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However, there is an exception to that hypothetical balance - the security domain. All SDN systems implement some (or more) security domains, whether it’s client level or system-wide. To configure 2 or more SDN systems to cooperate simultaneously on that domain, might be more time consuming than to configure the whole system to adopt a new one.

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Storage

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domain

Warrens storage domain consists of three options:

• Distributed storage 

• Shared storage 

• Local storage

To determine the most desirable solution, the DC needs to consider several factors that are required to implement a particular storage type. Warren storage domain is based on distributed storage. In this chapter we explain why we have chosen it and how it compares to other popular solutions.

Storage holds the most valuable information - client application data, so the impact on the reliability and to Quality of Service is immense. In comparison network outage only affects the availability of data, whereas storage problems lead to permanent data loss.

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