1.Mode of operation of software where multiple independent instances share the same environment.
2.Physical environment is generally shared
+ Segmentation: Separating tenant resources/data/applications etc
+ Isolation: Logical isolation is often provided through virtualization.
+ Governance: Propose a data governance framework to ensure the privacy,availability,integrity and overall security of data in different cloud models.
+ Service levels: Document minimum expected performance
+ Chargeback and metering refers to the ability of an IT organization to track and measure the IT expenses per business unit and charge them back accordingly
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