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BlobStorage has been designed to 

BlobStorage assumption :
\begin{enumerate}
\item No user size is big in comparison of all users
\end{enumerate}

BlobStorage properties :

\begin{enumerate}
\item Slow but constant reads
\item Scalable reads on one blob (time not growing with number of workers)
\item Scalable with number of workers (bandwidth of N workers is N*1 bandwidth)
\item Not designed so one blob is overwritten often (clocks + cost of overwritting all copy-blobs) 
\end{enumerate}

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