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SG0-001 · Question #163

A customer has a SQL server with data and log files stored on the SAN. Data is replicated to an offsite SAN every night for the database and every hour for the log files. In the event of a failure, th

The correct answer is A. The RTO is 5 hours, the RPO is one hour and the copy is disk to disk. The RTO is 5 hours, representing the maximum time to restore service, while the RPO is one hour, indicating the maximum data loss due to hourly log file replication; the replication method used is disk-to-disk.

Storage Functionality

Question

A customer has a SQL server with data and log files stored on the SAN. Data is replicated to an offsite SAN every night for the database and every hour for the log files. In the event of a failure, the SQL server can be brought up at the offsite location within 5 hours. Which of the following is true?

Options

  • AThe RTO is 5 hours, the RPO is one hour and the copy is disk to disk
  • BThe RTO is one hour, the RPO is 5 hours and the copy is disk to tape
  • CThe RTO is one hour, the RPO is 5 hours and the copy is disk to disk
  • DThe RTO is 5 hours, the RPO is one hour and the copy is disk to tape

How the community answered

(61 responses)
  • A
    75% (46)
  • B
    13% (8)
  • C
    3% (2)
  • D
    8% (5)

Why each option

The RTO is 5 hours, representing the maximum time to restore service, while the RPO is one hour, indicating the maximum data loss due to hourly log file replication; the replication method used is disk-to-disk.

AThe RTO is 5 hours, the RPO is one hour and the copy is disk to diskCorrect

The Recovery Time Objective (RTO) is the maximum acceptable downtime for a service, which is stated as 5 hours to bring the SQL server online. The Recovery Point Objective (RPO) is the maximum acceptable data loss, and since log files are replicated hourly, the maximum data loss would be one hour of logs. The phrase "replicated to an offsite SAN" explicitly indicates a disk-to-disk replication method.

BThe RTO is one hour, the RPO is 5 hours and the copy is disk to tape

This choice incorrectly reverses the RTO and RPO values and incorrectly states the copy as disk to tape, when it is disk to disk (SAN to SAN).

CThe RTO is one hour, the RPO is 5 hours and the copy is disk to disk

This choice incorrectly reverses the RTO and RPO values, although it correctly identifies the copy as disk to disk.

DThe RTO is 5 hours, the RPO is one hour and the copy is disk to tape

This choice incorrectly identifies the copy as disk to tape, when the replication from SAN to SAN clearly indicates a disk to disk copy.

Concept tested: RTO, RPO, and replication methods

Source: https://learn.microsoft.com/en-us/azure/architecture/resiliency/recovery-objectives

Topics

#RTO#RPO#Data replication#Disaster recovery

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