\begin{slide}{violet}
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\begin{center}
System Test
\end{center}

installed two system calls: 

\quad {\it set\_disk\_map()} kernel array disk\_map[i] = $P(i)$

\quad {\it disk\_map()} to enable/disable remapping

and driver instrumentation to measure service times

\quad\\
test workload:

stochastically generated stream of 250,000 requests from Markov model

results:

\quad \\
\begin{tabular}{|lcc|} \hline
\quad & Mean serv. (ms) & Improvement \\ \hline
Unmapped & 24.423321 & --- \\
Pipe organ & 19.217960 & 21.31\% \\
Markov & 18.158880 & 25.65\% \\ \hline
\end{tabular}
\end{slide}

