Which two mechanisms are used to maintain redundancy after a disk failure on a VSP Midrange system? (Choose two.)

Question

Options

• AQuick Copy
• BDynamic Sparing
• CEmergency Destage
• DCorrection Copy

• A
  2% (1)
• B
  92% (48)
• C
  6% (3)

Explanation

Dynamic Sparing (B) and Correction Copy (D) work together as a two-phase response to disk failure. Dynamic Sparing automatically assigns a hot spare drive to replace the failed one, logically substituting it into the RAID group immediately. Correction Copy then rebuilds the data onto that spare by reconstructing it from the remaining drives' parity/mirror data, fully restoring redundancy.

Why the distractors are wrong:

• A. Quick Copy is a replication feature used to create point-in-time volume copies for backup or cloning - it has no role in failure recovery.
• C. Emergency Destage is a cache protection mechanism that flushes write-pending data from cache to disk when a power or cache failure is imminent - unrelated to RAID rebuilding.

Memory tip: Think of it as a two-act play - Dynamic Sparing casts the understudy (spare drive), then Correction Copy rehearses it to learn the part (rebuilds the data). Quick Copy and Emergency Destage are backstage crew for entirely different jobs (replication and cache safety, respectively).

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