Scalability up and out
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Scalability level up and out | Version: | 0.1 | 
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| Document type: | QAdefinition | Owner: |
Adaptability up and out has ordinal number 30. It's one-sentence description is:
"Capacity can be scaled both upward and outward".
When a facility can scale both upward and outward, capacity increase is relatively easy. Capacity decrease is not foreseen, and thus relatively difficult. Examples are:
- a central storage pool in a SAN is often easily expandable either by adding extra cabinets to a node, or by adding nodes to the SAN. Reduction of capacity is hard, mainly because hardware that's this much specialized is not easily returned to the vendor.
- a Local Area Network can often be expanded by upgrading blades in a modular switch (or adding blades to empty slots), as well as by adding more equipment. Again, there usually are no provisions to return hardware to the vendor.