Which of the following DR techniques uses a disk to update content in parallel with the main disk so a real-time backup is available?

Question

Options

• ALog shipping
• BMirroring
• CReplication
• DHigh availability

• A
  3% (1)
• B
  88% (28)
• C
  6% (2)
• D
  3% (1)

Explanation

Mirroring writes data simultaneously to two disks in real time, so if the primary disk fails, the mirror disk contains an exact, up-to-date copy - no data loss and no restore delay. Log shipping (A) periodically copies transaction logs to a standby server, introducing a time lag between the primary and backup, so it is not a real-time technique. Replication (C) copies data to another system or location but typically involves some latency and is used more for distribution/availability than as a pure real-time disk-to-disk backup mechanism. High availability (D) is a broader architectural goal (keeping systems operational), not a specific backup technique.

Memory tip: Think of a mirror - it reflects your image instantly and in parallel. That's exactly what disk mirroring does: every write hits both disks at the same time.

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