# SCRATCH_DEV, in this case OVL_BASE_SCRATCH_DEV
# will be null, so check OVL_BASE_SCRATCH_DEV before
# running shutdown to avoid shutting down base fs accidently.
# SCRATCH_DEV, in this case OVL_BASE_SCRATCH_DEV
# will be null, so check OVL_BASE_SCRATCH_DEV before
# running shutdown to avoid shutting down base fs accidently.