SIC stands for Server Idle Coefficient. This is the ratio of a server's IT Workload to the server's energy consumption.
This Server Idle Coefficient (SIC) can be measured and gives a good idea of the extent to which a CPU of a server is active or not. If the CPU (almost) does not perform any tasks, we call this ‘idle’.
The SIC can be expressed in two ways:
- as a coefficient: a value between 0 and 10
- or as a percentage between 0 and 100%
If a server’s CPU is idle half the time processing an IT workload, the coefficient is 5. Expressed as a percentage, we speak of 50%. Both numbers therefore provide the same information, but presented in a different way.
What exactly does this mean? There appears to be no direct relationship between a server’s IT workload and the amount of energy that server uses. This means that if the SIC of this server is 5, half of the energy consumption of the server is therefore not used for an IT workload. In other words: 50% of the amount of energy that this server uses is not used for the tasks for which this server is actually intended: ‘running’ IT workloads.
De Data center Idle Coëfficient (DcIC) is het verhoudingsgetal voor alle servers bij elkaar in een datacenter. The Data Center Idle Coefficient (DcIC) is the ratio of all servers together in a data center.
The SIC and DCIC are based on the Covenant of Recognized Energy Measures of the Ministry of Economic Affairs & Climate. This arrangement came into effect at the beginning of 2022.
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