What approaches would you take to ensure data quality and consistency in a distributed data store used by multiple microservices? Outline the techniques you'd apply and their potential impact on system performance.

``` Employ data validation at service boundaries combined with eventual consistency patterns and data replication strategies to ensure high availability and reliability. Scenario Pressure: What challenges might arise from asynchronous data replication? Depth Trigger: Discuss the impact of these strategies on read/write performance and overall system scalability. ```