Power And Cooling; Power Considerations - IBM z13s Technical Manual

A cross-over does not necessarily mean that the CP count for the additional temporary
capacity increases. The same D03 can temporarily be upgraded to a server with model
capacity identifier F03. In this case, the number of CPs does not increase, but more
temporary capacity is achieved.
On/Off CoD guidelines
When you request temporary capacity, consider the following guidelines:
Temporary capacity must be greater than permanent capacity.
Temporary capacity cannot be more than double the purchased capacity.
On/Off CoD cannot decrease the number of engines on the server.
Adding more engines than are currently installed is not possible.
For more information about temporary capacity increases, see Chapter 8, "System upgrades"
on page 311.

2.8 Power and cooling

As environmental concerns increase the focus on energy consumption, z13s servers offer a
holistic focus on the environment. New efficiencies and functions, such as energy optimizer
advisor, enable a dramatic reduction of energy usage and floor space when consolidating
workloads from distributed servers.
The power service specifications for the zEnterprise CPCs are the same as their particular
predecessors, but the power consumption is more efficient. A fully loaded z13s CPC
maximum power consumption is nearly the same as a zBC12. However, with a maximum
performance ratio of 1.58:1, it has a much higher exploitation on the same footprint.

2.8.1 Power considerations

The z Systems CPCs operate with two redundant power supplies. Each power supply has an
individual power cord for the z13s server.
For redundancy, the servers have two power feeds. Power cords attach either 50/60
hertz (Hz), alternating current (AC) power single-phase
- 480 V AC power, or 380 - 520 V direct current (DC) power. The total loss of one power feed
has no effect on system operation.
A Balanced Power Plan Ahead feature is available for future growth that helps ensure
adequate and balanced power with AC power cord selection by using three-phase power.
With this feature, downtimes for upgrading a server are eliminated by including the maximum
power requirements in terms of bulk power regulators (BPRs) and power cords to your
installation. For ancillary equipment, such as the HMC, its display, and its modem, extra
single-phase outlets are required.
The power requirements depend on the number of processor and I/O drawers in the z13s
server. Table 10-1 on page 372 shows the maximum power consumption tables for the
various configurations and environments.
z13s servers can operate in raised floor and non-raised-floor environments. For both types of
installation, an overhead power cable option for the top exit of the cables is available. For a
3
Only available on select z13s configurations, see Table 10-1 on page 372.
3
200 - 415 volt (v) or three-phase 200
Chapter 2. Central processor complex hardware components
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