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\midrule - ExaDigiT~\cite{DBLP:conf/sc/BrewerMKWBHSGGW24} & CFD/HT, AI/ML & Energy Loss\newline Prediction,\newline \fcolorbox{Red}{white}{Heat Modelling} & HPC Engineers and Operators & \fcolorbox{Red}{white}{3D\textsuperscript{$\star$}}, \fcolorbox{Red}{white}{CH\textsuperscript{$\dingasterisk$}}, VP\textsuperscript{$\star$}, PE\textsuperscript{$\dingasterisk$}, RA, SE\textsuperscript{$\thermod$} \\ - \midrule - SmartDC~\cite{DBLP:conf/noms/ZhangZLZWC22} & CFD/HT, BIM, AI/ML & \fcolorbox{Red}{white}{Heat Modelling},\newline PUE optimization & Cloud Datacenter Engineers & \fcolorbox{Red}{white}{CH\textsuperscript{$\thermod$}}, PE, \fcolorbox{Red}{white}{3D\textsuperscript{$\star$}} \\ - \midrule - DyTwin~\cite{DBLP:conf/sc/TaheriBPRHDEWPM24} & Gaussian Process Regression, AI/ML & Anomaly Detection & Cloud Datacenter Operators & A\textsuperscript{$\star$}, FD, VP\textsuperscript{$\star$}, SE\textsuperscript{$\thermod$} \\ - \midrule - ChatTwin~\cite{DBLP:conf/sensys/LiW0Z0T23} & \textbf{\footnotesize?} & Digital Twin\newline Definition Language & Cloud Datacenter Engineers & \fcolorbox{Red}{white}{ 3D\textsuperscript{$\star$}} \\ - \midrule - Reducio~\cite{DBLP:conf/sensys/CaoW0022} & POD, Gaussian\newline Process Modelling (ML) & \fcolorbox{Red}{white}{Heat Modelling} & Edge and Hyper-scale Datacenter Operators & \fcolorbox{Red}{white}{CH\textsuperscript{$\dingasterisk$}, 3D\textsuperscript{$\star$}}, SE \\ - \midrule - NetGraph~\cite{DBLP:conf/sigcomm/HongWDSSHZY21} & Graphs & Network Management & Cloud Datacenter Operators & VP\textsuperscript{$\star$}, RA\textsuperscript{$\star$}, - N\textsuperscript{$\star$}, SE\textsuperscript{$\thermod$} \\ - \midrule - Kalibre~\cite{DBLP:conf/sensys/WangZD0TCWZ20} & CFD/HT, ML & \fcolorbox{Red}{white}{Heat Modelling} & Cloud Datacenter Engineers & \fcolorbox{Red}{white}{CH\textsuperscript{$\dingasterisk$}, 3D\textsuperscript{$\star$}} \\ - \bottomrule - \end{tabular} - } - -\end{table} -\tiny \textbf{Table 1.1:} Comparison of selected datacenter digital twins. \textbf{Modelling capability:} \textcolor{Red}{3D = Visualizations}; \textcolor{Red}{CH = Cooling/Heat}, PE = Power/Energy Consumption, A = Anomaly Detection, N = Network Modelling, SE = Scenario Exploration, VP = Virtual Prototyping, FD = Federation, RA = Resource Allocation; \textbf{Data Analytics}: $\dingasterisk$ = Predictive Analysis; $\star$ = Descriptive Analysis, $\thermod$ = Prescriptive Analysis. -% Autonomous decisions (autonomous twinning) from~\cite{DBLP:conf/sc/BrewerMKWBHSGGW24} is inherent to digital twinning -- it is better left unsaid in the table. -% I.e., the foundation of any DT is autonomous decisions, so without them they don't qualify as a DT. -% ChatTwin mentions that they evaluate their system on their own-engineered digital twin, but they absolutely not name it. 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