Ultra-Dense Server Deployment in Racks

Compaq Ultra-Dense Server Deployment in Compaq Racks 53
128H-0400A-WWEN
3.14 Configuration-N: 22U Rack, Low Voltage PDU
This configuration shows a maximum number of ProLiant DL360 servers in a Compaq 22U rack in a low
voltage facility. If console management is done via the optional Remote Insight Lights-Out Edition then
all network switches to where the network cables connect can be located in the same rack or elsewhere.
As explained in Section 2.4, a 24A Low Voltage PDU can support up to nine full-rated ProLiant DL360
servers. Therefore, with two 24A Low Voltage PDUs, 18 servers can be supported.
The configuration summary below is for the 18-server configuration.
Configuration-N Summary
Rack Contents
Units
18 servers with all fixed or all sliding rails with cable trays
2 Low Voltage 24A PDUs vertically mounted in the side panel compartments
Internal Cables
18 power cords going to 2 PDUs in the side panels [These cables are supplied
with the servers.]
Cables External to Rack
18 (management) network cables from the optional Remote Insight Lights-Out
Edition RJ4-5 connector to external switches
18 (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 100V-120V 30A branch circuits.
Thermal: up to 18,000 BTU [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 825 lb (with sliding-rails) [The network cables are not
accounted for since most implementation routes the network cables to the
ceiling-hung cable rails outside of the rack.]
22
21
20
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
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
22 servers can be used if the servers’ power budget is de-rated as follows:
The maximum current draw for each server when a 24A Low Voltage PDU is used to support 11
servers will be as follows:
Maximum input current per server = 24A / 11 servers = 2.19A @ 110V
That means the maximum input power each server can consume will be
2.19A * 110V = 241W
The maximum thermal dissipation per server will be
241W * 3.41 = 822 BTUs/hour
For 22 servers, the total thermal dissipation will be (822*22=) 18,084 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 22 servers can be supported via this configuration summary.