Reformat btrfs

run_list.sh

# Recreate cowdata
systemctl stop docker

umount -f /fastdata

umount -f /cowdata

# Above umount needs to succeed
# verify cowdata and fastdata are unmounted
df -h

# Reformat btrfs
wipefs -f -a /dev/md125

dd if=/dev/zero of=/dev/md125 bs=4M count=1

mkfs.btrfs -L cowdata /dev/md125

# Re-mount everything
mount -a

# Restart docker service
systemctl start docker

# Verify containers come up along with jenkins
docker ps

# Check dva-ci