stationwagon.py

# -- encoding: UTF-8 --

def dims_to_volume(dims):
    return dims[0] * dims[1] * dims[2]

# Taken from http://www.consumerreports.org/cro/2012/01/best-in-cargo-capacity-and-fuel-economy/index.htm
# [].slice.call(document.querySelector("table").querySelectorAll("td+td+td")).map(function(t){return parseFloat(t.innerHTML)})
cargo_volume_cuft = [
    61, 61.5, 70.5, 70.5, 62, 32, 28.5, 35.5, 33, 26, 37, 31.5, 28.5, 30.5, 36, 33, 32.5, 26, 26, 25.5, 35, 35, 31.5,
    31, 28, 26.5, 32, 32, 31, 30, 29.5, 28, 33.5, 40.5, 36.5, 34.5, 35.5, 37.5, 34.5, 33.5, 33.5, 33.5, 47, 40.5, 40.5,
    34, 39, 33, 47.5, 44.5, 44, 42, 39.5, 37.5, 36.5, 36.5, 33.5, 32, 28, 24.5, 24.5, 34, 39, 34, 31.5, 34, 28.5
]
cartridge_size_mm = (102, 105.4, 21.5)  # http://www-03.ibm.com/systems/storage/media/lto_5/specifications.html
ssd_size_mm = (70, 100, 15)  # http://www.snia.org/forums/sssi/knowledge/formfactors
tb_per_cartridge = 2.5 * 2.5  # 2.5 native capacity, 2.5:1 average compression
tb_per_ssd = 16


avg_cargo_volume_cuft = sum(cargo_volume_cuft) / len(cargo_volume_cuft)

cargo_volume_m3 = avg_cargo_volume_cuft / 35.3147
cargo_volume_mm3 = cargo_volume_m3 * 1000000000


cartridge_volume_mm3 = dims_to_volume(cartridge_size_mm)
ssd_volume_mm3 = dims_to_volume(ssd_size_mm)

ssds_per_station_wagon = cargo_volume_mm3 / ssd_volume_mm3
cartridges_per_station_wagon = cargo_volume_mm3 / cartridge_volume_mm3

lto6_tb_per_station_wagon = tb_per_cartridge * cartridges_per_station_wagon
samsung_tb_per_station_wagon = tb_per_ssd * ssds_per_station_wagon

print("LTO6 TBs per station wagon:", lto6_tb_per_station_wagon)
print("Samsung SSD TBs per station wagon:", samsung_tb_per_station_wagon)

# > LTO6 TBs per station wagon: 27 598
# > Samsung SSD TBs per station wagon: 155 531