Skip to main content

Table 1 An overview of federated cloud scenarios and their expected adaptation actions required to accomplish these scenarios

From: SCOPE: self-adaptive and policy-based data management middleware for federated clouds

# Scenarios/conditions Adaptation actions
1 CSP2 outperforms CSP1 (i.e., performance optimization) 1. Change storage policy to use CSP2 for the future data storage requests (instead of CSP1)
   1.1. Keep existing data in CSP1, OR
   1.2. Migrate existing data from CSP1 to CSP2
2 CSP2 is suffering from ongoing performance issues in peak-load condition 1. Add more storage nodes in CSP2 (i.e., scale-out), OR
   2. Temporary spill-over to CSP1
3 CSP2 offers a discount and storage price drops below that of CSP1 (i.e., cost optimization) 1. Change storage policy to use CSP2 for the future data storage requests (instead of CSP1)
   1.1. Keep existing data in CSP1, OR
   1.2. Migrate existing data from CSP1 to CSP2
4 The SLA of CSP1 offers higher availability than that of CSP2 1. Use CSP1 for the data, which requires higher availability
   1.1. Keep existing data in CSP2, OR
   1.2. Migrate existing data from CSP2 to CSP1