A customer is required to keep three copies of data by government regulation. They have questions about ECS recoverability from multiple site failures. Which two statements are true regarding…

Question

Options

• AIf there is a second site failure that occurs after PSO completed and after data recovery completes,
• BIf there is a second site failure that occurs after PSO completed but before data recovery completes,
• CECS supports recovery from multiple site failures under any condition if the surviving site has
• DECS can recover from multiple site failures if both PSO and data recovery operations complete

• A
  28% (7)
• B
  60% (15)
• C
  12% (3)

Explanation

ECS Multiple Site Failure Recovery

Options B and D are correct because they identify the two specific conditions under which ECS can successfully recover from a second site failure.

Why D is correct: When both PSO (Permanent Site Outage declaration) and data recovery complete after the first failure, ECS has fully re-established all three required data copies across surviving sites. At that point, the system is back to its protected baseline and is capable of surviving another site loss - recovery between failures is complete.

Why B is correct: Once PSO completes, ECS has officially acknowledged the first site as permanently lost and has catalogued all data that needs reconstruction. Even if data recovery hasn't finished yet, ECS retains enough metadata and surviving data fragments on the remaining sites to handle a second failure and still reconstruct all objects - the system is in a known, manageable state.

Why A is wrong: Option A describes a second failure occurring after both PSO and data recovery complete - but that scenario is correctly described by D as recoverable, making A a redundant or falsely-stated version of the same condition.

Why C is wrong: ECS does not recover from multiple site failures under any condition. Recovery depends on the sequence of events (PSO must be declared) and the surviving site having sufficient data. "Under any condition" is an absolute claim ECS cannot fulfill.

Memory tip: Think of it as a checkpoint system - PSO is Checkpoint 1, Data Recovery is Checkpoint 2. ECS can survive a second hit if you've at least reached Checkpoint 1 (B) or completed both checkpoints (D). If you've reached neither, you're unprotected.

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