It's not data pools. That's a way of managing and paying for Azure SQL Database, not something like the Data Lake (completely, utterly different technology), which is distributed storage. Within Azure SQL Database, it's Geo-Replication that does this.
"The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood"
- Theodore Roosevelt
Author of:
SQL Server Execution Plans
SQL Server Query Performance Tuning