Hi list,
I have a 4-device RAID10 array of 2TB drives on btrfs. It works great. I
recently added an additional 4 drives to the array. There is only about
2TB in use across the whole array (which should have an effective
capacity of about 8TB). However I have noticed that when I issue btrfs
filesystem df against the mountpoint, in the "total" field, I get the
same value as the "used" field:
root@mckinley:/# btrfs fi df /mnt/shares/btrfsvol0
Data, RAID10: total=2.06TB, used=2.06TB
System, RAID10: total=64.00MB, used=188.00KB
System: total=4.00MB, used=0.00
Metadata, RAID10: total=3.00GB, used=2.29GB
Here's my btrfs filesystem show:
root@mckinley:/# btrfs fi show
Label: 'btrfsvol0' uuid: 1a735971-3ad7-4046-b25b-e834a74f2fbb
Total devices 8 FS bytes used 2.06TB
devid 7 size 1.82TB used 527.77GB path /dev/sdk1
devid 8 size 1.82TB used 527.77GB path /dev/sdg1
devid 6 size 1.82TB used 527.77GB path /dev/sdi1
devid 5 size 1.82TB used 527.77GB path /dev/sde1
devid 4 size 1.82TB used 527.77GB path /dev/sdj1
devid 2 size 1.82TB used 527.77GB path /dev/sdf1
devid 1 size 1.82TB used 527.77GB path /dev/sdh1
devid 3 size 1.82TB used 527.77GB path /dev/sdc1
This is running the Ubuntu build of kernel 3.9.4 and btrfs-progs from
git (v0.20-rc1-324-g650e656).
Am I being an idiot and missing something here? I must admit that I
still find the df output a bit cryptic (entirely my failure to
understand, nothing else), but on another system with only a single
device the "total" field returns the capacity of the device.
Cheers!
---tim
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