Choose your key figures and observe the changes on the label.

pt

pt

pt

Help us to make the DC label even more practice-orientated! We have prepared various questions and would be very pleased if you took the time to answer them:

Please give your feedback here...This value is used to weight the individual LC values:

The Power Usage Effectiveness (PUE) is defined according to DIN EN 50600-4-2 as:

With:

E

_{DC}the total energy consumption of the data centre (annually) in kWh,E

_{IT}the energy consumption of the IT equipment (annually) in kWh.

These typical PUE values are converted into an energy efficiency index (EEI) between 0 points (worst value) and 100 points (best value) using the formula described below:

PUE > 2.5 is set to 0 points, PUE < 1.1 is set to 100 points.

The Cooling Efficiency Ratio (CER) is defined according to DIN EN 50600-4-7 as:

With:

Q

_{dissipated }as the total (annual) amount of heat dissipated from the data centre in kWh,E

_{cooling }as the (annual) energy consumption of the cooling systems in kWh.

The value range of the CER is mapped linearly from [1;9] to [0;100] for the energy efficiency index:

CER ≤ 1 is set to 0 points, CER > 9 is set to 100 points.

The Energy Reuse Factor (ERF) is defined according to DIN EN 50600-4-6 as:

With:

E

_{Reuse}as (annual) energy from the data centre in kWh that is used outside the data centre and completely or partially replaces energy there,E

_{DC}as the (annual) total energy consumption of the data centre in kWh.

The CER is converted as follows for the energy efficiency index from 0 to 100 points:

ERF > 0.9 is set to 100 points.

The
*load correlation (LC)*
describes how well IT utilisation correlates with energy utilisation.
The already established key figure IT Equipment Utilisation of
Servers (ITEU_{SV})
is used as a value for the annual average CPU utilisation of all
servers.

It is defined:

With:

LC

_{Server }as dimensionless load correlation of the servers (0 to 100%),ITEU

_{SV}as average (annual) CPU utilisation of the servers (0 to 100%),E

_{Server }as (annual) energy consumption of all servers in kWh,P

_{Server_max }as the sum of the maximum power consumption of all servers in full load mode in kW,t as the measurement period in hours, for an annual value this corresponds to 8760h.

The
useful work of the storage system usually consists of storage space
allocation. It is therefore defined that the load correlation for
storage systems (LC_{Storage})
is the ratio between percentage storage utilisation and proportional
energy consumption of the storage to its maximum energy consumption:

With:

LC

_{Storage}as dimensionless load correlation of the storage systems (0 to 100%),Storage_Utilisation as average (annual) storage space utilisation (0 to 100%),

E

_{Storage}as (annual) energy consumption of all storage systems in kWh,P

_{Storage_max }as the sum of the maximum power consumption of all fully occupied storage systems in kW,t as the measurement period in hours, for an annual value this corresponds to 8760h.

For
storage systems, it can be argued that their energy consumption does
not correlate with storage space utilisation, but rather with data
throughput during read and write activities. Therefore, if the
storage space utilisation is taken as the unit of useful work, the
energy consumption remains constant. To simplify, both energy
consumptions E_{Storage }and
(P_{Storage_max }*
t) can be set equal, which leads to a denominator of 1 and allows the
following simplification of the calculation rule:

The load correlation of network devices is defined as the ratio of the Network Utilisation (ratio of the number of connected ports with the number of available ports) and the quotient of measured energy consumption to the maximum energy consumption with full port occupancy:

With:

LC

_{Network }as dimensionless load correlation of the network (0 to 100%),Network_Utilisation as the average (annual) utilisation of physical ports (0 to 100%),

E

_{Network }as (annual) energy consumption of all network devices in kWh,P

_{Network_max}as the sum of the maximum power consumption of all network devices with fully occupied ports in kW,t as the measurement period in hours, for an annual value this corresponds to 8760h.

And:

*Ports
*here refers to the number of physical
ports of all multiport bridge devices.