In the heterogeneous virtualization feature of Huawei storage, after the target storage completes the heterogeneous takeover of the source storage LUN, which of the following descriptions of writing…

Question

Options

• AWrite IO requires writing to source storage and target storage
• BWrite IO only needs to write to the source storage
• CWrite IO only needs to write to the target storage
• DYou can configure the command to set the write IO to write only to the target storage

• A
  79% (37)
• B
  11% (5)
• C
  6% (3)
• D
  4% (2)

Explanation

During heterogeneous takeover, the source storage still holds the authoritative data copy while migration is in progress. Write IO must land on both storages simultaneously to keep them in sync - if only the target received writes, a rollback or failover would expose stale data on the source; if only the source received writes, the target's copy would fall behind and data loss would occur upon cutover. Option D is wrong because dual-write is a mandatory system behavior enforced to guarantee consistency, not an optional setting configurable by command. Option B is wrong because it ignores the target entirely, making the takeover pointless. Option C is wrong because it would leave the source - still the fallback - with outdated data.

Memory tip: Think of heterogeneous takeover like a baton pass in a relay race - until the baton is fully in the next runner's hand, both runners must grip it. Neither can let go (stop receiving writes) until migration is complete.

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