Which HA solution involves multiple systems all of which are online and actively processing traffic or data?
A.
Active-active cluster
B.
Active-passive cluster
C.
Database shadowing
D.
Remote journaling
Explanation:
Answer A is correct; an active-active cluster involves multiple systems all of which are online and actively processing traffic or data. This configuration is also commonly referred to as load balancing, and is especially common with public facing systems such as Web server farms.Incorrect Answers and Explanations: B, C, and D: Answers B, C, and D are incorrect. An active-passive involves devices or systems that are already in place, configured, powered on and ready to begin processing network traffic should a failure occur on the primary system. Database shadowing uses two or more identical databases which are updated simultaneously. Remote journaling saves the database checkpoints and database journal to a remote site. In the event of failure at the primary site, the database may be recovered.