# A Dynamic Decision Support System for Selection of Cloud Storage Provider
## 5 Results and Discussion
### Ranking Validation by Using AHP
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**Parameter** & **CPU** & **Rep** & **OS** & \
\begin{tabular}{c} **Mobile** \\ **Access** \\ \end{tabular} & **Sync** & **Sharing** &
\begin{tabular}{c} **Free** \\ **Storage** \\ \end{tabular} & **Trial** \\ \hline
**CPU** & 1 & 2 & 5 & 5 & 6 & 6 & 8 & 8 \\
**Rep** & 0.5 & 1 & 5 & 5 & 6 & 6 & 8 & 8 \\
**OS** & 0.2 & 0.2 & 1 & 2 & 5 & 5 & 9 \\
**Mobile Access** & 0.2 & 0.2 & 0.5 & 1 & 2 & 2 & 5 & 5 \\
**Sync** & 0.166 & 0.166 & 0.2 & 0.5 & 1 & 2 & 2 & 2 \\
**Sharing** & 0.166 & 0.166 & 0.2 & 0.5 & 0.5 & 1 & 5 & 5 \\
**Free Storage** & 0.125 & 0.125 & 0.2 & 0.2 & 0.5 & 0.2 & 1 & 2 \\
**Trial** & 0.125 & 0.125 & 0.11 & 0.2 & 0.5 & 0.2 & 0.5 & 1 \\ \(\tilde{\Sigma}\) & **2.482** & **3.982** & **12.21** & **14.4** & **21.5** & **22.4** & **34.5** & **40** \\ \hline \hline \end{tabular}
\end{table} 
Table 8: Column-Wise Sum of Parameter’s Weights. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Parameters** & **CPU** & **Rep** & **OS** & \
\begin{tabular}{c} **Mobile** \\ **Access** \\ \end{tabular} & **Sync** & **Sharing** &
\begin{tabular}{c} **Free** \\ **Storage** \\ \end{tabular} & **Trial** & **Priority** \\ \hline
**CPU** & 0.40 & 0.50 & 0.41 & 0.35 & 0.28 & 0.27 & 0.23 & 0.20 & 33.0\% \\
**Repository** & 0.20 & 0.25 & 0.41 & 0.35 & 0.28 & 0.27 & 0.23 & 0.20 & 27.3\% \\
**OS** & 0.08 & 0.05 & 0.08 & 0.14 & 0.23 & 0.22 & 0.14 & 0.23 & 14.7\% \\
**Mobile Access** & 0.08 & 0.05 & 0.04 & 0.07 & 0.09 & 0.09 & 0.14 & 0.13 & 8.7\% \\
**Sync** & 0.07 & 0.04 & 0.02 & 0.03 & 0.05 & 0.09 & 0.06 & 0.05 & 5.0\% \\
**Sharing** & 0.07 & 0.04 & 0.02 & 0.03 & 0.02 & 0.04 & 0.14 & 0.13 & 6.2\% \\
**Free Sto.** & 0.05 & 0.03 & 0.02 & 0.01 & 0.02 & 0.01 & 0.03 & 0.05 & 2.8\% \\
**Trial** & 0.05 & 0.03 & 0.01 & 0.01 & 0.02 & 0.01 & 0.01 & 0.03 & 2.2\% \\ \hline \hline \end{tabular}
\end{table} 
Table 9: Normalized Priority Vectors. In order to achieve uniformity of the repository parameter, all storage values are converted to gigabytes. A large gigabytes value has a higher priority; i.e., 250,000 GB has a 40% maximum priority, whereas for 500 GB, the priority is 2.1%. Table 14 shows a paired comparison of the free-storage parameter. All weighted and compared values are normalized, and the column-wise sum is calculated for further processing, as shown in Table 15. Subsequently, the priority for free storage is shown in Table 16. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Free Storage** & **50 GB** & **25 GB** & **10 GB** & **2 GB** \\ \hline
**50 GB** & 1.00 & 3.00 & 5.00 & 7.00 \\
**25 GB** & 0.33 & 1.00 & 0.33 & 0.20 \\
**10 GB** & 0.20 & 3.00 & 1.00 & 0.25 \\
**2 GB** & 0.14 & 5.00 & 4.00 & 1.00 \\ \(\sum\) & 1.68 & 12.00 & 10.33 & 8.45 \\ \hline \hline \end{tabular}
\end{table} 
Table 16: Priority of Free Storage Parameter. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Repository** & **250,000 GB** & **100,000 GB** & **50,000 GB** & **25,000 GB** & **10,000 GB** & **1000 GB** & **500 GB** \\ \hline
**250,000 GB** & 1.00 & 2.00 & 7.00 & 8.00 & 9.00 & 9.00 & 9.00 \\
**100,000 GB** & 0.50 & 1.00 & 4.00 & 7.00 & 8.00 & 9.00 & 9.00 \\
**50,000 GB** & 0.14 & 0.25 & 1.00 & 3.00 & 5.00 & 7.00 & 7.00 \\
**25,000 GB** & 0.13 & 0.14 & 0.33 & 1.00 & 4.00 & 5.00 & 7.00 \\
**10,000 GB** & 0.11 & 0.13 & 0.20 & 0.25 & 1.00 & 4.00 & 5.00 \\
**100 GB** & 0.11 & 0.11 & 0.14 & 0.20 & 0.25 & 1.00 & 2.00 \\
**500 GB** & 0.11 & 0.11 & 0.14 & 0.14 & 0.20 & 0.50 & 1.00 \\ \(\sum\) & **2.10** & **3.74** & **12.82** & **19.59** & **27.45** & **35.50** & **40.00** \\ \hline \hline \end{tabular}
\end{table} 
Table 12: Repository Parameter Paired Comparison in Decimal Form. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Free Storage** & **50 GB** & **25 GB** & **10 GB** & **2 GB** \\ \hline
**50 GB** & 1.00 & 3.00 & 5.00 & 7.00 \\
**25 GB** & 0.33 & 1.00 & 0.33 & 0.20 \\
**10 GB** & 0.20 & 3.00 & 1.00 & 0.25 \\
**2 GB** & 0.14 & 5.00 & 4.00 & 1.00 \\ \(\sum\) & 1.68 & 12.00 & 10.33 & 8.45 \\ \hline \hline \end{tabular}
\end{table}