1. Requirements for computing room A. Gianoli, M. Serra, P. Valente

2. 2 rows: 18 + 18 racks

3. cpu/storage “guess” From “today” extimate (Alberto, Paolo, …) storage 200 ÷ 300 TB – ~24 TB/ box (raid 0+1), 800 Watt, 3 rack unit box – ~9 ÷ 13 box, ~7.2 ÷ 10.4 KW, 27 ÷ 39 rack unit CPU: 8core box, 500W, 2 rack unit (for network cards) – L1 ~30 ÷ 50 box, L2/L3 ~30 ÷ 35 box – ~60 ÷ 85 box, ~30 ÷ 42.5 KW, 120 ÷ 170 rack unit (LKr L1 downstairs) Total: ~37 ÷ 53 KW, 147 ÷ 209 rack unit, + networks switch

4. “space” there is space for 2 rows of 18 racks (40/42 units) for our needs should be enough 1 row but would be convinient to setup the water pipes (for rack cooling), the electric distribution and the network uprights to have an easy way to instrument the second row – the extra cost should be not so relevant water pipes under the floor electric blindo-barr (or cables?) from ceiling to rack power distribution network cables/fibers from ceiling is ok?

5. cooling having enough space It’s convinient to use ~half filled racks – cooling is less expensive and easier ( ~ 200 rack units -> 10 racks ) rack cooling via a rear door element – cooling capacity 10KW (this solution is becaming a cern standard) – water distribution to each door – external chiller (we have already the rack technical specification) “moderate” room cooling ~100 KW cooling chiller (safety factor ~2) – it is possible to optimize the tender

6. UPS and power distribution if we consider to instrument 1 row a ~120KVA UPS shuld be enough (safety factor ~2) – if we could have an expandable unit would be better (for the second row) blindo-barr vs traditional cabling? flexible main power panel?