Ultra-Dense Server Deployment in Racks

Compaq Ultra-Dense Server Deployment in Compaq Racks 33
128H-0400A-WWEN
3.4 Configuration-D: 42 De-rated Servers, Low Voltage
The following calculation verifies supporting 42 servers (de-rated Power Budget) with 24A Low Voltage
PDUs:
Since there are 4 PDUs supporting 42 servers, each PDU will need to support up to 11 servers. A
24A Low Voltage PDU supporting 11 servers can allocate each server with maximum current of (24/11=)
2.19A. Assuming 110V, the allocated maximum input power for each server will be
2.19A * 110V = 241W
The maximum thermal dissipation per server will be
241W * 3.41 = 822 BTUs/hour
For 42 servers, the total thermal dissipation will be (822*42=) 34,524 BTUs/hour
.
In Section 2.2, a fully configured system was measured to consume lower than 200W (Table 2-3, Server
Configuration-5). Hence, if each de-rated server configuration input power is lower than 241W then 42
servers can be supported via this configuration summary.
Configuration-D Summary
Rack Contents
Units
42 servers with all fixed or all sliding rails with cable trays
4 Low Voltage 24A PDUs vertically mounted in the side panel compartments
Internal Cables
42 power cords going to 4 PDUs in the side panels [These cables are supplied
with the servers.]
Cables External to Rack
42 (management) network cables from the optional Remote Insight Lights-Out
Edition’s RJ45 connector to external switches
42 (data) network cables from on-board RJ-45 to external switches, assuming
use of only one LAN connection per server
4 input power cords from the rack to external power outlets
Site Utility Requirements (worst-case)
Power: 4 dedicated 100V-120V 30A branch circuits.
Thermal: up to 34,520 BTUs/hour [This number is a worst-case. The actual
BTUs/hour will depend on the OS/application software running and the
server hardware configurations.]
Weight: up to 1,690 lb (with sliding-rails) [The network cables are not
accounted for since most implementations route the network cables to the
ceiling-hung cable rails outside of the rack.]
22 Server 22
21 Server 21
20 Server 20
19 Server 19
17 Server 17
18 Server 18
16 Server 16
15 Server 15
14 Server 14
13 Server 13
12 Server 12
11 Server 11
10 Server 10
35 Server 35
36 Server 36
34 Server 34
33 Server 33
32 Server 32
30 Server 30
31 Server 31
29 Server 29
28 Server 28
27 Server 27
42 Server 42
40 Server 40
41 Server 41
39 Server 39
38 Server 38
37 Server 37
26 Server 26
25 Server 25
24 Server 24
23 Server 23
8 Server 8
9 Server 9
7 Server 7
6 Server 6
5 Server 5
4 Server 4
3 Server 3
2 Server 2
1 Server 1