What kind of 3DC networking does OceanStor Dorado NAS not support?

Question

Options

• AHyperactive + asynchronous
• BAsynchronous + asynchronous
• CHyperactive + synchronization
• DSynchronous + asynchronous

• A
  4% (2)
• B
  11% (5)
• C
  80% (37)
• D
  4% (2)

Explanation

Option C is correct because OceanStor Dorado NAS does not support combining HyperMetro (Hyperactive/Active-Active) replication with synchronous replication in a three-data-center topology - this pairing creates an unsupported configuration specifically for NAS services, even though it works for block storage in some scenarios.

Why the distractors are wrong:

• A (Hyperactive + Asynchronous) is supported: HyperMetro between two sites with asynchronous replication to a third site is a valid and common 3DC NAS design.
• B (Asynchronous + Asynchronous) is supported: running asynchronous replication to two separate remote sites is a straightforward 3DC configuration Dorado NAS handles.
• D (Synchronous + Asynchronous) is supported: synchronous replication to one remote site and asynchronous to a third is also a valid Dorado NAS 3DC topology.

Memory tip: Think "double-sync is the problem." HyperMetro is already a form of synchronous/active-active technology - combining it with another synchronous link in a 3DC NAS setup effectively doubles the synchronous burden in a way Dorado NAS cannot handle. If you see two "tight" (zero-RPO) technologies paired together for NAS in 3DC, that's the unsupported one.

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