Scenario: A DBA is tasked with creating a disaster recovery plan for a mission-critical DB2 database. What factors should be considered when designing the plan, and how can they ensure its effectiveness?

When designing a disaster recovery plan for a mission-critical DB2 database, several factors must be considered, including the recovery time objective (RTO) and recovery point objective (RPO), which define the acceptable downtime and data loss respectively. Additionally, the plan should outline data replication methods such as HADR or log shipping to ensure data redundancy and minimize data loss. Regular failover testing should be conducted to validate the effectiveness of the plan and identify any potential weaknesses that need to be addressed.