Business Continuity - HA/DR

High availability and disaster recovery you can prove. Not just configure.

Multi-AZ high availability and cross-region disaster recovery built into every engine, with automated failover and DR drills you can run as a routine operation, with full switchback, instead of a plan nobody has tested.

Talk to a Tessell engineerSee how a Fortune 500 bank runs quarterly DR drills →

Trusted by enterprises at scale

Fortune 500 US bank

Five-node cluster, quarterly DR drills, 15-min RPO

Fortune 500 insurance firm

RPO 0 / RTO 30 seconds

US state environmental agency

RTO 8 hours to automatic failover

Resilience is special to set up, risky to test, and rarely proven.

Most teams can configure HA and DR. Far fewer can show, on demand, that recovery actually works the way the plan says it does.
HA and DR are specialist, manual builds.

HA and DR are specialist, manual builds.

Setting up synchronous replication, configuring failover, and writing the runbooks takes deep, engine-specific expertise, and that knowledge usually sits with a handful of people.
DR stays theoretical until an incident.

DR stays theoretical until an incident.

Running a real drill can carry the same operational risk as a real failover, so drills get deferred, and recovery readiness ends up assumed rather than proven.
Recovery targets live in a document.

Recovery targets live in a document.

RPO and RTO are committed in a business-continuity plan, but whether the architecture actually meets them is rarely verified until production is already down.
What Tessell gives you

Resilience built in, and recovery you can prove on demand.

High availability and disaster recovery configured at provisioning, automated in operation, and testable without risking production. Here is what that looks like in practice.

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Disaster recovery you can test. Without risking production.

Graceful drill with consistency checkForceful failover for real incidents Automatic source rebuild after a real failover Switchback after a drill and after a rebuild · Drills run cross-region

A DR drill and a real failover are different operations on Tessell, and the platform keeps them apart. A drill runs a graceful switchover: every transaction is committed, the primary is demoted cleanly, and the DR instance is promoted only once full data consistency is confirmed. If it cannot be done safely, the drill stops rather than risk inconsistency. A real disaster runs a forceful promotion, after which Tessell automatically rebuilds the original primary so you can switch back once replication is re-established. Either way, switchback is available. That separation is what lets teams run DR drills as a routine operation, on a schedule, instead of treating recovery as a plan nobody has tested.

Fortune 500 US bank
Quarterly cross-region DR drills with seamless switchback and a validated 15-minute RPO, documented for regulators, across a five-node production cluster (primary, standby, and three cross-region DR nodes).
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RPO and RTO that hold up to an auditor.

PITR logs every 5 minutesRPO 0 achievable, synchronous Oracle RTO to 30 seconds Documented, repeatable drills

Recovery objectives are only as good as your ability to prove them. Tessell captures transaction logs every 5 minutes for point-in-time recovery, and with synchronous replication on Oracle, an RPO of zero and an RTO measured in seconds are achievable for the most critical workloads. Because drills are run and recorded on a schedule, the numbers in your business-continuity plan are tested numbers, not targets. That documentation is the same evidence your Security and Compliance reviews depend on.

Fortune 500 insurance firm
RPO 0 and RTO of 30 seconds for critical Oracle workloads, across a 33 data center migration.
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High availability built in. Failover automated.

Multi-AZ standbyAutomatic failover, 60-120s typicalOracle Data Guard, SQL Server Availability Groups, PostgreSQL streaming, MySQL group replicationManual switchover on demandAvailability Sets in non-AZ regions

Switch on Multi-AZ HA at provisioning and Tessell places a standby in a separate availability zone, kept in sync with the primary. When the platform detects a primary failure, planned or unplanned, it fails over to the standby automatically, typically in 60 to 120 seconds. Each engine uses its native replication, so resilience matches the way the database is built to run. In Azure regions without availability zones, Tessell uses Availability Sets to keep the primary and standby on separate fault domains

US state environmental agency
RTO reduced from 8 hours to automatic failover, and RPO from 3 hours to zero.
Operational Lifecycle Management

Business continuity is one part of the database lifecycle.

A database has to be provisioned, kept current, watched, and kept running when something goes wrong. Tessell manages the full operational lifecycle from one platform.

Provisioning

Every database, provisioned to the same standard, in minutes.

Multi-AZ HA is a toggle here, at provisioning time.

Explore Provisioning
Lifecycle Management Center

Keep every database current

The same switchover machinery that powers failover also keeps patching from meaning downtime.

Explore Lifecycle Management
Monitoring and Observability

Know what every database is doing.

Watch replica health and replication state alongside primary metrics.

Explore Monitoring
Get started

See what provable recovery looks like for your estate.

Walk through Multi-AZ HA, the DR drill and failover flows, and the documentation a drill produces with a Tessell engineer, using your engines, your cloud, and your recovery requirements.

Talk to a Tessell engineerRequest a DR readiness review
Frequently Asked
Questions
Each engine uses its native replication. Oracle runs on Data Guard, SQL Server on Availability Groups, PostgreSQL on streaming replication, and MySQL on group replication. In every case, Tessell provisions a Multi-AZ standby in a separate availability zone and handles automatic failover, so the resilience model matches how each engine is built to run.
Multi-AZ automatic failover typically completes in 60 to 120 seconds. Recovery can take longer if the primary had large uncommitted transactions that must be applied to the standby before promotion. A manual switchover is also available through the UI or API when you want a controlled failover with predictable timing, for maintenance or testing.
A drill is a graceful switchover. Transactions are committed, the primary is demoted cleanly, and the DR instance is promoted only after data consistency is confirmed; if it cannot be done safely, the drill stops. An actual recovery is a forceful promotion of the DR instance, after which Tessell automatically rebuilds the original primary. The drill is built for testing and compliance; the forceful path is for a real incident.
Yes. After a drill, you can switch back to the original primary once the drill completes. After a real failover, switchback becomes available once the original primary has been rebuilt and replication re-established. For PostgreSQL, the DR node is rebuilt to restore replication consistency after a forced failover.
Tessell captures transaction logs every 5 minutes for point-in-time recovery. With synchronous replication on Oracle, an RPO of zero and an RTO measured in seconds are achievable for the most critical workloads. Drill switchover timing depends on replication lag at the moment of the switchover.
Automated snapshots pause for the duration of the drill, while transaction-log capture continues from the new primary under your RPO policy, so point-in-time recovery is never interrupted. The service shows a DR-drill indicator throughout, and automated snapshots resume automatically once you switch back.
Because drills are run and recorded on a schedule, you get a continuous record of tested recovery: when the drill ran, the validated RPO and RTO, and the outcome. One Fortune 500 bank runs quarterly cross-region drills with a validated 15-minute RPO, producing exactly the documentation its regulators require, as a routine operation rather than a special project.
Tessell uses Azure Availability Sets automatically in those regions, placing the primary and standby on separate fault domains so a rack-level failure or maintenance event cannot take down both. DR instances are placed in their own Availability Set, and read replicas join the same set as the HA pair. No extra configuration is required.