A customer runs production on one z14, with a zEC12 as a backup. The customer is planning a 50% capacity increase on both machines. Which of the following will satisfy the requirement?

Question

Options

• AA z14 upgrade and CBU for the zEC12.
• BUpgrade the z14 and migrate the zEC12 to a new z14 with a CBU feature.
• CA z14 upgrade and an equivalent zEC12 capacity upgrade for the backup situation.
• DA z14 upgrade and On/Off CoD for the zEC12.

• A
  3% (2)
• B
  6% (4)
• C
  75% (52)
• D
  16% (11)

Explanation

Option C is correct because the customer requires a permanent 50% capacity increase on both machines, which demands real hardware upgrades on each - not temporary or conditional capacity features. Upgrading the z14 (production) and performing an equivalent capacity upgrade on the zEC12 (backup) is the only option that delivers sustained, reliable capacity on both systems.

Why the distractors fail:

• A is wrong because CBU (Capacity Backup Upgrade) on the zEC12 provides only temporary, emergency-activated capacity for failover situations - it does not constitute a permanent 50% capacity increase.
• B is wrong for the same reason: replacing the zEC12 with a new z14 plus CBU still leaves the backup relying on temporary, conditionally-activated capacity rather than a permanent upgrade.
• D is wrong because On/Off CoD (Capacity on Demand) is designed for variable, short-term workload spikes - activating and deactivating capacity as needed - not as a substitute for a permanent capacity increase.

Memory tip: Both CBU and On/Off CoD are "on-demand" or "emergency" features - they activate capacity temporarily. Whenever an exam question asks about a planned, permanent capacity increase, these features are red herrings. If the requirement says "increase," think upgrade, not temporary activation.

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