In an OceanStor Dorado V6 Architecture with two controller enclosures and eight controllers, which scenarios are supported for high availability? (Multiple Choice)

Question

Options

• ATolerance of a single controller enclosure failure
• BTolerance of simultaneous failures of any two controllers
• CTolerance of simultaneous failures for seven controllers
• DTolerance of simultaneous failures for any three controllers

• A
  9% (3)
• B
  73% (24)
• C
  18% (6)

Explanation

In the OceanStor Dorado V6 architecture with 8 controllers, high availability is maintained through a quorum mechanism requiring a majority of controllers to remain operational. With 8 controllers, a majority means at least 5 must survive, so the system can tolerate the loss of up to 3 controllers simultaneously - making both B (any 2 failures) and D (any 3 failures) valid HA scenarios.

Option A is incorrect because a single enclosure failure takes down 4 of the 8 controllers at once, leaving exactly half (4) surviving - insufficient to form a quorum majority, so the system cannot continue operating in HA mode. Option C is incorrect because losing 7 controllers leaves only 1 survivor, which is far below any quorum threshold and would result in a complete system failure.

Memory tip: Apply the "majority rule" - with N controllers, you need more than N/2 to survive. With 8 controllers, 8/2 = 4, so you need at least 5 surviving, meaning you can lose at most 3. An entire enclosure equals 4 lost controllers, which crosses that line.

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