free. It might also say
6,97 GB for data are still available.)
Thank you,
Michael Kofler
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