Hi btrfs folks,
I'm afraid I have a newbie question... but I can't sort it out? It's
just about adding a disk to a btrfs volume and not getting the correct
amount of GB in the end...
I have a btrfs volume which already consists of two different devices
and which is mounted on /samples. Its total size is 194G.
$ df -h
Filesystem Size Used Avail Use% Mounted on ... /dev/sdc1 194G 165G 20G
90% /samples
Now, I would like to add another 500G to that volume, from another device. I did
$ sudo mkfs.btrfs -m raid0 -d raid0 /dev/sdb
$ sudo btrfs device add /dev/sdb /samples
My filesystem now correctly reports:
$ sudo btrfs filesystem show
Label: none uuid: 545e95c6-d347-4a8c-8a49-38b9f9cb9add
Total devices 3 FS bytes used 161.98GB
devid 3 size 465.76GB used 0.00 path /dev/sdb
devid 2 size 93.13GB used 84.51GB path /dev/sdc1
devid 1 size 100.61GB used 84.53GB path /dev/sdc6
But I miss some space when I do:
$ df -h
Filesystem Size Used Avail Use% Mounted on
...
/dev/sdc1 660G 165G 43G 80% /samples
I added 500G! Why haven't I got more available??
To debug, I ran this command:
$ sudo btrfs filesystem df /samples
Data, RAID0: total=162.00GB, used=159.79GB
Data: total=8.00MB, used=7.48MB
System, RAID1: total=8.00MB, used=24.00KB
System: total=4.00MB, used=0.00
Metadata, RAID1: total=3.50GB, used=2.19GB
Metadata: total=8.00MB, used=0.00
My data is in RAID0, that's ok. So where have my 500G gone, and how
can I fix this?
Thanks
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