1. A system, comprising: a plurality of storage nodes, wherein each of the plurality of storage nodes maintains respective replicas of a plurality of data volumes in block-based storage devices implemented at the storage node, wherein a write request received from a client for a data volume of the plurality of data volumes with replication enabled is completed at each respective replica of the data volume prior to acknowledging the write request to the client; each of the plurality of storage nodes, configured to: determine that a peer storage node of the plurality of storage nodes maintaining a same replica of a particular data volume of the plurality of data volumes as is maintained at the storage node is unavailable for replication; in response to determining that the peer storage node is unavailable, disable replication for the particular data volume, comprising: complete subsequently received write requests at the storage node; and acknowledge the completed write requests without completing the write request at any other storage node of the plurality of storage nodes.