Ultra-Dense Server Deployment in Racks

Compaq Ultra-Dense Server Deployment in Compaq Racks 23
128H-0400A-WWEN
2.4 PDU Requirements
This section describes the Compaq PDU types available, and explains the number of PDUs needed. After
reading this section, customers can plan for the necessary facility power lines and circuit breakers to
support a maximum number of ProLiant DL360 servers in a 42U rack.
We have described the power ratings of ProLiant DL360 and Compaq PDU choices in Section 2.1 and 2.3
respectively. The type and number of PDUs required for a rack will depend on the power requirements for
each ProLiant DL360 server, the power source available for a rack, the console management method, and
the number of servers to be deployed in a rack.
The input current requirement (at an input line voltage level) for a ProLiant DL360 server is one of the
most important numbers in planning for a rack configuration. Considering the full rating for each
ProLiant DL360 server, the input current for each server will be 1.41A @208V, or 2.66A @110V. The
number of servers supported by a PDU is calculated by dividing the PDU rated current (at an input voltage
level) by the input current:
For example, for the input current rated to be
• 1.41A at 208V input voltage and using a High Voltage 24A PDU (P/N 295363-003),
Number of Servers to be supported by a PDU = 24A /1.41A = 17.02
Therefore, up to 17 servers can be supported by a 24A High Voltage PDU. That means, 3 PDUs will
be needed to support 42 servers (at full server rating).
• 2.66A at 110V input voltage and using a Low Voltage 24A PDU (P/N 295363-001),
Number of Servers to be supported by a PDU = 24A /2.66A = 9.02
Therefore, up to 9 servers can be supported by a 24A Low Voltage PDU. That means, 5 PDUs will be
needed to support 42 servers (at full server rating). However, since a Compaq 42U rack can
accommodate up to 4 PDUs in the side panel compartments, only 36 servers can be supported at the
input voltage level. The PDU installation in a Compaq 42U rack are described in Section 4.3.
The number of PDUs necessary or installable for a populated 42U rack with maximum number of
ProLiant DL360 servers will be as follows:
Table 2-6. PDUs/rack and Servers/PDU
Input
Voltage
PDU Current
Rating
Input Current Rating
per ProLiant DL360
Max. #
Servers
/PDU
# PDUs
needed or
installable
Max. #
Servers in a
42U Rack
208V 24A 1.41A 17 3 42
230V 16A 1.27A 12 4 42
220V 16A 1.33A 12 4 42
208V 16A 1.41A 11 4 42
110V 24A 2.66A 9 4 36
100V 24A 2.92A 8 4 32
The ProLiant DL360 power supply supports both low voltage (100V-120V) and high voltage (200V-
240V). The power supply automatically senses input voltage level.
Note: There is neither a DC-input power supply nor a redundant power supply for the ProLiant DL360.
Number of Servers to be supported by a PDU = PDU rated current / Server rated input current