# The 3MB guess is semi-arbitrary, but we've been informed that
# Lustre, for example, uses 1MB, so guess higher than that, at least.
block_size=$(bup-python -c \
# The 3MB guess is semi-arbitrary, but we've been informed that
# Lustre, for example, uses 1MB, so guess higher than that, at least.
block_size=$(bup-python -c \