• Does RAMCloud change the energy equation for a datacenter?
• What if discs were essentially never turned on? Would this improve energy usage dramatically?
  • After a very quick glance around:
  • current HDs: 9W active, some 8W idle, some down to 5W, 1W standby
  • current SSDs: 2.5W active, 0.06W idle
  • so, perhaps the elimination of up to 8W per disk
  • could save 80kW or on 10k machines, or more with any redundancy

* If we were to use flash based memory, like Fusion-IO for example, we could save even more power:

• • Current DRAMs - ~ 4.5 W per GB - 160/320 W for 32/64 GB respectively
  • Fusion IO drive - claims ~ 120 W for 160 GB device (last gen device costs ~ 30 - 40 $ per GB)
  • Latency: < 50 us for read