Ultra-Dense Server Deployment in Racks

Compaq Ultra-Dense Server Deployment in Compaq Racks 27
128H-0400A-WWEN
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
3.1 Configuration-A: 42 De-rated Servers, High Voltage
This configuration shows a “best practice” for a 42U rack with 42 servers in a high voltage facility (North
America only) where a deployment plan can accommodate the de-rating of each ProLiant DL360 server.
Section 2.2 explains power budgeting methods and measured power for different base-line configurations
and subsystem components. The following calculation verifies supporting 42 servers with 24A High
Voltage PDUs:
Since there are 2 PDUs to support 42 servers, each PDU needs to support 21 servers. A 24A High Voltage
PDU supporting 21 servers can allocate each server with maximum current of (24/21=) 1.143A @ 208V.
Therefore, the allocated maximum input power for each server will be
1.143A * 208V = 238W
The maximum thermal dissipation per server will be
238W * 3.41 = 812 BTUs/hour
For 42 servers, the total thermal dissipation will be (812*42=) 34,104 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 238W then 42
servers can be supported via this configuration summary.
Configuration-A Summary
Rack Contents
Units
42 servers with all fixed or all sliding rails with cable trays
2 High Voltage 24A PDUs vertically mounted in the side panel compartments
Internal Cables
22 Y-power cords going to 2 PDUs in the side panels
Cables External to Rack
42 (management) network cables from the optional Remote Insight Lights-Out
Edition RJ45 connectors to external switches
42 (data) network cables from on-board RJ-45 to external switches, assuming
use of only one LAN connection per server
2 input power cords from the rack to external power outlets
Site Utility Requirements (worst-case)
Power: 2 dedicated 200V-240V 30A branch circuits.
Thermal: up to 34,100 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 1,665 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.]
BEST PRACTICE