Segmented Power Distribution - HP ProLiant DL140 - G2 Server Introduction Manual

Segmented power distribution

In high-density systems where a single rack can support hundreds of users at a time, the power
infrastructure should be designed so that a single system failure will have minimal effect on overall
operations. Segmenting servers into groups for power distribution reduces the chance for unscheduled
downtime resulting from overload or maintenance conditions that might otherwise shut down
everything else in the rack. Segmenting servers into two or more groups also facilitates proper cable
management and serviceability.
Segmenting can reduce the amount of inrush current associated with servers by allowing IT
administrators to sequentially power up server groups. Circuits can be segmented by using a modular
system of control cores and extension strips (Figure 5A) or by using monitored PDUs that individually
support multiple load segments (Figure 5B). In either case, a circuit breaker is associated with each
load segment (LS).
Figure 5. Segmented power distribution
A. Segmenting with
HP Modular PDU components
LS1
Ext.
Strip
PS A
LS2
Ext.
Strip
PS A
To other
extension strips
Control Core
VAC input
PS B
HP ProLiant
servers
1 thru 8
PS B
HP ProLiant
servers
9 thru 16
B. Segmenting with an
HP Monitored PDU component
PDU
PS A
LS1
LS2
PS A
LS3
PS A
VAC input
PS B
HP ProLiant
servers
1 thru 8
PS B
HP ProLiant
servers
9 thru 16
PS B
HP ProLiant
servers
17 thru 24
7