- using block-level replication allows them to support multiple databases in a common way - block-level replication can be more reliable in the long run operat

- using block-level replication allows them to support multiple databases in a common way - block-level replication can be more reliable in the long run operationally than some types of database replication, especially MySQL back in the day - block-level replication has more scalable support staff available than hiring DBAs to fix database replication problems - programming for all the edge cases is something that is a competitive advantage - no licensing required for it - you can probably guess which Open Source project it's based on Source: DBA, worked there.