Chapter 3: What Is an Enterprise Cloud? 31
Figure 3-2: Understand how the universal control plane supports enterprise cloud.
Instant elastic consumption
The best part about implementing services on the public cloud is the ability to expand and contract usage on the fly. If you consider typical legacy enterprise environments, this isn’ t generally the case, for a variety of reasons:
✓ Overbuying is rampant. Because of the way replacement cycles operate and the services that have been available, many IT pros overbuy hardware, especially storage. You don’ t want to end up buying more storage mid‐cycle. Further, many SAN vendors make their best offers up front, but the discounts might be a bit less generous when your back is against the wall and your capacity is dwindling.
✓ Expansion can be difficult. Adding capacity requires downtime and is sometimes fraught with risk because you must match firmware versions on controllers, disks, and other elements.
✓ Resources can be tough to align. Because you must scale resources individually in legacy infrastructure environments, growth can require lots of planning and effort.
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