Using btrfs progs 4.3.1 on a Vanilla kernel.org 4.1.15 kernel.
time btrfs device delete /dev/xvdh /backups
real 13936m56.796s
user 0m0.000s
sys 1351m48.280s
(which is about 9 days).
Where :
/dev/xvdh was 120gb in size.
/backups is a single / "raid 0" volume that now looks like :
Label: 'BACKUP_BTRFS_SNAPS' uuid: 6ee08c31-f310-4890-8424-b88bb77186ed
Total devices 3 FS bytes used 301.09GiB
devid 1 size 100.00GiB used 90.00GiB path /dev/xvdg
devid 3 size 220.00GiB used 196.06GiB path /dev/xvdi
devid 4 size 221.00GiB used 59.06GiB path /dev/xvdj
There are about 400 snapshots on it.
thanks
David.
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