Provisioning and managing replicated data instances

A system, comprising:

• one or more processors;
• and
• a memory storing instructions that, when executed on or across the one or more processors, cause the one or more processors to:
• in response to a service request to scale storage for a replicated database having a first instance replica and a second instance, scale the storage for the first instance replica and the second instance replica, wherein the replicated database is configured to apply a write operation of the first instance replica to the second instance replica;
• generate a failover network address that points to the first instance replica;
• and
• in response to a failure of the first instance replica, redirect the failover network address to point to the second instance replica, wherein after redirecting, a received access request addressed to the failover network address is transmitted to the second instance replica.

One or more computer-readable storage media storing instructions that, when executed on or across one or more processors, cause the one or more processors to:

• in response to a service request to scale storage for a replicated database having a first instance replica and a second instance, scale the storage for the first instance replica and the second instance replica, wherein the replicated database is configured to apply a write operation of the first instance replica to the second instance replica;
• generate a failover network address that points to the first instance replica;
• and
• in response to a failure of the first instance replica, redirect the failover network address to point to the second instance replica, wherein after redirecting, a received access request addressed to the failover network address is transmitted to the second instance replica.