Refer to Exhibit. Which type of replication is represented in the exhibit?

Question

Exhibit

Options

• ACascade/multihop, synchronous + disk buffered
• BCascade/multihop, synchronous + asynchronous
• CTriangle/multitarget, synchronous + disk buffered
• DTriangle/multitarget, synchronous + differential resync

• A
  74% (29)
• B
  5% (2)
• C
  5% (2)
• D
  15% (6)

Explanation

Three-site Replication: Cascade/Multiphop (Synchronous + Disk Buffered) In the cascade/multihop three-site replication, data flows from the source to the intermediate storage array, known as a bunker, in the first hop, and then, from a bunker to a storage array at a remote site in the second hop. Replication can be performed in two ways, synchronous+ disk- buffered or synchronous + asynchronous. Synchronous + Disk Buffered: This method employs a combination of local and remote replication technologies. Synchronous replication occurs between the source and the bunker; a consistent PIT local replica is created at the bunker. Data is transmitted from the local replica at the bunker to the remote replica at the remote site. Optionally, a local replica can be created at the remote site after data is received from the bunker. In this method, a minimum of 4 storage volumes are required (including the source) to replicate one storage device. RPO at the remote site is usually in the order of hours for this implementation.

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