Disaster recovery for a distributed VDB
Disaster recovery (DR) ensures that a vector database cluster can survive the loss of a data center, region, or multiple nodes and resume service with acceptable data loss (RPO) and downtime (RTO). It combines backups, replication, and failover procedures.
Summary
- Disaster recovery (DR) ensures the cluster can survive loss of a data center, region, or multiple nodes and resume with acceptable data loss (RPO) and downtime (RTO). Combines backups, replication, and failover procedures.
- Key elements: backups (snapshots or continuous to durable storage); cross-region replication to a standby; failover (automated or manual switch to standby); understanding persistence and consistency for potential data loss. Split-brain prevention is critical.
- DR drills validate standby sync and application connectivity. Large indexes make full restores slow; incremental backups and replication reduce recovery time. Pipeline: backup to durable storage, replicate to standby region, on failure failover to standby. Practical tip: run DR drills regularly; use incremental backups and async replication to reduce RTO.
DR elements
Key elements: (1) Backups—periodic snapshots or continuous backup of vector indexes and metadata to durable storage (e.g. object store in another region). (2) Cross-region replication—async replication to a standby region so that data is available there; on primary failure, traffic is failed over to the standby. (3) Failover—automated or manual switch of clients to the standby cluster; may involve DNS or load balancer updates. (4) Consistency—understanding persistence guarantees and consistency levels so you know how much data might be lost (e.g. last few seconds of writes) after a failover.
Testing and split-brain
DR drills (regular failover tests) validate that the standby is in sync and that applications can connect to the new primary. For vector DBs, large indexes make full restores slow; incremental backups and replication reduce recovery time. Split-brain prevention is important so that after a partition, only one side is promoted and the other does not accept writes. Pipeline: backup to durable storage, replicate to standby region, on failure failover to standby (DNS or LB update). Practical tip: run DR drills regularly; use incremental backups and async replication to reduce RTO.
Frequently Asked Questions
What is disaster recovery for a VDB?
Ensuring the cluster can survive loss of a data center, region, or multiple nodes and resume with acceptable RPO (data loss) and RTO (downtime). Combines backups, replication, and failover. See cross-region replication.
What are the key DR elements?
Backups (periodic or continuous to durable storage); cross-region replication to a standby; failover (DNS or load balancer switch to standby); understanding persistence and consistency so you know how much data might be lost after failover.
Why is split-brain prevention important for DR?
After a partition, only one side should be promoted; the other must not accept writes. Otherwise you get split-brain and conflicting updates. Consensus and quorum ensure at most one partition can make progress. See Raft/Paxos.
How do I reduce recovery time?
Incremental backups and replication reduce recovery time; full restores of large vector indexes are slow. DR drills validate that the standby is in sync and applications can connect to the new primary.