Verifying the Data Migration Progress - Amazon ElastiCache for Redis

Verifying the Data Migration Progress

After the migration has begun, you can do the following to track its progress:

  • Verify that Redis master_link_status is up in the INFO command on ElastiCache primary node. You can also find this information in the ElastiCache console. Select the cluster and under CloudWatch metrics, observe Master Link Health Status. After the value reaches 1, the data is in sync.

  • You can check that for the ElastiCache replica has an online state by running the INFO command on your Redis on EC2 instance. Doing this also provides information about replication lag.

  • Verify low client output buffer by using the CLIENT LIST Redis command on your Redis on EC2 instance.

After the migration is complete, the ElastiCache cluster shows the status of in-sync. This status means that all data is now replicated. The data is in sync with any new writes coming to the primary node of your Redis instance.