Commit 28abd0f1 authored by Michael Davis's avatar Michael Davis
Browse files

[CHEP] Copy/paste images from presentation

parent 0d10ce7d
......@@ -59,12 +59,13 @@ will interface with EOS and CTA.
\begin{figure}[t]
\centering\includegraphics[width=0.9\textwidth]{images/Storage}
\end{figure}
\subsubsection{Data for online analysis stored on tape (``Data Carousel'')}
Source:~\cite{xin_zhao_tape_usage}
\begin{figure}[t]
\includegraphics[width=\textwidth]{images/DataCarousel.png}
\includegraphics[width=\textwidth]{images/DataCarouselChart.png}\\[2ex]
Source:~\cite{xin_zhao_tape_usage}
\end{figure}
\begin{figure}[t]
\includegraphics[width=\textwidth]{images/DataCarouselChart.png}
\end{figure}
\section{CASTOR to CTA}
......@@ -79,44 +80,40 @@ will interface with EOS and CTA.
\includegraphics[width=\textwidth]{images/CTA_Arch3A}
\end{figure}
\begin{figure}[t]
\begin{itemize}
\item Object Store is used for transient requests, queues, statuses and agents\\[2ex]
\item No direct Inter-Process Communication\\[2ex]
\item Object Store is used for transient requests, queues, statuses and agents
\item No direct Inter-Process Communication
\item Resilience against crashes
{\small
\begin{itemize}
\item Guaranteed coherency
\item Agent heartbeat, garbage collection\\[2ex]
\item Agent heartbeat, garbage collection
\end{itemize}
}
\item Distributed architecture
{\small
\begin{itemize}
\item Allows multiple redundant RADOS instances/CTA Frontends
\item Scale-out scalability\\[2ex]
\item Scale-out scalability
\end{itemize}
}
\item No single point of failure
\end{itemize}
\end{figure}
\subsection{CTA Architecture}
\vspace{2ex}
{\textcolor{cern@dkblue}{\Large CTA offers the ``Best of Both Worlds''}}\\[1ex]
\subsubsection{CTA offers the ``Best of Both Worlds''}
\begin{itemize}
\item User interface, file access and disk pool management ~ from EOS
\item User interface, file access and disk pool management from EOS
\item Tape system management from CASTOR
\item New scalable, robust queuing system to link the two\\[4ex]
\item New scalable, robust queuing system to link the two
\end{itemize}
{\textcolor{cern@dkblue}{\Large CTA design principles}}\\[1ex]
\subsubsection{CTA design principles}
\begin{itemize}
\item Simplicity
\item Scalability
\item Performance\\[4ex]
\item Performance
\end{itemize}
%{\leftskip1em\rightskip\leftskip\scriptsize\color{black}For more details see:
Full details:~\cite{chep2016}
For more details see:~\cite{chep2016}
\subsection{CTA Architecture}
\begin{figure}[t]
......@@ -158,9 +155,8 @@ will interface with EOS and CTA.
\end{figure}
\subsection{System Testing}
% The scale and stress tests show that the system can operate under a load much heavier than what
% we currently see in operation.
% 100 Hz graph : CASTOR typically operates at not more than 10 Hz.
The scale and stress tests show that the system can operate under a load much heavier than what we currently see in operation.
100 Hz graph : CASTOR typically operates at not more than 10 Hz.
% Queuing : fill/drain ; first mount after 2 hours ; fill rate slows after 8 hours ? ; final steep gradient is final drain after writing stops
\begin{figure}[t]
\centering
......@@ -186,30 +182,27 @@ will interface with EOS and CTA.
\includegraphics[width=\textwidth]{images/Migration}
\end{figure}
\section{Summary}
\section{Conclusions}
\label{conclusions}
\subsection{CERN Tape Archive : Summary}
{\textcolor{cern@dkblue}{\Large Use cases for tape archival are changing}}\\[1ex]
Use cases for tape archival are changing
\begin{itemize}
\item Increased rate of data taking for Run 3 and HL-LHC
\item Data for online analysis accessed via ``Data Carousel''\\[2ex]
\item Data for online analysis accessed via ``Data Carousel''
\end{itemize}
{\textcolor{cern@dkblue}{\Large CTA is the ``Best of Both Worlds'' ---\\[1ex]
\hspace{7em}EOS disk and CASTOR tape}}\\[1ex]
CTA is the ``Best of Both Worlds'' --- EOS disk and CASTOR tape
\begin{itemize}
\item Simplicity
\item Scalability
\item Performance\\[2ex]
\item Performance
\end{itemize}
{\textcolor{cern@dkblue}{\Large Deployment}}\\[1ex]
Deployment
\begin{itemize}
\item Now: Field test instances with redundant copies of data
\item LS2: Migration from CASTOR to CTA
\end{itemize}
\section{Conclusions}
\label{conclusions}
%
% ---- Bibliography ----
%
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