High-Voltage Dc Power; Internal Battery Feature; Power Capping; Power Estimation Tool - IBM z13s Technical Manual

non-raised floor environment, the
mandatory.

2.8.2 High-voltage DC power

In data centers today, many businesses pay increasingly expensive electric bills, and are
running out of power. The IBM z Systems CPC High Voltage Direct Current power feature
adds nominal 380 - 520 volt DC input power capability to the existing AC power capability. It
enables CPCs to directly use the high voltage (HV) DC distribution in new, green data
centers. A direct HV DC data center power design can improve data center energy efficiency
by removing the need for a DC to AC inversion step.
The IBM z Systems CPCs bulk power supplies have been modified to support HV DC, so the
only difference in shipped hardware to implement the option is the DC power cords. Because
HV DC is a new technology, there are multiple proposed standards.
The z13s CPC supports both ground-referenced and dual-polarity HV DC supplies, such as
+/- 190 V or +/- 260 V, or +380 V, and other supplies. Beyond the data center, uninterruptible
power supply (UPS), and power distribution energy savings, a zEnterprise CPC run on HV
DC power draws 1 - 3% less input power. HV DC does not change the number of power cords
that a system requires.

2.8.3 Internal Battery Feature

IBF is an optional feature on the z13s CPC server. See Figure 2-1 on page 36 for a pictorial
view of the location of this feature. This optional IBF provides the function of a local
uninterrupted power source (UPS).
The IBF further enhances the robustness of the power design, increasing power line
disturbance immunity. It provides battery power to preserve processor data during a loss of
power on all four AC feeds from the utility company. The IBF can hold power briefly during a
brownout, or for orderly shutdown during a longer outage. The values for the holdup time
depend on the I/O configuration, as shown in Table 10-2 on page 372.

2.8.4 Power capping

Power capping limits the maximum power consumption and reduces the cooling requirements
for the zBX. z13s servers do not support power capping.
The z13s system has a mechanism to vary the frequency and voltage that it supplies its
chips. The mechanism can be used to reduce the energy consumption of the system in
periods of low usage or for systems that are designed mainly for disaster recovery. The
mechanism is under the full control of the client. The client controls are implemented in the
HMC, SE, and Active Energy Manager where you can choose between High Performance
(default) or Low Power (power saving).The expectation is that the frequency change is 20%,
the voltage change is 9%, and the total power savings is 6% - 16%, depending on the
configuration.

2.8.5 Power Estimation tool

The Power Estimation tool for the z Systems CPCs enables you to enter your precise server
configuration to produce an estimate of power consumption:
1. Log in to Resource Link with any user ID.
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IBM z13s Technical Guide
Top Exit Power Top Exit I/O Cabling
and features are